CO2 Separation Membrane with Hydrolysis-Resistant Crosslinked Layer
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Solution Overview
Problem
Conventional carbon dioxide separation membranes face challenges in controlling crosslinking and layer separation due to the use of polymer compounds with multiple crosslinkable groups, leading to difficulties in maintaining uniformity and durability, especially under high humidity and high temperature conditions, which limits their application in processing high-temperature exhaust gases.
Innovation Solution
A carbon dioxide separation member featuring a hydrophobic porous membrane with a polymer compound layer formed using a polymer with a single crosslinkable group, such as polyvinyl alcohol, and a crosslinking agent like epoxy, which forms a hydrolysis-resistant bond, allowing for efficient carbon dioxide separation at temperatures up to 250°C and maintaining durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polymer compounds with multiple crosslinkable groups are used to form the polymer compound layer, then crosslinking can be achieved, but controlling crosslinking and preventing layer separation becomes difficult, leading to poor uniformity and durability
Solution Approach 1:
The patent changes the chemical parameter of the polymer compound from having multiple crosslinkable groups to having a single crosslinkable group. This parameter change simplifies the crosslinking reaction, enables precise control of the crosslinking degree, and prevents layer separation, thereby achieving both sufficient strength and manufacturing precision.
2Ease of manufacture
If conventional polymer compounds are used in the polymer compound layer, then the membrane can be formed, but durability under high humidity and high temperature conditions deteriorates due to hydrolysis
Solution Approach 1:
The patent creates a composite structure by forming a crosslinked polymer compound layer where the crosslinked network provides hydrolysis resistance. The combination of the polymer compound with crosslinking agents creates a new material system that maintains ease of manufacture while achieving high durability under harsh conditions.
Solution Approach 2:
The patent extracts the vulnerable ester bonds from the polymer structure by using polymers without ester groups and instead forming crosslinks through hydrolysis-resistant bonds. This removes the source of hydrolysis degradation while preserving the membrane formation capability.
3Speed
If the polymer compound layer is made thinner to improve carbon dioxide permeation speed, then separation efficiency increases, but the layer becomes more susceptible to degradation and loss of durability
Solution Approach 1:
The patent changes the structural parameter of the polymer layer by introducing crosslinks, which fundamentally alters the layer's properties. This allows the layer to maintain both thinness for high permeation speed and sufficient durability through the crosslinked network structure that prevents degradation.
4Strength
If multiple crosslinkable groups are used in the polymer compound, then crosslinking density can be increased, but layer separation occurs and uniformity is lost
Solution Approach 1:
The patent changes the functional group parameter from multiple crosslinkable groups to a single crosslinkable group per polymer chain. This parameter change enables controlled crosslinking that achieves sufficient crosslinking density while maintaining layer uniformity and preventing separation.
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 solution provides a carbon dioxide separation member with excellent separation characteristics and long-term durability, capable of processing high-temperature exhaust gases while maintaining uniformity and preventing carrier diffusion, thus enhancing the scalability and efficiency of carbon dioxide separation systems.
Implementation Method 1
having a cross-linked structure that is formed with a single crosslinkable group and includes a hydrolysis-resistant bond
Implementation Method 2
a hydrophobic porous membrane that has a heat resistance of 100°C or higher
Implementation Method 3
hydrophobic porous membrane
Implementation Method 4
at least one carbon dioxide carrier selected from the group consisting of alkali metal carbonates, alkali metal bicarbonates, and alkali metal hydroxides
Data Source
AI summary
A carbon dioxide separation member is disclosed, which includes: a hydrophobic porous membrane that has heat resistance to a temperature of 100° C. or higher; and a polymer compound layer that is formed on a surface of the porous membrane, the polymer compound layer including moisture, and at least one carbon dioxide carrier selected from the group consisting of alkali metal carbonates, alkali metal bicarbonates, and alkali metal hydroxides, and having a cross-linked structure that is formed with a specific single crosslinkable group and includes a specific hydrolysis-resistant bond, wherein the carbon dioxide separation member selectively allows a carbon dioxide gas in a mixture of the carbon dioxide gas and a hydrogen gas to permeate therethrough under temperature conditions of from 100° C. to 250° C.