Gas Separation Membranes Using Graphene Oxide and Ionic Liquids
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Solution Overview
Problem
Current CO2 capture technologies face challenges due to high costs and technical limitations, particularly in achieving efficient separation of CO2 from gas mixtures while maintaining selectivity and permeability.
Innovation Solution
A composite membrane is developed comprising a selective layer with a polymeric matrix, graphene oxide nanofillers, and mobile carriers, which enhances CO2 permeance and selectivity by disrupting polymer chain packing and increasing CO2 solubility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional polymeric membranes are used for CO2 separation, then the membrane structure is simple and easy to manufacture, but the permeability and selectivity are limited by the Robeson upper bound
Solution Approach 1:
The patent applies composite materials by combining polymeric matrix with graphene oxide nanofillers and mobile carriers to create a hybrid membrane structure. The graphene oxide nanosheets provide selective pathways for CO2 transport while the mobile carriers facilitate CO2 diffusion, achieving superior permeability and selectivity beyond conventional polymeric membranes while maintaining manufacturing feasibility through solution casting methods
2Productivity
If nanofillers are added to polymeric membranes to improve CO2 permeation, then permeability increases, but the membrane structure becomes more complex and fabrication difficulty increases
Solution Approach 1:
The patent utilizes porous graphene oxide nanosheets as fillers within the polymeric matrix. The porous structure of graphene oxide provides additional pathways for CO2 transport, increasing permeability while the nanoscale dimensions prevent excessive structural complexity. The mobile carriers further enhance CO2 permeation by facilitating diffusion through the porous network
3Productivity
If mobile carriers are added to the polymeric matrix to increase CO2 transport, then CO2 flux increases, but the membrane may experience carrier saturation
Solution Approach 1:
The patent optimizes the concentration and distribution parameters of mobile carriers within the polymeric matrix. By carefully controlling the amount and spatial arrangement of carriers, the membrane achieves high CO2 flux while preventing carrier saturation through adequate carrier density and uniform distribution, ensuring reliable performance across varying operating conditions
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 composite membrane exhibits increased CO2 permeance and flux compared to traditional membranes, even at industrially relevant conditions, while maintaining selectivity and resisting carrier saturation.
Implementation Method 1
The presence of hydroxyl groups on the GO surface also brings in hydrophilicity and increased surface interaction with CO2
Implementation Method 2
inducing changes in crystallinity, fractional free volume and CO2 solubility
Implementation Method 3
These facilitated transport membranes transfer CO2 through an additional reactive pathway than conventional polymers that follow solution-diffusion mechanism
Implementation Method 4
small CO2-philic molecules that reversibly react with CO2 are also added to the polymeric host matrices as mobile carriers
Implementation Method 5
Membrane materials with preeminent permeation properties (permeability and selectivity), as well as good chemical and mechanical properties, increase efficiency of separation processes significantly
Data Source
AI summary
A composite membrane suitable for separating a gas from a gas mixture comprising a selective layer coated on a support, wherein said selective layer comprises: a) a polymeric matrix comprising an amine polymer; b) a graphene oxide nanofiller; and c) a mobile carrier selected from an ionic liquid or an amino acid salt.