Graphene Oxide Ionic Liquid Polymer Separation Membrane
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Solution Overview
Problem
Conventional separation membranes have limitations in achieving high separation performance for gas mixtures containing acid gases, particularly those with gases of larger molecular sizes.
Innovation Solution
A separation membrane comprising a separation functional layer made of graphene oxide, an ionic liquid, and a polymer, applied as a coating liquid to a substrate and dried to form a membrane with enhanced separation capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional separation membrane is used, then the membrane structure is simple, but the separation performance for gas mixtures containing acid gases is insufficient
Solution Approach 1:
The patent applies composite materials by combining graphene oxide, ionic liquid, and polymer in the separation functional layer. This composite structure enables high separation performance for acid gases while managing the complexity through systematic material integration rather than simple single-material layers.
Solution Approach 2:
The patent implements local quality by creating a separation functional layer with specific local composition (graphene oxide, ionic liquid, polymer) that provides enhanced separation performance specifically at the membrane interface where gas separation occurs, while other layers maintain simpler structures.
2Reliability
If the separation functional layer uses only polymer and ionic liquid, then the membrane is easy to manufacture, but the separation performance for gases with larger molecular sizes is insufficient
Solution Approach 1:
The patent enhances the separation functional layer by incorporating graphene oxide into the polymer-ionic liquid composite. This composite material approach improves separation performance for gases with larger molecular sizes while maintaining manufacturability through the coating method.
3Reliability
If a gel layer including polymer and ionic liquid is used as separation functional layer, then the membrane can separate acid gas, but the separation performance needs further improvement
Solution Approach 1:
The patent transforms the gel layer into a composite separation functional layer by adding graphene oxide to the polymer-ionic liquid system. This composite structure enhances both separation performance and productivity by providing additional pathways for acid gas separation while maintaining selectivity.
Solution Approach 2:
The patent utilizes the porous structure of graphene oxide in the separation functional layer to enhance gas transport efficiency. The porous material provides increased surface area and multiple transport pathways, improving both separation performance and productivity simultaneously.
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 separation performance for gas mixtures containing acid gases, including those with larger molecular sizes, such as carbon dioxide and nitrogen, with a high separation factor and permeation rate.
Implementation Method 1
drying the coating film
Implementation Method 2
a separation functional layer including: graphene oxide; an ionic liquid; and a polymer
Data Source
AI summary
The present invention provides a separation membrane having high separation performance in terms of a gas mixture containing an acid gas. A separation membrane 10 of the present invention includes a separation functional layer 1 including: graphene oxide; an ionic liquid; and a polymer. The ionic liquid is, for example, hydrophilic and contains an imidazolium ion and tetrafluoroborate. A method for manufacturing the separation membrane 10 of the present invention includes: applying a coating liquid containing the graphene oxide, the ionic liquid, and the polymer to a substrate to obtain a coating film; and drying the coating film.