Hydrogen Oxygen Separation via High-Pressure Membrane
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Solution Overview
Problem
Current methods for purifying hydrogen gas produced by photocatalytic water splitting lack reliability and safety due to the highly explosive nature of the hydrogen-oxygen gas mixture, requiring effective separation and purification techniques that are not yet commercially viable.
Innovation Solution
A high-pressure process involving compression, membrane separation, and catalytic combustion to safely and reliably separate and purify hydrogen from oxygen, utilizing a selectively permeable membrane and a catalytic combustion unit to achieve high-purity hydrogen production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional separation methods are used for hydrogen-oxygen gas mixture, then separation can be achieved, but reliability and safety deteriorate due to the highly explosive nature of the gas mixture
Solution Approach 1:
The patent changes the pressure parameter by compressing the hydrogen-oxygen gas mixture to high pressure (30-200 bars) before membrane separation. This parameter change enables the use of selective membranes that achieve effective hydrogen separation at high pressure while preventing explosive conditions through controlled compression in spark-free environments
Solution Approach 2:
The patent introduces a selectively permeable membrane as an intermediary substance between the hydrogen-oxygen gas mixture and the separation output. This membrane mediator selectively allows hydrogen to pass through while blocking oxygen, achieving safe separation without direct contact or mixing that could cause explosion
2Productivity
If high-pressure compression is applied to the gas mixture, then membrane separation efficiency improves, but device complexity and safety requirements increase
Solution Approach 1:
The patent segments the separation process into distinct stages: compression in a spark-free environment, membrane separation at high pressure, and combustion of the separated hydrogen. This segmentation allows each component to be optimized independently, with the membrane unit focusing solely on separation while the compression and combustion are handled by specialized subsystems
3Manufacturing precision
If combustion is used to purify hydrogen permeate, then hydrogen purity improves to 90-99.5 mol%, but energy loss occurs during the combustion process
Solution Approach 1:
The patent converts the harmful effect of combustion (energy loss and potential explosion) into a beneficial purification process. By controlling combustion in a catalytic reactor, residual oxygen is removed and hydrogen purity is enhanced to 90-99.5 mol%, while the combustion heat is captured and reused for steam generation, turning energy loss into a useful byproduct
Data Source
AI summary
Embodiments of the invention are directed to methods, processes, and systems for safely and reliably purifying hydrogen from a gas mixture containing hydrogen and oxygen.