Fluorinated Copolymer Membrane for Gas Separation Selectivity
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Solution Overview
Problem
Current membrane-based gas separation technologies, particularly those using perfluoropolymer membranes, face challenges in achieving high selectivity for gas pairs such as H2/CH4, He/CH4, CO2/CH4, and N2/CH4, while also maintaining high flux and chemical resistance.
Innovation Solution
Copolymerization of perfluorinated dioxolane monomers with fluorovinyl monomers, such as trifluoroethylene, chlorotrifluoroethylene, or perfluoro methyl vinyl ether, to create a selective layer in membranes that balances crystallinity and amorphous phases, enhancing gas separation properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If perfluoropolymer membranes are used for gas separation, then chemical resistance is improved, but selectivity for gas pairs (H2/CH4, He/CH4, CO2/CH4, N2/CH4) deteriorates
Solution Approach 1:
The patent employs composite copolymer membranes combining perfluorinated dioxolane monomers with fluorovinyl monomers. This composite structure integrates the chemical resistance of perfluoropolymers with enhanced gas separation selectivity through controlled crystallinity and amorphous phase balance, resolving the contradiction between chemical stability and separation performance
Solution Approach 2:
The patent modifies polymer structure parameters by controlling the ratio of crystalline to amorphous phases in the copolymer membrane. By adjusting monomer composition and polymerization conditions, the membrane achieves optimal free volume and chain packing that simultaneously maintains chemical resistance and enhances selectivity for specific gas pairs
2Manufacturing precision
If copolymerization of perfluorinated dioxolane monomers with fluorovinyl monomers is performed to balance crystallinity and amorphous phases, then gas separation selectivity is improved, but membrane complexity increases
Solution Approach 1:
The patent applies local quality by creating distinct crystalline and amorphous regions within the membrane structure. The copolymer composition is designed to have specific local domains with different degrees of order, where crystalline regions provide selectivity and amorphous regions provide permeability, achieving high gas separation performance without excessive overall complexity
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 resulting copolymer membranes exhibit improved selectivity and permeability for gas separation applications, including the separation of hydrogen, carbon dioxide, nitrogen, and helium from methane, making them suitable for natural gas processing and other industrial gas separations.
Implementation Method 1
a process for separating two components, A and B, of a gas mixture
Implementation Method 2
Gas permeation in a dry Nafion membrane
Data Source
AI summary
A process for separating components of a gas mixture using gas-separation copolymer membranes. These membranes use a selective layer made from copolymers of an amorphous perfluorinated dioxolane and a fluorovinyl monomer. The resulting membranes have superior selectivity performance for gas pairs of interest while maintaining fast gas permeance compared to membranes prepared using conventional perfluoropolymers, such as Teflon® AF, Hyflon® AD, and Cytop®.