Patent 9730443
Derivative works
Defensive disclosure: derivative variations of each claim designed to render future incremental improvements obvious or non-novel.
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Derivative works
Defensive disclosure: derivative variations of each claim designed to render future incremental improvements obvious or non-novel.
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Defensive Disclosure for US Patent 9,730,443
This document provides technical disclosures aimed at establishing prior art for derivative variations of the inventions claimed in US Patent 9,730,443, thereby rendering future incremental improvements by competitors obvious or non-novel. The derivations are based on the patent's core claims, exploring material substitutions, operational parameter expansions, cross-domain applications, integration with emerging technologies, and inverse/failure modes.
Independent Claim 1: Flowing Method for PAA Generation
Core Claim 1: A method for continuously or intermittently generating a non-equilibrium solution of peracetic acid (PAA) on-site for use as a disinfectant or sanitizer, comprising introducing a hydrogen peroxide-acetyl precursor solution to flowing water, mixing them, and then adding an aqueous source of an alkali metal or earth alkali metal hydroxide to form a reaction medium where PAA is generated within 30 seconds to five minutes.
1.1. Material & Component Substitution Derivatives
Derivative 1.1.1: Alternative Acetyl Precursor (Diacetin) and Alkali Source (Potassium Hydroxide)
- Enabling Description: A continuous on-site PAA generation system where the acetyl precursor solution consists of an approximately 30% aqueous solution of diacetin (glycerol diacetate) pre-mixed with 50% hydrogen peroxide at a molar ratio of H2O2:diacetin of approximately 6:1. This precursor solution is continuously injected into a flowing stream of deionized water using a peristaltic pump. Immediately downstream of a static helical mixer, a 45% aqueous potassium hydroxide solution is metered into the flowing mixture via a diaphragm pump. The flow rates are precisely controlled to achieve an initial pH of 12.5 in the reaction medium. The reaction medium is conveyed through a 1-meter section of PVDF piping, ensuring a residence time of approximately 45 seconds, within which a non-equilibrium PAA concentration of 1-3% is achieved. The PVDF piping ensures chemical compatibility and temperature resistance.
graph TD
A[Deionized Water Source] --> B{Flow Meter & Regulator}
B --> C[PVDF Pipe]
D[H2O2 (50%) & Diacetin (30% aq) Precursor Tank] --> E{Peristaltic Pump}
E --> F[Injection Quill 1]
F --> C
C --> G{Static Helical Mixer}
H[KOH (45% aq) Alkali Tank] --> I{Diaphragm Pump}
I --> J[Injection Quill 2]
J --> G
G --> K[PVDF Reaction Pipe (45s RT)]
K --> L{pH Sensor}
K --> M[PAA Product to Point-of-Use]
L --> N[Controller (optimizes KOH pump)]
Derivative 1.1.2: Advanced Mixing (Venturi Injector) and Ceramic-Lined Reactor
- Enabling Description: A continuous PAA generation method utilizing a hydrogen peroxide-triacetin solution (as per the patent's Example 1 formulation) delivered by a positive displacement pump. This solution is introduced into the throat of a Venturi injector where it rapidly entrains and mixes with the flowing raw process water. Immediately downstream of the Venturi, a 25% aqueous sodium carbonate solution, serving as the alkali source, is injected. The entire reaction takes place within a short section (0.5 meters) of ceramic-lined stainless steel pipe, ensuring high turbulence and chemical resistance. Reaction temperature is maintained within 20-25°C. PAA generation to a target concentration of 0.5-2% occurs within 20-40 seconds, measured by an in-line ORP sensor.
graph TD
A[Process Water Inlet] --> B{Venturi Injector}
C[H2O2-Triacetin Precursor] --> D{Positive Displacement Pump}
D --> B
E[Sodium Carbonate (25% aq) Tank] --> F{Metering Pump}
F --> G[Injection Point Post-Venturi]
G --> H[Ceramic-Lined SS Pipe Reactor]
H --> I{ORP Sensor}
H --> J[PAA Product Outlet]
I --> K[Controller (monitors reaction progress)]
Derivative 1.1.3: Quaternary Ammonium Hydroxide as Alkali with FEP Tubing
- Enabling Description: A flowing method for on-site PAA generation where a hydrogen peroxide-triacetin solution (mole ratio 3.8:1 H2O2:triacetin) is dosed into a potable water stream using a proportional injection pump. The mixture then passes through a series of FEP (fluorinated ethylene propylene) coiled tubing. A 10% solution of tetramethylammonium hydroxide (TMAH) in water is subsequently injected via a precision syringe pump into the FEP tubing immediately following the precursor injection point. The FEP tubing provides excellent chemical inertness and allows for visual inspection of the reaction. The total FEP tubing length is calculated to provide a 2-minute residence time, ensuring complete perhydrolysis. The PAA solution is generated with a pH of approximately 11.5-12.0 and is suitable for high-purity water systems.
sequenceDiagram
participant W as Potable Water Inlet
participant P as H2O2-Triacetin Pump
participant A as TMAH Pump
participant T as FEP Coiled Tubing
participant O as PAA Product Outlet
W->>P: Flowing Water
P->>T: H2O2-Triacetin Solution
A->>T: TMAH Solution (immediately after P)
T-->>O: Reaction Medium (2 min residence)
Note over T: Perhydrolysis occurs
O->>W: PAA product to use
1.2. Operational Parameter Expansion Derivatives
Derivative 1.2.1: Microfluidic Reactor for Precision PAA Generation
- Enabling Description: A microfluidic system for continuous, on-demand PAA generation, producing volumes in the microliter to milliliter per minute range. The hydrogen peroxide-triacetin precursor solution (as per Claim 15) and an alkaline buffer solution (e.g., 1M sodium phosphate, pH 13) are delivered by syringe pumps into separate inlets of a glass microfluidic chip with serpentine mixing channels. The channel dimensions are optimized for rapid laminar flow mixing and reaction kinetics, achieving PAA generation within 5-15 seconds due to high surface-area-to-volume ratios. This system is designed for applications requiring extremely precise, low-volume PAA doses, such as in laboratory assays or specialized component cleaning. Temperature control via an integrated Peltier element maintains reaction temperature at 30°C.
graph LR
H[H2O2-Triacetin Precursor] --> S1{Syringe Pump 1}
A[Alkaline Buffer (pH 13)] --> S2{Syringe Pump 2}
S1 --> M(Microfluidic Mixer Chip)
S2 --> M
M --> P{Peltier Element}
P --> O[Micro PAA Outlet]
M -- Reaction (5-15s) --> O
Derivative 1.2.2: Large-Scale Municipal Wastewater Disinfection (10,000+ GPM)
- Enabling Description: A large-scale system for continuous PAA generation to disinfect municipal wastewater at flow rates exceeding 10,000 gallons per minute. Concentrated (35%) hydrogen peroxide and industrial-grade triacetin are separately metered, blended in-line to form the precursor solution (H2O2:triacetin mole ratio of 4:1), and then injected into a high-volume pipe network carrying secondary-treated wastewater. High-capacity impeller mixers are strategically placed to ensure thorough initial mixing. Immediately thereafter, bulk 50% sodium hydroxide solution is rapidly injected through multiple distributed injection points around the pipe circumference. The subsequent reaction occurs within a 50-meter concrete flume, designed for a minimum 2-minute residence time. Real-time PAA and ORP sensors along the flume provide feedback to a central control system for dynamic adjustment of precursor and alkali dosing.
graph TD
W[Wastewater Inlet (10k+ GPM)] --> C1[Concrete Flume]
H[H2O2 (35%) Storage] --> M1(Precursor Blender)
T[Industrial Triacetin Storage] --> M1
M1 --> P1{Injection Pumps}
P1 --> C1
N[NaOH (50%) Bulk Storage] --> P2{Distributed Injection Pumps}
P2 --> C1
C1 --> R[Impeller Mixers]
R --> S1{PAA Sensor 1}
S1 --> C2[50m Reaction Flume]
C2 --> S2{ORP Sensor 2}
S2 --> O[Disinfected Effluent Outlet]
S1 & S2 --> CL[Central Control Logic]
CL --> P1 & P2
Derivative 1.2.3: High-Temperature, Short-Contact PAA for Aseptic Processing
- Enabling Description: An on-site PAA generation system designed for high-temperature, short-contact sanitization in aseptic processing lines. A hydrogen peroxide-triacetin solution (H2O2:triacetin mole ratio 3.2:1) is pre-heated to 60°C and then injected into a rapidly flowing (2 m/s) water stream that has also been pre-heated to 85°C. Downstream, a 30% potassium carbonate solution, also pre-heated to 60°C, is injected via a rapid-response solenoid valve. The reaction occurs in a compact, jacketed stainless steel tubular reactor with high-shear mixing elements. PAA generation to a concentration of 0.2-0.5% is achieved within 15-25 seconds, with the effluent immediately cooled to 40°C using a plate heat exchanger to prevent PAA degradation. This rapid cycle minimizes exposure time and maximizes sanitizing power.
sequenceDiagram
participant W as Hot Water Supply (85°C)
participant H as H2O2-Triacetin Precursor (60°C)
participant A as K2CO3 Alkali (60°C)
participant R as Jacketed SS Tubular Reactor
participant C as Plate Heat Exchanger
participant P as PAA Product (40°C)
W->>R: Flowing Hot Water
H->>R: Inject Pre-heated Precursor
A->>R: Inject Pre-heated Alkali
Note over R: Rapid High-Shear Mixing & Reaction (15-25s)
R->>C: Hot PAA Solution
C->>P: Cooled PAA Solution
1.3. Cross-Domain Application Derivatives
Derivative 1.3.1: Aerospace - Sterilization of Spacecraft Life Support Systems
- Enabling Description: A compact, in-situ PAA generation system for sterilizing closed-loop environmental control and life support systems (ECLSS) on long-duration spacecraft. A hydrogen peroxide-triacetin solution is stored in a sealed, pressurized reservoir. On command, a micro-dosing pump injects this precursor into a recirculating water line within the ECLSS. Simultaneously, a metered dose of lithium hydroxide solution (selected for its low atomic mass and compatibility with closed systems) is introduced. The reaction occurs within a biocompatible, inert polymer tubing (e.g., PEEK) section, producing PAA at concentrations of 100-500 ppm for biofilm control. The system operates intermittently, triggered by sensor readings indicating microbial growth or scheduled maintenance cycles. Post-treatment, residual PAA is quenched using an onboard UV-C light reactor.
graph TD
A[ECLSS Water Recirculation] --> B{Micro-Dosing Pump}
C[H2O2-Triacetin Reservoir] --> B
D[LiOH Solution Reservoir] --> E{Metering Pump}
E --> F[Injection Point 2]
B --> G[PEEK Reaction Tubing]
F --> G
G --> H{PAA Sensor}
H --> I[UV-C Quench Reactor]
I --> J[Sterile Water Back to ECLSS]
H --> K[ECLSS Control System]
K --> B & E
Derivative 1.3.2: AgTech - Irrigation System Biocide for Hydroponics
- Enabling Description: An on-demand PAA generation system integrated into a hydroponic farm's irrigation manifold. A low-concentration (15%) hydrogen peroxide solution is continuously mixed with diacetin at a 5:1 molar ratio to form the precursor. This is then injected into the main nutrient solution delivery line. Immediately after a static mixer, a food-grade calcium hydroxide slurry is injected to raise the pH and initiate PAA formation. The PAA solution (target 5-10 ppm) then flows through the irrigation lines to prevent algal growth and pathogen contamination in plant root zones. The system operates continuously during irrigation cycles, with flow rates automatically adjusted based on nutrient demand and real-time ORP measurements in the root zone return lines.
graph LR
N[Nutrient Solution Supply] --> M1(Main Manifold)
H[H2O2 (15%) Storage] --> P1{Precursor Mixer}
D[Diacetin Storage] --> P1
P1 --> I1{Injection Pump 1}
I1 --> M1
M1 --> S(Static Mixer)
C[Ca(OH)2 Slurry Storage] --> I2{Injection Pump 2}
I2 --> S
S --> R[Irrigation Lines to Plants]
R --> O[Return Line ORP Sensor]
O --> Cntrl[Control System]
Cntrl --> I1 & I2
Derivative 1.3.3: Consumer Electronics Manufacturing - Cleanroom Equipment Sterilization
- Enabling Description: A specialized on-site PAA generation unit for the disinfection of robotic arms and surface areas within ISO Class 1 cleanrooms for semiconductor manufacturing. A high-purity hydrogen peroxide-triacetin solution (mole ratio 7:1) is housed in a dedicated cleanroom-compatible container. This solution is introduced into an ultra-pure water (UPW) stream via a precision syringe pump. Following a micro-channel static mixer, a precisely metered, aerosolized solution of high-purity sodium bicarbonate (as the alkali) is injected to initiate PAA formation. The resulting PAA mist (50-200 ppm) is then delivered through a controlled nozzle system to sterilize surfaces, ensuring no residue and minimal downtime. The entire process is executed under inert nitrogen atmosphere to prevent oxidation and contamination.
graph TD
UPW[Ultra-Pure Water Supply] --> F[Flow Controller]
HPT[H2O2-Triacetin Solution] --> SP{Syringe Pump}
F --> SM(Micro-Channel Static Mixer)
SP --> SM
NaB[Sodium Bicarbonate (Aerosolized)] --> AP{Aerosol Pump}
AP --> SM
SM --> NS[Nozzle System (N2 purge)]
NS --> CR[Cleanroom Robotic Arm/Surfaces]
NS --> OS{PAA Sensor (Cleanroom)}
OS --> C[Cleanroom Control System]
1.4. Integration with Emerging Tech Derivatives
Derivative 1.4.1: AI-Driven Optimization for Adaptive PAA Dosing
- Enabling Description: An on-site PAA generation system (using H2O2-triacetin and NaOH) where a machine learning (ML) model continuously optimizes precursor and alkali dosing rates. Real-time data from multiple in-line sensors (PAA concentration, H2O2 residual, pH, ORP, water flow rate, water temperature, incoming microbial load data from rapid assays) is fed to the ML model. The AI analyzes historical performance, predicts demand fluctuations, and proactively adjusts pump speeds to maintain optimal PAA concentration for disinfection while minimizing precursor consumption. The AI also identifies and compensates for varying water quality or aging of components, ensuring consistent PAA efficacy within the 30-second to 5-minute generation window.
graph TD
I[Inlet Water] --> FM{Flow Meter}
HPA[H2O2-Triacetin Precursor] --> PP1{Precursor Pump}
NaOH[Alkali Solution] --> PP2{Alkali Pump}
FM --> M(Mixer & Reactor)
PP1 --> M
PP2 --> M
M --> PAA_S{PAA Sensor}
M --> H2O2_S{H2O2 Sensor}
M --> PH_S{pH Sensor}
M --> ORP_S{ORP Sensor}
M --> TEMP_S{Temp Sensor}
MIC_D[Microbial Load Data] --> AI[AI Optimization Engine]
PAA_S --> AI
H2O2_S --> AI
PH_S --> AI
ORP_S --> AI
TEMP_S --> AI
FM --> AI
AI --> PP1
AI --> PP2
M --> O[PAA Product Outlet]
Derivative 1.4.2: IoT Sensor Network for Predictive Maintenance and Remote Monitoring
- Enabling Description: A distributed, IoT-enabled PAA generation system where individual precursor containers, alkali tanks, injection pumps, static mixers, and reaction zones are equipped with wireless IoT sensors. These sensors monitor liquid levels, flow rates, pump motor diagnostics (vibration, temperature), pH, PAA concentration, H2O2 concentration, and ambient temperature. Data is transmitted via a secure LoRaWAN network to a cloud-based platform. This platform provides real-time dashboards for remote monitoring, generates alerts for critical parameters, and employs algorithms for predictive maintenance on pumps and sensors, ensuring continuous uptime and optimized inventory management for the H2O2-triacetin precursor and NaOH.
graph TD
subgraph IoT Devices
P1[Precursor Tank Level Sensor] -- LoRaWAN --> GW(Gateway)
P2[Alkali Tank Level Sensor] -- LoRaWAN --> GW
P3[Precursor Pump Diagnostic] -- LoRaWAN --> GW
P4[Alkali Pump Diagnostic] -- LoRaWAN --> GW
P5[Inline PAA Sensor] -- LoRaWAN --> GW
P6[Inline pH Sensor] -- LoRaWAN --> GW
P7[Flow Meter Sensor] -- LoRaWAN --> GW
end
GW --> Cloud[Cloud Platform (AWS IoT/Azure IoT)]
Cloud --> DB(Time-Series Database)
DB --> DASH[Dashboard & Alerts]
DASH --> USER[Operators/Maintenance]
DB --> PM[Predictive Maintenance Module]
PM --> ALERT[Maintenance Alerts]
Derivative 1.4.3: Blockchain for Supply Chain & PAA Efficacy Verification
- Enabling Description: An on-site PAA generation system integrated with a blockchain-based immutable ledger for end-to-end supply chain verification and PAA efficacy tracking. Each batch of hydrogen peroxide and triacetin precursor, along with the alkali (NaOH), is tagged with a unique cryptographic identifier at manufacturing. Upon arrival at the point-of-use, digital certificates are verified on the blockchain. During PAA generation, critical parameters (precursor/alkali batch IDs, exact dosing ratios, reaction times, final PAA concentration, pH, and ORP readings from calibrated sensors) are automatically recorded as hashed transactions on a private blockchain. This ensures a tamper-proof audit trail for regulatory compliance, product authenticity, and verifiable disinfection efficacy for sensitive applications (e.g., pharmaceutical clean-in-place).
sequenceDiagram
participant MFG as Manufacturer (H2O2, Triacetin, NaOH)
participant WH as Warehouse
participant OU as On-site PAA Unit
participant BC as Blockchain Ledger
MFG->>WH: Ship Precursor/Alkali (Batch IDs)
Note over MFG: Cryptographically hash batch data
WH->>OU: Deliver Precursor/Alkali
OU->>BC: Verify Batch IDs (Smart Contract)
OU->>OU: Start PAA Generation
Note over OU: Capture Dosing, Temp, pH, PAA, ORP
OU->>BC: Record Generation Event (Hashed Transaction)
BC->>OU: Confirm Transaction
OU->>OU: PAA Delivered to Point-of-Use
BC->>Auditor: Immutable Audit Trail
1.5. The "Inverse" or Failure Mode Derivatives
Derivative 1.5.1: Fail-Safe Dilution and Quench System
- Enabling Description: An on-site PAA generation system incorporating an emergency fail-safe mechanism. If any critical parameter deviates from safe operating limits (e.g., PAA concentration >5% due to dosing error, H2O2 residual >10%, pH <10.0, or main water flow interruption), a safety interlock system is activated. This system automatically shuts off precursor and alkali pumps, opens a high-flow diluent water valve, and simultaneously injects a pre-measured quantity of sodium thiosulfate solution (a PAA and H2O2 quencher) into the reaction medium. This rapidly dilutes and neutralizes the PAA, preventing uncontrolled reaction or delivery of an out-of-spec or hazardous solution to the point-of-use, effectively stopping the process and purging the lines.
stateDiagram
[*] --> Standby
Standby --> Generating: Start Command
Generating --> Safe_Limit_Violation: PAA_Sensor > 5% or H2O2_Sensor > 10% or pH < 10.0 or Flow_Loss
Generating --> Emergency_Quench: Safety Interlock Triggered
Safe_Limit_Violation --> Emergency_Quench: Initiates Quench Sequence
Emergency_Quench --> Diluting_Neutralizing: Actuate Dilution & Quench Pumps
Diluting_Neutralizing --> Standby: System Safe / Manual Reset
Emergency_Quench --> Fail_State: Quench System Failure
Fail_State --> [*]
Derivative 1.5.2: Low-Power/Prophylactic PAA Generation Mode
- Enabling Description: An on-site PAA generation system featuring a "Low-Power Mode" for periods of reduced demand or prophylactic treatment. In this mode, the controller significantly reduces the flow rates of both the hydrogen peroxide-triacetin precursor and the alkali solution by 80-95% compared to full operational mode. This results in the generation of a much lower concentration PAA solution (e.g., 10-50 ppm PAA, compared to normal 1-3%) with extended reaction times (e.g., 5-10 minutes). This mode conserves expensive precursors, extends equipment lifespan by reducing wear on pumps, and provides continuous, low-level disinfection to prevent biofilm formation during idle periods, without the need for a full shutdown and restart.
graph TD
A[Start Command] --> B{Demand Sensor / Schedule}
B -- High Demand --> C[Full Power Mode]
B -- Low Demand / Prophylactic --> D[Low Power Mode]
C --> P1(Full Flow H2O2-Triacetin)
C --> P2(Full Flow Alkali)
D --> P3(Reduced Flow H2O2-Triacetin)
D --> P4(Reduced Flow Alkali)
P1 & P2 --> R1[High PAA Generation]
P3 & P4 --> R2[Low PAA Generation (Prophylactic)]
R1 --> U1[High Disinfection Use]
R2 --> U2[Low-Level Disinfection Use]
Derivative 1.5.3: Fault-Tolerant Bypass and Alert System
- Enabling Description: A PAA generation system designed with a redundant bypass loop for fault tolerance. If any critical component in the PAA generation train (e.g., precursor pump failure, static mixer blockage, pH probe malfunction indicating incorrect alkalinity) is detected by diagnostic sensors, the system automatically activates a solenoid valve to divert the untreated water stream around the PAA generation components. Concurrently, an audible alarm, visual alert, and remote notification (e.g., SMS, email) are triggered to alert operators of the fault condition. This ensures continuous water flow to the point-of-use (albeit without PAA treatment) and prevents potential damage from malfunctioning equipment or delivery of an improperly treated solution, until maintenance can be performed.
graph LR
A[Inlet Water] --> B{Solenoid Valve (Normal: Gen)}
B -- Normal Operation --> C[H2O2-Triacetin Injection]
C --> D[Alkali Injection]
D --> E[Mixing & Reaction]
E --> F[PAA Outlet]
B -- Fault Detected --> G[Bypass Line]
G --> F
C -- Fault --> H[Diagnostic System]
D -- Fault --> H
E -- Fault --> H
H --> I[Alarm System]
I --> J[Remote Notification]
H --> B(Activate Bypass)
Independent Claim 8: Batch Method for PAA Generation
Core Claim 8: A method for continuously or intermittently generating a non-equilibrium solution of PAA on-site in a batch process, comprising providing a container of water, introducing a hydrogen peroxide-acetyl precursor solution to the water, mixing them, and then adding an aqueous source of an alkali metal or earth alkali metal hydroxide to form a reaction medium where PAA is generated within 30 seconds to five minutes, and the PAA solution has a pH of about 11.2 to about 13.37.
2.1. Material & Component Substitution Derivatives
Derivative 2.1.1: Alternative Acetyl Precursor (Diacetin) and Alkali (Calcium Hydroxide Slurry)
- Enabling Description: A batch PAA generation process using a 500-liter jacketed stainless steel mixing tank. Softened water is first added to the tank. Then, a hydrogen peroxide-diacetin precursor solution (40% H2O2, 30% diacetin, 30% water, mole ratio H2O2:diacetin approx. 4.5:1) is pumped into the tank and agitated by a high-shear submersible mixer for 30 seconds. Subsequently, a 10% aqueous calcium hydroxide slurry is slowly metered into the vigorously stirred mixture until the pH reaches 12.8. PAA generation, reaching a concentration of 2-4%, is observed within 2 minutes of alkali addition. The jacketed tank allows for temperature control (e.g., maintaining 25°C) to manage the exothermic reaction.
graph TD
A[Softened Water Inlet] --> B[Jacketed SS Mixing Tank]
C[H2O2-Diacetin Precursor Tank] --> D{Pump 1}
D --> B
E[Ca(OH)2 Slurry Tank] --> F{Pump 2}
F --> B
B --> G{High-Shear Submersible Mixer}
G --> H{pH Probe}
G --> I{PAA Sensor}
B --> J[PAA Batch to Point-of-Use]
H --> K[Controller (controls Pump 2)]
Derivative 2.1.2: Stabilized Precursor (HEDP Trace) and Carbonate/Bicarbonate Buffer
- Enabling Description: A batch method employing a hydrogen peroxide-triacetin precursor solution (as per Claim 15) that additionally contains a trace amount (e.g., 50 ppm) of hydroxyethylidene diphosphonic acid (HEDP) as a stability enhancer during storage. This precursor is added to a batch tank filled with process water and mixed. Instead of a single strong alkali, a pre-calculated mixture of sodium carbonate and sodium bicarbonate is added as a solid blend to achieve a final buffered pH of 11.5-12.0. This buffering system provides more stable pH control, preventing spikes in alkalinity and prolonging optimal reaction conditions. PAA generation is complete within 3-5 minutes, producing a solution of 1-5% PAA.
graph TD
A[Process Water Container] --> B{Agitator}
C[H2O2-Triacetin (HEDP) Precursor] --> D{Pump}
D --> A
E[Solid Na2CO3/NaHCO3 Blend] --> F{Feeder}
F --> A
A --> G{pH Probe}
G --> H[Controller (monitors pH)]
H --> I[PAA Solution to Use]
2.2. Operational Parameter Expansion Derivatives
Derivative 2.2.1: Micro-Batch Generation in Disposable Cartridges
- Enabling Description: A "micro-batch" PAA generation system for highly localized or sterile applications. Small, pre-filled disposable cartridges contain precisely measured aliquots of hydrogen peroxide-triacetin precursor (e.g., 10 mL of solution from Claim 15). These cartridges are inserted into a portable, automated dispenser. The dispenser draws a fixed volume of sterile water (e.g., 90 mL) into a mixing chamber within the cartridge, followed by a precise injection of concentrated sodium hydroxide solution (e.g., 10% NaOH). Rapid ultrasonic mixing within the cartridge chamber initiates PAA formation. A 100 mL batch of 0.5-1.5% PAA solution is generated within 30 seconds, immediately ready for point-of-use application without the need for large tanks or complex plumbing.
sequenceDiagram
participant C as Disposable Cartridge
participant D as Automated Dispenser
participant W as Sterile Water Source
participant A as NaOH Concentrate
D->>C: Insert Cartridge
W->>C: Fill Mixing Chamber (90 mL)
A->>C: Inject NaOH (precise volume)
Note over C: Ultrasonic Mixing (30s)
C->>D: Eject PAA Solution
D->>D: Dispense PAA to Point-of-Use
Derivative 2.2.2: Extreme Temperature Batch (Cryogenic Pre-cooling)
- Enabling Description: A batch PAA generation method designed for applications requiring extremely cold water processing. A 1000-liter jacketed mixing tank is pre-cooled to 0°C. Deionized water, pre-chilled to 0°C, is added to the tank. The hydrogen peroxide-triacetin precursor solution (as per Claim 15) is then introduced, followed by 50% sodium hydroxide solution, with both additions occurring while maintaining the 0°C temperature. Due to the reduced kinetics at cryogenic temperatures, the mixing and reaction time is extended to 10 minutes to ensure optimal PAA generation (target 0.5-1% PAA). The chilling system maintains the temperature during the entire reaction period, minimizing PAA degradation from heat. The pH range of 11.2-13.37 is still maintained.
graph TD
W[Chilled Deionized Water (0°C)] --> T[Jacketed Mixing Tank]
T --> J(Jacketed Cooling System)
HPA[H2O2-Triacetin Precursor] --> P1{Pump 1}
P1 --> T
NAOH[50% NaOH] --> P2{Pump 2}
P2 --> T
T --> M{Agitator}
M --> S{PAA Sensor}
S --> C[Controller]
C --> J(Maintain 0°C)
T --> O[Chilled PAA Batch (10 min RT)]
2.3. Cross-Domain Application Derivatives
Derivative 2.3.1: Pharmaceutical Manufacturing - Bioreactor Clean-in-Place (CIP)
- Enabling Description: A batch PAA generation process specifically designed for the Clean-in-Place (CIP) cycle of pharmaceutical bioreactors. A dedicated mixing vessel, sterile-validated, is charged with USP-grade water. A pre-sterilized hydrogen peroxide-triacetin solution (H2O2:triacetin 3.8:1) is transferred to this vessel via aseptic transfer lines. After mixing, a sterile-filtered 45% potassium hydroxide solution is added to initiate PAA generation, achieving a pH of 12.0-12.5. The 1-2% PAA solution is then immediately pumped into the bioreactor CIP circuit. The generation-to-use time is tightly controlled within 90 seconds to maximize the active PAA concentration for effective bioburden reduction. All components and processes adhere to cGMP standards.
sequenceDiagram
participant SV as Sterile Mixing Vessel
participant USP as USP Water Supply
participant HPT as Pre-sterilized H2O2-Triacetin
participant KOH as Sterile KOH (45%)
participant BR as Bioreactor CIP Circuit
USP->>SV: Fill USP Water
HPT->>SV: Aseptic Transfer H2O2-Triacetin
SV->>SV: Mix (Agitator)
KOH->>SV: Add Sterile KOH
Note over SV: PAA Generation (pH 12.0-12.5, <90s)
SV->>BR: Pump PAA Solution to Bioreactor CIP
Derivative 2.3.2: Art Restoration - Gentle Bleaching of Paper Artifacts
- Enabling Description: A precisely controlled micro-batch PAA generation method for the gentle bleaching and disinfection of delicate paper artifacts during restoration. A small glass vessel serves as the batch container. Distilled water is added, followed by a dilute hydrogen peroxide-diacetin precursor solution (e.g., 5% H2O2, 2% diacetin). The mixture is gently stirred. A very dilute (0.5%) sodium bicarbonate solution is then carefully added dropwise to achieve a final pH of 11.2, initiating a slow PAA generation. The reaction is allowed to proceed for 5 minutes, producing PAA at concentrations of 50-100 ppm. This low concentration and controlled pH prevent damage to delicate cellulose fibers, offering a safe, on-demand bleaching agent for historical documents.
graph TD
W[Distilled Water] --> GV[Glass Vessel]
DHP[Dilute H2O2-Diacetin Precursor] --> P1{Micro-Pump 1}
P1 --> GV
GV --> S(Gentle Magnetic Stirrer)
DSB[Dilute NaHCO3 Solution] --> P2{Micro-Pump 2 (Dropwise)}
P2 --> GV
GV --> PH[pH Meter]
PH --> O[PAA Solution for Art Restoration]
PH --> C[Control System (maintains pH 11.2)]
Derivative 2.3.3: Veterinary Science - Disinfection of Surgical Tools
- Enabling Description: An on-site PAA generation system for batch disinfection of veterinary surgical tools. A dedicated immersion tank, constructed from medical-grade polypropylene, is filled with softened water. A hydrogen peroxide-triacetin solution (H2O2:triacetin 4:1) is then dispensed into the tank. Following a brief mixing period (30 seconds) using a magnetic stir bar, an aqueous sodium hydroxide solution is added until the pH reaches 12.0. Surgical instruments are then immersed in the freshly generated 0.5-1% PAA solution for a specified contact time (e.g., 2 minutes). The process is automated to ensure consistent PAA concentration and pH within the claimed ranges (pH 11.2-13.37), maximizing germicidal efficacy.
sequenceDiagram
participant IT as Immersion Tank (Polypropylene)
participant SW as Softened Water
participant HPT as H2O2-Triacetin Precursor
participant NaOH as NaOH Solution
participant ST as Surgical Tools
SW->>IT: Fill Softened Water
HPT->>IT: Dispense Precursor
IT->>IT: Mix (30s)
NaOH->>IT: Add NaOH (to pH 12.0)
Note over IT: PAA Generation (0.5-1% PAA)
ST->>IT: Immerse Surgical Tools (2 min contact)
IT->>IT: Drain PAA
2.4. Integration with Emerging Tech Derivatives
Derivative 2.4.1: AI-Driven Batch Process Optimization with Digital Twin
- Enabling Description: A batch PAA generation system where an AI-driven digital twin monitors and optimizes the reaction kinetics. A physical batch reactor (mixing tank) is equipped with a suite of real-time sensors (PAA, H2O2, pH, temperature, stirrer RPM, conductivity). This sensor data feeds into a computational "digital twin" of the reactor, running a kinetic model of the perhydrolysis reaction. The AI continuously adjusts the alkali dosing rate and mixing intensity to achieve a target PAA concentration and optimal precursor conversion within 30 seconds to five minutes, while minimizing H2O2 residual and ensuring the final pH is within 11.2-13.37. The digital twin can also simulate "what-if" scenarios for fault prediction and process improvement.
graph TD
R[Physical Batch Reactor] --> S{Sensors (PAA, H2O2, pH, Temp, RPM, Cond)}
S --> DT[Digital Twin (Kinetic Model)]
DT --> AI[AI Optimization Engine]
AI --> C[Controller]
C --> R(Alkali Pump, Stirrer)
R --> O[PAA Batch Output]
AI -- Predictive Maintenance --> M[Maintenance Alerts]
Derivative 2.4.2: Robotic Dispensing for Hazardous Precursors
- Enabling Description: A fully automated batch PAA generation system utilizing robotic dispensing for enhanced safety and precision, particularly for high-concentration or hazardous precursors. A robotic arm precisely dispenses measured volumes of hydrogen peroxide (e.g., 70% H2O2) and pure triacetin (as individual components, rather than pre-mixed) into a sealed, inert batch reactor containing deoxygenated water. Subsequently, the robot dispenses a highly concentrated (75%) potassium hydroxide solution. The robotic system ensures accurate volumetric control, minimizes human exposure to corrosive chemicals, and maintains a sterile environment for specialized applications. The reaction proceeds to yield 3-7% PAA at a pH of 11.2-13.37 within the typical 30-second to five-minute window, under continuous robotic monitoring of key parameters.
sequenceDiagram
participant R as Robotic Arm
participant H as H2O2 (70%) Source
participant T as Pure Triacetin Source
participant K as KOH (75%) Source
participant B as Sealed Batch Reactor
participant W as Deoxygenated Water
participant C as Control System
C->>R: Initiate Batch
R->>W: Dispense H2O2 into B
R->>W: Dispense Triacetin into B
Note over B: Mix (Integrated Stirrer)
R->>W: Dispense KOH into B
Note over B: PAA Generation (30s-5min, pH 11.2-13.37)
C->>B: Monitor Reaction Parameters
B->>B: Dispense PAA Batch
2.5. The "Inverse" or Failure Mode Derivatives
Derivative 2.5.1: Automated Batch Overflow Prevention and Emergency Venting
- Enabling Description: A batch PAA generation system equipped with a multi-level ultrasonic level sensor and an emergency venting system. If the water or precursor additions cause the liquid level in the batch tank to exceed a predefined safe limit, the system immediately halts all incoming liquid flows. In case of an unexpected exothermic runaway reaction leading to rapid gas evolution and dangerous pressure build-up, a pressure transducer triggers an emergency relief valve, venting non-condensable gases (primarily O2 from H2O2 decomposition) through a scrubber system. This prevents tank over-pressurization and potential rupture, ensuring a safe failure mode while maintaining the pH within the claimed range during normal operation.
stateDiagram
[*] --> Idle
Idle --> Filling: Start Batch
Filling --> Mixing_Precursors: Water + H2O2-Triacetin Added
Mixing_Precursors --> Adding_Alkali: Alkali Added
Adding_Alkali --> Reacting: PAA Generation
Reacting --> Batch_Complete: Target PAA/Time Reached
Batch_Complete --> Idle
Filling --> Overflow_Detected: Level Sensor High
Mixing_Precursors --> Overflow_Detected
Adding_Alkali --> Overflow_Detected
Reacting --> Pressure_Exceeded: Pressure Sensor High
Overflow_Detected --> Halt_Inlets: Stop Pumps
Pressure_Exceeded --> Emergency_Venting: Activate Relief Valve
Emergency_Venting --> Scrubbing: Direct Vented Gas to Scrubber
Halt_Inlets --> Safe_State_Warning: Operator Alert
Emergency_Venting --> Safe_State_Warning: Operator Alert
Derivative 2.5.2: Controlled Degradation for Residual PAA Neutralization
- Enabling Description: A batch PAA generation system with an integrated post-generation neutralization cycle. After the desired PAA concentration has been achieved and dispensed, any residual PAA remaining in the mixing tank or lines is actively degraded. This is achieved by introducing a precise amount of a reducing agent (e.g., sodium metabisulfite solution) into the batch tank. This rapidly deactivates any leftover PAA and unreacted hydrogen peroxide, yielding harmless byproducts. The system monitors the ORP until a safe, near-zero oxidant level is confirmed before draining the tank, preventing accidental exposure to PAA or H2O2 during cleaning or maintenance. The original batch still adheres to pH 11.2-13.37.
graph TD
A[PAA Batch Ready] --> B{PAA Dispensed}
B --> C[Residual PAA in Tank]
C --> D{Reducing Agent (Na2S2O5) Injection}
D --> E[Mix & React]
E --> F{ORP Sensor}
F -- Oxidant Present --> E
F -- Oxidant Absent --> G[Neutralized Effluent Drain]
Independent Claim 15: Liquid Composition for PAA Generation
Core Claim 15: A liquid composition for generating non-equilibrium solutions of PAA on-site, comprising about 23% to about 40% aqueous hydrogen peroxide, about 20% to about 52% triacetin, and water, wherein a trace amount of PAA is formed within the first day of preparation, and the mole ratio of hydrogen peroxide:triacetin is about 2.98:1 to about 12.84:1, and the pH is about 1.46 to about 2.2.
3.1. Material & Component Substitution Derivatives
Derivative 3.1.1: Diacetin as Acetyl Precursor with Glycerol Co-solvent
- Enabling Description: A stable liquid precursor composition for on-site PAA generation, comprising approximately 35% aqueous hydrogen peroxide, 35% diacetin (glycerol diacetate), 10% glycerol (as a solubility enhancer and humectant), and 20% water. This composition maintains a mole ratio of hydrogen peroxide:diacetin of approximately 5:1. The pH of this formulation is between 1.8 and 2.0. A trace amount of PAA is formed within the first 24 hours of preparation (e.g., <0.05%), demonstrating its stability for storage and transport. The addition of glycerol further improves solubility and potentially reduces freezing point for cold storage applications.
classDiagram
class LiquidComposition {
+HydrogenPeroxide: 35% (aq)
+Diacetin: 35%
+Glycerol: 10%
+Water: 20%
+H2O2_Diacetin_MoleRatio: ~5:1
+pH: 1.8-2.0
+TracePAA_Day1: <0.05%
}
Derivative 3.1.2: Ethyl Acetate (Co-soluble) and Low-Concentration H2O2
- Enabling Description: A liquid precursor composition formulated for rapid evaporation and minimal residue, consisting of approximately 25% hydrogen peroxide solution (from a 35% H2O2 stock), 30% ethyl acetate (partially co-soluble, with a small amount of an ethoxylated alcohol non-ionic surfactant, 1%, to maintain homogeneity), and 44% water. The mole ratio of hydrogen peroxide:ethyl acetate is approximately 1.5:1. The pH is adjusted to be between 1.5 and 2.2 with phosphoric acid. This composition forms only a trace amount of PAA (<0.01%) within the first day and is intended for applications where low flash point organic components are permissible, offering a different kinetic profile for perhydrolysis compared to triacetin due to the single acetyl group.
graph LR
H2O2_35[35% H2O2 Stock] --> C1(25% H2O2 Aqueous)
EA[Ethyl Acetate] --> C2(30% Ethyl Acetate)
SURF[Ethoxylated Alcohol Surfactant (1%)] --> C2
W[Water] --> C3(44% Water)
PA[Phosphoric Acid] --> C4(pH Adj. 1.5-2.2)
C1 & C2 & C3 & C4 --> LC[Liquid Composition]
LC -- Properties --> R1(H2O2:EA ~1.5:1)
LC -- Properties --> R2(Trace PAA Day1 <0.01%)
Derivative 3.1.3: Acetylated Starch (Solubilized) with Enhanced H2O2 Stability
- Enabling Description: A stable liquid composition comprising 28% aqueous hydrogen peroxide (from 50% H2O2), 25% pre-solubilized acetylated starch (e.g., hydroxypropyl distarch acetate, 15% solution in propylene glycol monoethyl ether), and 47% water. This formulation uses a more complex acetyl precursor where the acetyl groups are sterically hindered yet accessible. A minor stabilizer system (e.g., 100 ppm dipicolinic acid) is incorporated to maintain hydrogen peroxide stability. The pH of the composition is approximately 1.9. The mole ratio of H2O2 to acetyl groups (calculated as total acetyl content from acetylated starch) is approximately 8:1. Trace PAA formation is maintained below 0.02% in 24 hours.
classDiagram
class LiquidComposition {
+HydrogenPeroxide: 28% (aq)
+AcetylatedStarchSolution: 25% (in PGMEE)
+Water: 47%
+DipicolinicAcid: 100 ppm
+pH: ~1.9
+H2O2_AcetylGroup_MoleRatio: ~8:1
+TracePAA_Day1: <0.02%
}
3.2. Operational Parameter Expansion Derivatives
Derivative 3.2.1: Super-Concentrated Precursor for Reduced Shipping Volume
- Enabling Description: A super-concentrated liquid precursor composition designed to minimize transportation costs and storage footprint. It consists of 45% hydrogen peroxide (from 70% H2O2 stock), 58% triacetin, and a balance of water (e.g., 7%). This composition features a hydrogen peroxide:triacetin mole ratio of approximately 1:1, maximizing the acetyl precursor density. Due to its high concentration, it requires specialized, temperature-controlled (e.g., 15-20°C) and pressure-rated containers for transport. The pH is approximately 1.0-1.5, ensuring minimal PAA formation (<0.005%) within the first 24 hours, but requiring careful dilution and activation at the point-of-use.
graph TD
H2O2_70[70% H2O2 Stock] --> HC1(45% H2O2)
TA[Pure Triacetin] --> HC2(58% Triacetin)
W[Water] --> HC3(7% Water)
HC1 & HC2 & HC3 --> SCC[Super-Concentrated Composition]
SCC -- Properties --> MR(H2O2:Triacetin ~1:1)
SCC -- Properties --> pH(pH 1.0-1.5)
SCC -- Properties --> TPA(Trace PAA Day1 <0.005%)
SCC -- Storage Req. --> TEMP_CTRL[Temperature Controlled (15-20°C)]
SCC -- Storage Req. --> PRES_RATE[Pressure-Rated Containers]
Derivative 3.2.2: Extreme-Temperature Stable Composition for Arid Environments
- Enabling Description: A liquid precursor composition formulated for stability under prolonged storage in high-temperature, arid environments (e.g., 40-50°C). It comprises 30% aqueous hydrogen peroxide, 25% triacetin, and 45% water, with an optimized hydrogen peroxide:triacetin mole ratio of 8:1. To enhance high-temperature stability, 200 ppm of 8-hydroxyquinoline is included as an additional chelating agent and free radical scavenger. The pH is maintained at 1.7-2.0. This formulation is demonstrably stable with less than 0.1% PAA formed after 7 days at 45°C, providing robust performance in challenging logistical scenarios.
classDiagram
class LiquidComposition {
+HydrogenPeroxide: 30% (aq)
+Triacetin: 25%
+Water: 45%
+8Hydroxyquinoline: 200 ppm
+pH: 1.7-2.0
+H2O2_Triacetin_MoleRatio: 8:1
+TracePAA_7Days_45C: <0.1%
}
3.3. Cross-Domain Application Derivatives
Derivative 3.3.1: Textile Pre-treatment - On-Demand Bleaching Stock
- Enabling Description: A liquid precursor composition intended for the on-demand preparation of PAA bleaching baths in textile pre-treatment. The composition contains 38% aqueous hydrogen peroxide, 40% triacetin, and 22% water, with a H2O2:triacetin mole ratio of 3.5:1. Its pH is maintained at 1.6. This concentrated, stable precursor forms only trace PAA (<0.03% within 24 hours), ensuring minimal active degradation during storage. Upon activation with a strong alkali in the textile mill's process water, it rapidly generates PAA for delignification and whitening of raw fibers, providing a more flexible and safer alternative to concentrated PAA solutions.
graph TD
A[H2O2-Triacetin Precursor (38% H2O2, 40% Triacetin)] --> B{Textile Mill Storage}
B --> C[Process Water Line]
C --> D[Alkali Addition]
D --> E[Mixing & Reaction (PAA Gen)]
E --> F[Textile Bleaching Bath]
A -- Properties --> P1(H2O2:Triacetin 3.5:1)
A -- Properties --> P2(pH 1.6)
A -- Properties --> P3(Trace PAA <0.03% Day1)
Derivative 3.3.2: Food Preservation - Surface Sterilization Concentrate
- Enabling Description: A liquid precursor composition specifically formulated as a concentrate for on-site dilution and activation for direct surface sterilization in food processing. It consists of 23% aqueous hydrogen peroxide (USP grade), 50% triacetin (GRAS-approved), and 27% sterile water, achieving a H2O2:triacetin mole ratio of 3:1. The pH is 2.1, with no added non-GRAS stabilizers. This composition is designed to form only a negligible trace of PAA (<0.001%) in the concentrate within the first day. When diluted and mixed with a GRAS-approved alkaline solution (e.g., sodium carbonate solution) on a food contact surface or in a spray system, it rapidly generates PAA for microbial reduction, ensuring food safety and regulatory compliance.
classDiagram
class FoodPreservationConcentrate {
+HydrogenPeroxide: 23% (USP grade)
+Triacetin: 50% (GRAS-approved)
+Water: 27% (sterile)
+H2O2_Triacetin_MoleRatio: 3:1
+pH: 2.1
+TracePAA_Day1: <0.001%
+Application: Surface Sterilization
}
3.4. Integration with Emerging Tech Derivatives
Derivative 3.4.1: Smart Packaging with Integrated Stability Sensors
- Enabling Description: A liquid precursor composition (as per Claim 15) stored in smart packaging featuring integrated, passive RFID tags and embedded chemical sensors. These sensors monitor internal temperature, light exposure, and sub-trace PAA formation kinetics (e.g., via a colorimetric indicator or electrochemical sensor). Data from these sensors is wirelessly transmitted to a handheld reader or central inventory system upon proximity, providing a real-time assessment of the composition's shelf life and stability. This smart packaging proactively alerts users if degradation accelerates or if the "trace PAA" threshold is nearing a point that would compromise on-site generation efficiency or safety, enabling just-in-time inventory rotation.
graph TD
C[Liquid Composition Container] --> RFID{Passive RFID Tag}
RFID --> TS[Temp Sensor]
RFID --> LS[Light Sensor]
RFID --> PS[Colorimetric PAA Sensor (Sub-trace)]
TS --> RFID
LS --> RFID
PS --> RFID
RFID --> R(RFID Reader / Handheld Device)
R --> CS[Central Inventory System]
CS --> A[Alerts / Shelf Life Prediction]
Derivative 3.4.2: AI-Optimized Formulation for Variable Storage Conditions
- Enabling Description: A liquid precursor composition where the exact proportions of hydrogen peroxide (23-40%), triacetin (20-52%), and minor stabilizers (e.g., trace amounts of salicylic acid or citrate for pH buffering) are determined by an AI algorithm. The AI takes into account expected storage temperature profiles (e.g., tropical vs. arctic climates), anticipated transportation durations, and target on-site PAA generation kinetics. The AI-generated formula ensures optimal stability (pH 1.46-2.2, trace PAA within 24 hours) under specific, variable supply chain conditions, maximizing shelf life while guaranteeing efficient PAA generation upon activation. The mole ratio of H2O2:triacetin is maintained within 2.98:1 to 12.84:1.
graph TD
I[Input Data (Storage Temp, Transport Duration, Target Kinetics)] --> AI_F[AI Formulation Engine]
AI_F --> O[Optimal Composition Output]
O --> H2O2[Hydrogen Peroxide %]
O --> TA[Triacetin %]
O --> W[Water %]
O --> STAB[Minor Stabilizers (Type/%) (e.g., Salicylic Acid)]
O -- Properties --> pH_R[pH Range 1.46-2.2]
O -- Properties --> MR_R[H2O2:TA Mole Ratio 2.98:1-12.84:1]
O -- Properties --> TPA_R[Trace PAA Day 1]
3.5. The "Inverse" or Failure Mode Derivatives
Derivative 3.5.1: Self-Neutralizing Composition upon Container Breach
- Enabling Description: A liquid precursor composition (as per Claim 15) engineered with a microencapsulated reducing agent (e.g., encapsulated sodium thiosulfate or ascorbic acid). The microcapsules are designed to rupture upon significant mechanical stress, pH shift (e.g., rapid increase to neutral from acidic), or exposure to atmospheric oxygen resulting from a container breach. Upon rupture, the reducing agent is released into the composition, rapidly neutralizing any formed PAA and decomposing hydrogen peroxide, thereby preventing uncontrolled exothermic reactions or exposure to active oxidants in a spill scenario. The original composition maintains its pH of 1.46-2.2 and trace PAA during intact storage.
graph TD
C[Liquid Composition (H2O2-Triacetin, pH 1.46-2.2)] --> M(Microencapsulated Reducing Agent)
M -- Intact --> C
M -- Breach / Stress / pH Shift --> R(Rupture Microcapsules)
R --> NA(Neutralize Active Ingredients)
NA --> S[Safe Degradation Products]
C -- Normal Use --> O[On-site Generation]
Derivative 3.5.2: Visual Degradation Indicator Dye
- Enabling Description: A liquid precursor composition (as per Claim 15) incorporating a non-interfering, redox-sensitive indicator dye (e.g., methylene blue in a specific pH range or a phenolphthalein/thymolphthalein mixture). This dye is initially colorless in the stable, acidic composition (pH 1.46-2.2). However, if significant degradation of hydrogen peroxide occurs (e.g., loss of >5% active H2O2) or if PAA levels exceed the "trace" amount (e.g., >0.1% PAA) due to improper storage or extended shelf life, the dye undergoes a irreversible color change (e.g., blue or pink). This visual cue provides an immediate, qualitative indication to the user that the composition's efficacy or safety profile has been compromised, even without instrumental analysis.
stateDiagram
[*] --> Stable_Composition
Stable_Composition --> Degraded_Composition: H2O2 Loss >5% or PAA >0.1%
Degraded_Composition --> Visually_Indicated: Dye Changes Color
Stable_Composition --> On_Site_Use: Normal Application
Visually_Indicated --> Discard_Or_Test: Action Required
Combination Prior Art Scenarios
These scenarios combine elements of US Patent 9,730,443 with existing open-source standards, demonstrating how further improvements could be considered obvious.
1. US 9,730,443 (Claims 1 & 8) + WO 01/46519 A1 + Open-Source PLC Programming Standard (IEC 61131-3)
- Enabling Description: An on-site PAA generation system (either continuous flow as in Claim 1 or batch as in Claim 8) that replaces the solid TAED acetyl precursor of WO 01/46519 A1 with the liquid hydrogen peroxide-triacetin precursor solution from US 9,730,443. The entire control logic for managing the metering pumps, static mixers, reaction vessels/piping, and alkali injection (e.g., NaOH) is implemented on a Programmable Logic Controller (PLC) using ladder logic, structured text, or function block diagrams conforming to the IEC 61131-3 open-source standard. This combination makes the integration of the improved chemistry into a standard, industrial, open-source automation framework obvious, allowing for precise control and robust operation.
graph TD
A[Raw Water Inlet] --> B{Flow Meter}
C[H2O2-Triacetin Precursor (US9730443)] --> P1{Metering Pump 1}
D[Alkali Solution (NaOH)] --> P2{Metering Pump 2}
B --> M(Mixing & Reaction Section)
P1 --> M
P2 --> M
M --> S{PAA Sensor}
S --> PLC[PLC (IEC 61131-3 Standard)]
B --> PLC
PLC --> P1
PLC --> P2
M --> O[PAA Product Outlet]
2. US 9,730,443 (Claim 15) + Open-Source Green Chemistry Principles + Existing GRAS Food-Grade Stabilizer Standards
- Enabling Description: A liquid precursor composition (as described in Claim 15) for on-site PAA generation, where the specific mole ratios of hydrogen peroxide to triacetin (within 2.98:1 to 12.84:1) and the pH (1.46-2.2) are optimized according to open-source Green Chemistry principles (e.g., maximizing atom economy, minimizing auxiliary substances) to be highly stable and produce minimal waste. Furthermore, trace amounts of specific, multi-functional stabilizing agents, already recognized as Generally Recognized As Safe (GRAS) by the FDA (e.g., ascorbic acid, citric acid, or certain phosphate salts used at concentrations well below regulatory limits for PAA products), are incorporated to further reduce trace PAA formation during storage (below 0.005% within 24 hours). This combination renders obvious the development of environmentally conscious and regulatory-compliant precursor formulations.
graph TD
GC[Open-Source Green Chemistry Principles] --> F(Formulation Optimization)
GRAS[GRAS Food-Grade Stabilizer Standards] --> F
F --> LC[Liquid Composition (US9730443, Claim 15)]
LC -- H2O2 (23-40%) --> I1
LC -- Triacetin (20-52%) --> I2
LC -- Water --> I3
LC -- Trace Stabilizers (GRAS) --> I4
LC -- Optimized Properties --> P(pH 1.46-2.2, H2O2:TA ratio, Trace PAA <0.005% Day1)
3. US 9,730,443 (Claims 1 & 8) + Open-Source Data Logging (Grafana/Prometheus) + Standard Industrial Communication (Modbus TCP/IP)
- Enabling Description: An on-site PAA generation system (either continuous flow or batch) implementing the methods of US 9,730,443 (using H2O2-triacetin and alkali). This system is instrumented with industrial sensors (PAA, H2O2, pH, flow, temperature) that transmit real-time process data via Modbus TCP/IP (a widely adopted open industrial communication protocol) to a local data acquisition gateway. This gateway then forwards the data to a server running an open-source data logging and visualization stack, such as Prometheus for metrics collection and Grafana for dashboarding and alerting. This configuration enables transparent, accessible, and customizable monitoring of the PAA generation process, making the intelligent data exploitation of such systems obvious.
graph TD
S1[PAA Sensor] --> MB(Modbus TCP/IP)
S2[H2O2 Sensor] --> MB
S3[pH Sensor] --> MB
S4[Flow Sensor] --> MB
S5[Temperature Sensor] --> MB
MB --> GW[Data Acquisition Gateway]
GW --> PROM[Prometheus (Metrics Storage)]
PROM --> GRAF[Grafana (Dashboards & Alerts)]
GRAF --> OPS[Operators / Engineers]
GW --> OPC_UA[OPC UA (Alternative)]
Generated 6/9/2026, 10:35:39 PM