Facilitated CO2 Transport Membrane with Hydration Catalyst
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Solution Overview
Problem
Facilitated CO2 transport membranes face challenges in maintaining high CO2 permeance and selectivity, especially at high CO2 partial pressures due to carrier saturation and the need for energy-intensive regeneration methods in existing chemical absorption processes.
Innovation Solution
Incorporating a CO2 hydration catalyst and a hydrophilic polymer copolymer with acrylic acid cesium or rubidium salt and vinyl alcohol units into a gel membrane, which enhances CO2 permeance and selectivity by accelerating the CO2 hydration reaction and maintaining performance at high temperatures and pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a facilitated transport membrane using carrier substances is employed to achieve high CO2 permeance and selectivity, then CO2 separation performance is improved, but the membrane performance deteriorates at high CO2 partial pressures due to carrier saturation
Solution Approach 1:
The patent changes the functional parameters of the membrane by incorporating catalyst substances that accelerate the CO2 hydration reaction. This chemical catalysis enhances the CO2 transport mechanism, allowing the membrane to maintain high permeance and selectivity even at elevated CO2 partial pressures where conventional carrier-based membranes would saturate and lose performance.
2Measurement precision
If chemical absorption methods are used to separate CO2, then CO2 separation is achieved, but huge equipment and large amounts of steam are required resulting in high energy consumption
Solution Approach 1:
The patent replaces the mechanical/thermal separation process (chemical absorption requiring huge towers and steam heating) with a membrane-based facilitated transport system. The membrane utilizes selective permeation enhanced by catalytic hydration reactions to separate CO2, eliminating the need for large-scale equipment and energy-intensive steam regeneration processes.
3Ease of manufacture
If organic polymer membranes are used for gas separation, then the membrane is inexpensive and easy to manufacture, but the separation mechanism is limited to solution-diffusion which reduces selectivity for gases with different molecular diameters
Solution Approach 1:
The patent creates a composite membrane system that combines organic polymer materials with inorganic catalyst substances. The organic polymer provides ease of manufacture and structural framework, while the incorporated catalyst substances enable facilitated transport mechanisms that dramatically enhance CO2 selectivity beyond what simple solution-diffusion through pure organic membranes can achieve.
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 method produces membranes with improved CO2 permeance and selectivity, enabling efficient CO2 separation from mixed gases with reduced energy consumption and stable performance over time.
Implementation Method 1
Incorporating a CO2 hydration catalyst and a hydrophilic polymer copolymer with acrylic acid cesium or rubidium salt and vinyl alcohol units into a gel membrane, which enhances CO2 permeance and selectivity by accelerating the CO2 hydration reaction
Implementation Method 2
studies are conducted on a permeable membrane called a facilitated transport membrane that allows selective permeation of a gas by a facilitated transport mechanism, in addition to a solution-diffusion mechanism, using a substance called a 'carrier' which selectively and reversibly reacts with CO2
Implementation Method 3
the mechanism of separation is based on a solution-diffusion mechanism in which a gas is separated by means of a difference in solubility of the gas in the membrane material and diffusion rate of the gas in the membrane
Data Source
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AI summary
Provided is a facilitated CO2 transport membrane having improved CO2 permeance and improved CO2 selective permeability. The facilitated CO2 transport membrane includes a separation-functional membrane comprising a hydrophilic polymer gel membrane which contains a CO2 carrier and a CO2 hydration catalyst, wherein the hydrophilic polymer is a copolymer including a first structural unit derived from an acrylic acid cesium salt or an acrylic acid rubidium salt and a second structural unit derived from vinyl alcohol. More preferably, the CO2 hydration catalyst has catalytic activity at a temperature of 100°C or higher.