Polycarbonate-Polyorganosiloxane Copolymer Membrane for CO2 Separation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing gas separation membranes, particularly those based on polycarbonate-polyorganosiloxane copolymers, suffer from insufficient selectivity, transmission amount, and mechanical strength for carbon dioxide separation.
Innovation Solution
A gas separation membrane comprising a polycarbonate-polyorganosiloxane copolymer with specific structural units and a polyorganosiloxane block content between 20 to 70 mass% enhances carbon dioxide selectivity and transmission while maintaining mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a gas transmission membrane with siloxane bond structure is used, then gas transmittance is improved, but selectivity and mechanical strength are insufficient
Solution Approach 1:
The patent employs a block copolymer structure combining polycarbonate segments (for mechanical strength and selectivity) with polyorganosiloxane segments (for gas transmittance). This composite molecular architecture allows simultaneous achievement of high CO2 permeability and adequate mechanical properties, resolving the contradiction between gas transmittance and selectivity/mechanical strength
2Productivity
If polyorganosiloxane block content is increased to improve gas transmission, then transmission amount is improved, but mechanical strength deteriorates
Solution Approach 1:
The patent optimizes the content of polyorganosiloxane blocks within a specific range (20-70 mass%) to balance gas transmission and mechanical strength. By controlling this compositional parameter, the invention achieves high CO2 transmission while maintaining adequate mechanical properties, resolving the trade-off between transmission amount and mechanical strength
3Ease of manufacture
If existing polymer membrane structures are used, then ease of manufacture is maintained, but selectivity and transmission amount are insufficient
Solution Approach 1:
The patent modifies the molecular structure parameters of conventional polymers by introducing block copolymer architecture with specific compositional ratios. This structural parameter change enables simultaneous improvement of selectivity and transmission amount while maintaining compatibility with existing manufacturing processes
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 high carbon dioxide selectivity and transmission, with a product coefficient of 5.0×10³ Barrer or more, and excellent mechanical strength, suitable for applications in exhaust gas purification.
Implementation Method 1
a gas separation membrane for separating carbon dioxide from a mixed gas containing the carbon dioxide
Implementation Method 2
the product of a carbon dioxide transmission coefficient and a thickness of the gas separation membrane
Data Source
AI summary
The present invention relates to a gas separation membrane for separating carbon dioxide from a mixed gas containing the carbon dioxide, the gas separation membrane including a polycarbonate-polyorganosiloxane copolymer (A), wherein the polycarbonate-polyorganosiloxane copolymer (A) contains a polycarbonate block (A-1) consisting of repetition of a structural unit represented by the following general formula (I) and a polyorganosiloxane block (A-2) including repetition of a structural unit represented by the following general formula (II), and wherein a content of the polyorganosiloxane block (A-2) in the polycarbonate-polyorganosiloxane copolymer (A) is from 20 mass % or more to 70 mass % or less:wherein R1, R2, R3, R4, X, “a”, and “b” are as defined in Description.