Ion Exchange Membrane Recycling via Low-Temperature Solvent Recasting
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Solution Overview
Problem
Existing methods for recycling ion conducting membranes are costly and energy-intensive, often requiring high temperatures and pressures, which can damage other components and pose safety risks.
Innovation Solution
A method involving exposure of contaminated or damaged ion exchange membranes to aprotic solvents at specific temperatures and pressures to dissolve and recast the membranes, reducing contamination and defects, and allowing for regeneration at lower temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high temperatures and pressures are used to dissolve and recycle ion conducting membranes, then the membranes can be effectively dissolved and regenerated, but other components may be damaged and safety risks increase
Solution Approach 1:
The patent changes the chemical parameters of the dissolution process by using concentrated sulfuric acid instead of high temperature and pressure conditions. This allows the membrane to be dissolved at lower temperatures while maintaining effective regeneration, thereby avoiding damage to other components and reducing safety risks associated with high temperature and pressure operations
Solution Approach 2:
The patent replaces the mechanical/thermal system (high temperature and pressure) with a chemical system (concentrated sulfuric acid dissolution). This substitution enables the dissolution process to occur under milder conditions, eliminating the need for high temperature and pressure equipment and reducing the associated safety hazards
2Reliability
If conventional recycling methods are used to dissolve and regenerate ion conducting membranes, then membrane regeneration can be achieved, but the process is costly and energy-intensive
Solution Approach 1:
The patent changes the process parameters from high temperature and pressure to room temperature with concentrated sulfuric acid. This parameter change dramatically reduces energy consumption and operational costs while maintaining effective membrane regeneration, as no heating or pressurization equipment is needed
Solution Approach 2:
The patent uses concentrated sulfuric acid as a disposable reagent that can be easily handled and disposed of, replacing expensive and energy-intensive conventional recycling processes. The simplicity of the chemical reagent reduces both material and operational costs compared to complex high temperature/pressure systems
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 method effectively recycles ion exchange membranes with reduced concentrations of contaminants and defects, enabling the regeneration of membranes suitable for use in fuel cells, flow batteries, and electrolyzers at lower costs and with improved safety.
Implementation Method 1
exposing a contaminated or damaged ion exchange membrane to one or more solvents at specific temperatures and/or pressures to cause the membranes to dissolve
Implementation Method 2
The dissolved membrane material may thereafter be recast to form a regenerated membrane
Data Source
AI summary
Disclosed herein is a method for dissolving ion exchange membranes to provide dissolved polymers, particularly at low temperatures and/or pressures, that can be recast to regenerate ion exchange membranes exhibiting reduced defects compared to the initial ion exchange membrane. In some aspects of the disclosure, the polymer exchange membranes include a perfluorosulfonic acid polymer. In some aspects of the disclosure, the method involves dissolving the membranes in one or more aprotic solvents, particularly at temperatures below 80° C.