Gas Separation Membrane with Antioxidant Layer for Oxidation Resistance
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Solution Overview
Problem
Conventional gas separation membranes using polyethylene oxide are prone to deterioration due to oxidizing gases, which affects their durability.
Innovation Solution
A gas separation membrane incorporating a separate functional layer with a polymer having a polyethylene oxide structure and an antioxidant with an I/O value of 0.4 or less, enhancing durability against oxidizing gases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polymer separation membrane is used for gas separation, then gas separation function is achieved, but the polymer deteriorates due to oxidizing gases
Solution Approach 1:
An antioxidant layer is introduced as an intermediary between the oxidizing gas and the polyethylene oxide polymer. This antioxidant layer (containing vitamin E or analogous compounds) acts as a mediator that absorbs and neutralizes the oxidizing stress, protecting the underlying polymer from direct contact with harmful oxidizing gases while maintaining the membrane's gas separation functionality
Solution Approach 2:
The invention creates a composite membrane structure combining the polyethylene oxide polymer layer with an antioxidant-containing layer. This composite structure integrates the gas separation capability of PEO with the oxidation resistance of antioxidants (such as vitamin E), achieving both functional requirements simultaneously through material composition rather than relying on a single material
2Productivity
If polyethylene oxide is used as the polymer, then gas separation efficiency is improved, but oxidation resistance deteriorates
Solution Approach 1:
The membrane is segmented into functionally distinct layers: a polyethylene oxide layer responsible for gas separation efficiency and an antioxidant layer responsible for oxidation resistance. This segmentation allows each layer to optimize its specific function without compromising the other, with the antioxidant layer specifically protecting the PEO layer from degradation
Solution Approach 2:
The membrane employs a composite structure where polyethylene oxide provides superior gas separation performance while antioxidants (vitamin E or analogous compounds) provide oxidation resistance. The composite design allows the PEO to maintain its high gas separation efficiency while the antioxidant component compensates for PEO's vulnerability to oxidation
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 durability and efficiency in separating carbon dioxide from mixed gases, particularly in combustion exhaust gases, contributing to climate change mitigation.
Implementation Method 1
a gas separation membrane that separates a specific gas component from a mixed gas
Implementation Method 2
inhibiting deterioration of a polymer in a gas separation membrane due to an oxidizing gas
Data Source
Figure 1~3
AI summary
Provided is a gas separation membrane which is excellent in durability with respect to deterioration of a polymer due to an oxidizing gas. A gas separation membrane according to the present disclosure includes: a separate functional layer that contains an antioxidant and a polymer which has a polyethylene oxide structure, the polymer which has the polyethylene oxide structure including an ethyleneoxy unit at a proportion of 57% or more in terms of weight ratio with respect to 100% of constitutional units of a main chain, and the antioxidant having an I/O value of 0.4 or less in an organic conceptual diagram.