PEM Membrane Cutting-Mill Recycling for Seal-Free Catalyst Separation
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Solution Overview
Problem
Used catalyst-coated polymer electrolyte membranes from PEM fuel or PEM electrolysis cells require efficient comminution for precious metal recycling, but existing methods are inadequate for effectively processing the membranes with elastic seals.
Innovation Solution
A method using a cutting mill to comminute catalyst-coated PEM membranes, allowing for controlled particle size and separation of catalyst-coated PEM membrane and elastic seal components, facilitating efficient recycling and sampling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional comminution methods are used for used PEM membranes with elastic seals, then the precious metal-containing catalyst layer can be processed, but the elastic seal material causes inadequate comminution results and contamination of the precious metal fraction
Solution Approach 1:
The patent applies segmentation by separating the comminution process into distinct stages: first comminuting the entire PEM membrane assembly (catalyst layer + elastic seal) to a coarse fraction, then selectively comminuting only the precious metal-containing fraction in a second stage. This segmentation prevents the elastic seal material from contaminating the precious metal fraction while ensuring adequate processing of the catalyst layer.
Solution Approach 2:
The patent extracts the precious metal-containing catalyst layer fraction from the mixed comminuted material (catalyst + elastic seal) through selective processing. By taking out and separately processing the precious metal fraction, the method eliminates contamination from the elastic seal material, enabling precise precious metal content determination and efficient recycling.
2Ease of operation
If the entire PEM membrane including elastic seal is comminuted together, then processing is simplified, but the elastic seal material contaminates the precious metal fraction and prevents accurate analysis
Solution Approach 1:
The patent segments the comminution operation into two distinct phases: an initial comminution of the complete PEM membrane assembly followed by selective processing of the precious metal-containing fraction. This segmentation maintains operational simplicity while eliminating elastic seal contamination from the precious metal fraction, enabling accurate precious metal content analysis.
3Productivity
If coarse comminution is performed to handle large surface area membranes, then processing time is reduced, but the particle size is too large for representative sampling and precious metal analysis
Solution Approach 1:
The patent segments the comminution process into two size-reduction stages: first reducing the large surface area membranes to a coarse fraction for efficient handling, then selectively comminuting the precious metal-containing fraction to a fine particle size. This segmented approach maintains high productivity while achieving the fine particle size necessary for representative sampling and precise precious metal analysis.
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
Enables effective comminution and separation of catalyst-coated PEM membrane and elastic seal components, allowing for precise precious metal analysis and recycling, with the catalyst-coated fraction achieving a desired particle size for efficient recycling and the elastic seal fraction being usable as an additive.
Implementation Method 1
comminution can be effectively carried out using a cutting mill
Data Source
AI summary
Method for comminuting spent, catalyst-coated PEM membranes from PEM fuel and/or PEM electrolysis cells using a cutting mill.