Peracetic Acid Sensor Filter for Hydrogen Peroxide Removal
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Solution Overview
Problem
Existing gas sensors for peracetic acid (PAA) suffer from cross-sensitivity to hydrogen peroxide vapor, leading to inaccurate readings and potential hazardous exposure, as they are often used in environments where both PAA and hydrogen peroxide are present, and current chemical filters are either ineffective or cumbersome.
Innovation Solution
A compact chemical filter using a hydrogen peroxide disproportionation catalyst is placed in the gas path of PAA sensors, allowing PAA to pass through while effectively removing hydrogen peroxide vapor, thereby reducing cross-sensitivity and enhancing sensor accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a chemical filter is used to remove hydrogen peroxide vapor, then cross-sensitivity is reduced and measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent employs a porous substrate material that provides high surface area for the catalyst while maintaining gas permeability. The porous structure allows hydrogen peroxide vapor to access the catalyst sites efficiently while allowing PAA vapor to pass through to the sensor, achieving effective interference removal without blocking the target gas signal.
Solution Approach 2:
The filter comprises a composite structure combining a porous substrate with a deposited catalyst layer. This composite material integrates the mechanical support function of the substrate with the chemical reactivity of the catalyst, creating a compact filter element that achieves high removal efficiency for hydrogen peroxide while maintaining structural integrity and gas flow properties.
2Volume of moving object
If a compact filter design is used, then device size is reduced and ease of operation is improved, but filtering effectiveness may be compromised
Solution Approach 1:
The porous substrate provides a high surface area-to-volume ratio, allowing a large amount of catalyst to be packed into a compact filter element. This enables effective hydrogen peroxide removal in a small volume while maintaining sufficient contact time between the vapor and catalyst for complete reaction.
Solution Approach 2:
The patent optimizes parameters including pore size distribution, catalyst particle size, catalyst loading density, and filter thickness to achieve maximum removal efficiency in a compact form. By carefully controlling these parameters, the filter achieves high effectiveness without requiring large dimensions that would increase device size.
3Duration of action of moving object
If a catalyst is used instead of consumable reagents, then duration of action is extended and loss of substance is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The porous substrate provides a uniform distribution surface for the catalyst, ensuring even deposition across the filter area. This uniform distribution maximizes the utilization of catalyst material and extends the operational life of the filter by preventing localized depletion or aggregation that would reduce effectiveness over time.
Solution Approach 2:
The catalyst operates autonomously through the disproportionation reaction mechanism, continuously converting hydrogen peroxide to water and oxygen without requiring external reagent replenishment. This self-sustaining chemical process eliminates the need for periodic filter replacement or reagent refilling, significantly extending sensor operational lifespan.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The filter significantly reduces cross-sensitivity to hydrogen peroxide, ensuring accurate PAA readings and extending sensor lifespan by using a catalyst that does not consume reagents, allowing for a smaller, more efficient filter design that maintains sensitivity and response time.
Implementation Method 1
A compact chemical filter using a hydrogen peroxide disproportionation catalyst is placed in the gas path of PAA sensors
Implementation Method 2
A compact chemical filter using a hydrogen peroxide disproportionation catalyst is placed in the gas path of PAA sensors
Implementation Method 3
allowing PAA to pass through while effectively removing hydrogen peroxide vapor
Data Source
AI summary
A filter that is used in conjunction with a non-specific gas sensor for PAA, which allows specific detection of PAA vapor in the presence of hydrogen peroxide vapor through the removal of the hydrogen peroxide vapor. The filter contains a filter catalyst that will catalyze the disproportionation of hydrogen peroxide but not react with PAA vapor, thus removing the hydrogen peroxide vapor and allowing the peracetic vapor to pass through the filter to the sensor.