Hydrogen-Selective Membrane Assembly for Gas Separation
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Solution Overview
Problem
Existing hydrogen-producing processes often yield impure hydrogen gas streams that require purification to meet the high purity standards needed for applications in metals, edible fats, semiconductors, and fuel cells, with current purification methods being inefficient in separating hydrogen from mixed gas streams.
Innovation Solution
A hydrogen-processing assembly utilizing hydrogen-selective membranes within a pressure vessel to separate hydrogen gas from other gases, where the mixed gas stream is filtered through the membranes to produce a hydrogen-rich permeate stream and a byproduct stream, with the membranes being made from materials like palladium and its alloys, and optionally incorporating a hydrogen-producing region for on-site hydrogen generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional purification methods are used to separate hydrogen from mixed gas streams, then hydrogen purity can be improved, but separation efficiency is insufficient and the process becomes complex
Solution Approach 1:
The patent employs hydrogen-selective membranes with specific porous structures that allow hydrogen molecules to pass through while blocking other gases. These membranes utilize controlled porosity at the molecular level to achieve both high hydrogen purity in the permeate stream and efficient separation of the mixed gas feed, directly resolving the contradiction between manufacturing precision and productivity
Solution Approach 2:
The invention uses composite membrane structures combining different materials with complementary properties - such as metal membranes (palladium, platinum) for hydrogen selectivity combined with support structures for mechanical strength. This composite approach enables simultaneous achievement of high hydrogen purity and efficient separation performance that neither material could provide alone
2Manufacturing precision
If hydrogen-selective membranes are used to separate mixed gas streams, then hydrogen purity increases, but the device complexity increases due to pressure vessel requirements
Solution Approach 1:
The patent combines the hydrogen separation function with the pressure containment function into a single integrated membrane module design. The pressure vessel is configured to directly house the hydrogen-selective membranes, eliminating the need for separate compression and separation systems. This merging reduces device complexity while maintaining high hydrogen purity through the membrane separation process
3Reliability
If external hydrogen sources are used, then hydrogen supply is reliable, but system efficiency decreases due to additional purification requirements
Solution Approach 1:
The patent designs a multi-functional system where the hydrogen-selective membrane module serves dual purposes: it acts as both a separation device for purifying external hydrogen sources and as a generation system when coupled with reforming catalysts for on-site hydrogen production from hydrocarbons. This universality eliminates the need for separate purification steps and improves overall system efficiency while maintaining reliable hydrogen supply
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
This solution effectively increases hydrogen purity, enhances separation efficiency, and integrates hydrogen production and purification in a single system, reducing the need for external hydrogen sources and improving the overall efficiency of hydrogen gas utilization.
Implementation Method 1
A suitable mechanism for increasing the hydrogen purity of the mixed gas stream is to utilize at least one hydrogen-selective membrane to separate the mixed gas stream into a product stream and a byproduct stream
Implementation Method 2
Hydrogen purification using one or more hydrogen-selective membranes is a pressure driven separation process, in which the one or more hydrogen-selective membranes are contained in a pressure vessel
Data Source
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AI summary
Hydrogen-processing assemblies, components of hydrogen-processing assemblies, and fuel-processing and fuel cell systems that include hydrogen-processing assemblies. The hydrogen-processing assemblies include a hydrogen-separation assembly positioned within the internal volume of an enclosure in a spaced relation to at least a portion of the internal perimeter of the body of the enclosure.