Diselenide Polyimide Membrane Gas Separation
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Solution Overview
Problem
Existing polyimide membranes face challenges in achieving high selectivity for gas adsorption while maintaining high permeability, which limits their efficiency in gas separation and purification processes.
Innovation Solution
A polyimide membrane is developed using reacted units of 4,4′-diselanediyldianiline and ethylenediaminetetraacetic dianhydride, bonded through imides in an alternating pattern, which enhances thermal stability and gas separation capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional polyimide membranes are used for gas separation, then the membrane structure is stable, but the selectivity for gas adsorption is limited and permeability is low
Solution Approach 1:
The patent incorporates diselenide groups into the polyimide membrane structure to create a composite material system. This integration of diselenide functional groups with polyimide backbone provides both structural stability and enhanced gas separation performance, resolving the contradiction between stability and productivity.
Solution Approach 2:
The patent modifies the chemical composition parameters of the polyimide membrane by introducing diselenide compounds as monomers. This changes the physical and chemical properties of the membrane, enabling it to achieve both high structural stability and improved gas separation efficiency through altered molecular architecture.
2Productivity
If membrane thickness is reduced to increase permeability, then gas passage is improved, but selectivity and mechanical strength decrease
Solution Approach 1:
The patent creates local functional regions within the membrane structure where diselenide groups are strategically positioned to provide selective gas adsorption sites. This local quality enhancement allows the membrane to maintain selectivity even at reduced thickness by concentrating functional groups in specific areas.
3Ease of manufacture
If conventional polyimide membranes are used, then manufacturing is straightforward, but thermal stability and chemical resistance are insufficient for harsh environments
Solution Approach 1:
The patent changes the chemical composition parameters of the polyimide by incorporating diselenide monomers, which fundamentally alters the thermal and chemical resistance properties. This parameter change enables the membrane to withstand harsh environments while maintaining ease of manufacture through standard polyimide fabrication processes.
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 membrane exhibits improved thermal stability, chemical resistance, and selective gas adsorption abilities, achieving efficient gas separation with higher permeability compared to traditional polyimide membranes.
Implementation Method 1
The gas having an affinity for the sorbent is held, fixed, and/or adsorbed by the sorbent itself
Implementation Method 2
Another method for gas separation is the use of membranes, where the gases having a higher affinity for the membrane are retained and any the other gases pass through the membrane
Data Source
AI summary
A polyimide membrane based on a polymer comprising polymerized units of a diselenide compound and having Formula I. A method of fabrication of the membrane using the polyimide-containing polymer and a method for separating one or more gases from a gaseous mixture using the membrane.