PTFE/PFSA Composite Membrane for Low Flow Resistance Filtration
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Solution Overview
Problem
Current PTFE membranes are inadequate for filtering hot sulfuric peroxide mixtures and metal-containing fluids due to high flow resistance and limited metal scavenging efficiency, particularly in applications requiring low dewetting characteristics.
Innovation Solution
A porous membrane is developed by blending PTFE with perfluorosulfonic acid (PFSA) additive, which is cross-linked or non-cross-linked, and processed to achieve a critical wetting surface tension of 30-40 dynes/cm, allowing effective filtration of sulfuric peroxide mixtures and metal-containing fluids with low flow resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PTFE membranes are used for filtering sulfuric peroxide mixture and metal-containing fluids, then chemical resistance and filtration capability are improved, but flow resistance increases and metal scavenging efficiency is limited
Solution Approach 1:
The patent combines PTFE with PFSA (perfluorosulfonic acid) to create a composite membrane material. The PTFE provides chemical resistance and filtration capability, while the PFSA component introduces metal scavenging functionality and modifies surface properties to reduce flow resistance, thereby resolving the contradiction between filtration performance and flow efficiency
Solution Approach 2:
The patent modifies the surface tension parameter of the membrane by incorporating PFSA additive, achieving a critical wetting surface tension of 30-40 dynes/cm. This parameter change improves wetting characteristics and reduces flow resistance while maintaining the filtration capability provided by the PTFE matrix
2Stability of the object's composition
If PTFE membranes are used for metal-containing fluid filtration, then chemical stability is improved, but metal scavenging efficiency deteriorates
Solution Approach 1:
The patent creates a composite system where PTFE provides chemical stability and inertness, while PFSA (particularly when cross-linked) provides metal scavenging functionality through its sulfonic acid groups. This composite approach allows both chemical stability and metal removal efficiency to coexist
Solution Approach 2:
The patent applies different functional properties to different aspects of the membrane: the bulk PTFE matrix provides chemical stability and structural integrity, while the PFSA component localized within the membrane provides metal scavenging capability, creating local quality differentiation that resolves the contradiction
3Reliability
If membrane surface tension is reduced to improve wetting characteristics, then non-dewetting properties are improved, but flow resistance may increase
Solution Approach 1:
The patent optimizes the surface tension parameter to a specific range (30-40 dynes/cm critical wetting surface tension) that balances wetting characteristics and flow resistance. This precise parameter control ensures non-dewetting properties while maintaining acceptable flow characteristics
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 PTFE/PFSA membrane achieves high metal scavenging efficiency and low flow resistance, maintaining non-dewetting properties, suitable for a wide range of filtration applications including pharmaceutical, medical, and industrial uses, while being easily integrated into existing manufacturing processes.
Implementation Method 1
passing the fluid through a porous membrane comprising PTFE blended with perfluorosulfonic acid (PFSA) additive, and removes particles from the fluid
Implementation Method 2
a porous membrane which is formed from a porous polyperfluorocarbon membrane substrate having its surface modified with a perfluorocarbon polymer composition comprising, e.g., Nafion
Implementation Method 3
perfluorosulfonic acid (PFSA) additive
Implementation Method 4
the membrane has a CWST of about 30 dynes/cm (about 30 x 10^-5 N/m), wherein the CWST is a critical wetting surface tension
Data Source
AI summary
A porous membrane comprising PTFE blended with PFSA is disclosed.