Amine-Polymer CO2 Separation Membrane for High Flux and Selectivity
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Solution Overview
Problem
Existing carbon dioxide separation membranes have low carbon dioxide permeation rate and selectivity, hindering practical application in cost-effective carbon dioxide capture processes.
Innovation Solution
A carbon dioxide separation membrane comprising a porous membrane with an air permeation flux of 10,000 GPU or more and a separation functional layer formed of a water-soluble polymer with no crosslinked structure and an amine compound with a molecular weight of 500 or less, enhancing both permeation flux and selectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If polymer membranes are used for carbon dioxide separation, then the process is energy-saving and space-saving, but the carbon dioxide permeation rate and selectivity are both low
Solution Approach 1:
The patent changes the chemical composition parameters of the membrane by incorporating specific amine compounds (molecular weight 500 or less) and water-soluble polymers in controlled ratios, which fundamentally alters the permeation mechanism from simple physical diffusion to facilitated transport, thereby achieving both high selectivity and high permeation rate simultaneously
Solution Approach 2:
The patent creates a composite membrane system combining porous membrane support, water-soluble polymer matrix, and amine compound functional groups. This multi-component composite structure integrates the mechanical strength of the porous support with the selective transport capability of the amine-functionalized polymer layer, resolving the contradiction between permeation rate and selectivity
2Manufacturing precision
If facilitated transport membranes with carriers are used to improve carbon dioxide selectivity, then selectivity increases, but the membrane structure becomes more complex
Solution Approach 1:
The patent merges the carrier function and membrane matrix into a single integrated layer by incorporating amine compounds directly into the water-soluble polymer matrix. This eliminates the need for separate carrier layers or complex multi-layer structures, achieving high selectivity while maintaining relatively simple membrane architecture
Solution Approach 2:
The patent controls the molecular weight of amine compounds (500 or less) and their concentration in the membrane to optimize selectivity while preventing excessive structural complexity. By adjusting these parameters, the membrane achieves high carbon dioxide selectivity without requiring complex multi-layer or heterogeneous structures
3Ease of manufacture
If conventional polymer membranes are used, then the membrane is easy to mass-produce, but the carbon dioxide capturing cost remains high due to low performance
Solution Approach 1:
The patent uses water-soluble polymers that can be processed from aqueous solutions, enabling simple casting and drying methods suitable for mass production. By controlling polymer concentration, molecular weight, and amine compound content, high-performance membranes can be manufactured at scale without requiring complex processing equipment or procedures
Solution Approach 2:
The patent employs porous membrane supports with well-defined pore structures that can be manufactured using conventional porous membrane techniques. The porous structure provides mechanical strength while allowing the active separation layer to be formed through simple solution casting, combining ease of manufacture with high separation performance
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 achieves a large carbon dioxide permeation flux and high selectivity, enabling efficient and cost-effective carbon dioxide capture from industrial sources.
Implementation Method 1
a substance (carrier) that reacts reversibly and selectively only with a specific permeation material
Implementation Method 2
The permeation material can permeate by way of a dissolution and diffusion mechanism through the membrane matrix as well as formation of a reaction product with the carrier
Implementation Method 3
The permeation material can permeate by way of a dissolution and diffusion mechanism through the membrane matrix
Data Source
AI summary
Provided is a carbon dioxide separation membrane including a porous membrane having an air permeation flux of 10,000 GPU or more, and a separation functional layer formed on a surface of the porous membrane, wherein the separation functional layer is formed of a composition that contains a water-soluble polymer having no crosslinked structure and an amine compound having molecular weight of 500 or less.