Zeolite Membrane Pervaporation for CO2 Absorbing Liquid Regeneration
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Solution Overview
Problem
Conventional carbon dioxide separation methods using amine-based absorbing liquids require significant heat energy for regeneration, increasing costs and energy consumption in large-scale treatment facilities.
Innovation Solution
A method utilizing a membrane separation apparatus with a zeolite membrane to transition the equilibrium state between carbon dioxide and the absorbing liquid, employing pervaporation to separate and regenerate the carbon dioxide, thereby reducing heat energy requirements and integrating a chemical absorption method with a zeolite membrane for an energy-saving hybrid system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a chemical absorption method using amine-based absorbing liquid is used to separate carbon dioxide, then carbon dioxide can be effectively removed from combustion exhaust gas, but a large amount of heat energy is required for regeneration of the absorbing liquid
Solution Approach 1:
The invention changes the physical-chemical parameters of the absorbing liquid by controlling the water content within a specific range (1-10 mass%). This parameter optimization allows the system to achieve effective carbon dioxide absorption while significantly reducing the heat energy required for regeneration, as the optimized water content facilitates easier desorption of carbon dioxide from the amine-based liquid
Solution Approach 2:
The invention uses a composite absorbing liquid system combining amine-based compounds with controlled water content. This composite material approach creates a synergistic effect where the amine provides high carbon dioxide absorption capacity while the optimized water content enables lower energy regeneration, thus resolving the contradiction between removal efficiency and energy consumption
2Use of energy by moving object
If the regeneration temperature of the absorbing liquid is reduced to save energy, then heat energy consumption decreases, but the regeneration efficiency and durability of the absorbing liquid may be affected
Solution Approach 1:
By optimizing the water content parameter within the specific range of 1-10 mass%, the invention enables effective carbon dioxide desorption at lower temperatures. This parameter control ensures that the absorbing liquid can be regenerated efficiently while maintaining its chemical stability and durability, preventing degradation that would occur at excessively low temperatures or high stress conditions
3Quantity of substance
If conventional thermal regeneration is used, then carbon dioxide can be removed from the absorbing liquid, but the cost of carbon dioxide separation increases due to high energy consumption
Solution Approach 1:
The invention optimizes the water content parameter of the absorbing liquid to within 1-10 mass%, which fundamentally changes the energy balance of the regeneration process. This parameter optimization reduces the heat energy required for carbon dioxide desorption, thereby lowering the energy cost of carbon dioxide separation while maintaining effective removal capability
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
This approach significantly reduces the heat energy needed for regeneration, lowers the temperature of the absorbing liquid, and enhances its durability, while also eliminating the need for additional heat sources, thus reducing the overall cost and energy consumption of carbon dioxide separation.
Implementation Method 1
carbon dioxide is separated and removed by a pervaporation method
Implementation Method 2
a membrane separation apparatus that is selectively permeable to carbon dioxide and equipped with a zeolite membrane for carbon dioxide separation
Implementation Method 3
moisture is separated and removed by a pervaporation method
Implementation Method 4
a membrane separation apparatus that is selectively permeable to moisture and equipped with a zeolite membrane for moisture separation
Data Source
AI summary
In a carbon dioxide recovery method including a carbon dioxide absorption step of bringing a gas to be treated containing carbon dioxide into contact with a carbon dioxide absorbing liquid, thereby removing carbon dioxide from the gas to be treated, and a regeneration step of removing carbon dioxide from a rich solution that has absorbed carbon dioxide in the carbon dioxide absorption step, thereby achieving regeneration, the rich solution that has absorbed carbon dioxide is guided in liquid form to a membrane separation apparatus (5) that is selectively permeable to carbon dioxide and equipped with a zeolite membrane for carbon dioxide separation, carbon dioxide is separated and removed by a pervaporation method, and the carbon dioxide absorbing liquid is thus regenerated.