Porous Amine CO2 Absorbent for Low-Energy Regeneration
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Solution Overview
Problem
Existing carbon dioxide absorbents, particularly those containing amine compounds and porous materials, face challenges in energy efficiency, thermal stability, and repeated usability during carbon dioxide capture and separation.
Innovation Solution
A carbon dioxide absorbent comprising an amine compound with a specific structure and a porous material, such as porous silica or alumina, supports the amine compound to enhance carbon dioxide absorption and desorption under lower energy conditions, reducing volatilization and improving repeated usability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If aqueous solutions of amine compounds are used as carbon dioxide absorbent, then carbon dioxide can be captured, but a lot of energy is required due to high latent and specific heat of water
Solution Approach 1:
The patent uses porous materials (such as porous silica, porous alumina, or porous polymers) as the support matrix for the amine compound. The porous structure provides high surface area for CO2 absorption while allowing the amine to be immobilized, eliminating the need for bulk water and thereby reducing the energy required for heating and phase change.
Solution Approach 2:
The patent creates a composite material consisting of an amine compound supported on a porous material. This composite structure combines the CO2 absorption capability of the amine with the structural benefits of the porous support, enabling low-energy operation without bulk water while maintaining high absorption capacity.
2Quantity of substance
If amine compounds are used in carbon dioxide absorbent, then carbon dioxide can be captured, but volatility of the amine compounds is increased causing loss during gas contact
Solution Approach 1:
The patent extracts the volatile amine compound from its conventional aqueous solution form and immobilizes it on a porous support material. This separation allows the amine to function for CO2 absorption while the porous matrix prevents volatilization, eliminating the trade-off between absorption capacity and compound loss.
3Productivity
If carbon dioxide absorbent is regenerated by boiling with steam heating, then carbon dioxide can be released, but a very large amount of thermal energy is required
Solution Approach 1:
The patent changes the operational parameters of the absorbent system by using a porous-supported amine instead of bulk aqueous amine. This structural change enables CO2 release at lower temperatures through pressure swing or temperature swing adsorption, eliminating the need for high-temperature steam heating and dramatically reducing thermal energy consumption.
4Productivity
If conventional carbon dioxide absorbents are used, then carbon dioxide can be captured, but thermal stability is reduced due to thermal decomposition of amine compounds during regeneration
Solution Approach 1:
The patent introduces a porous support material as an intermediary between the amine compound and the thermal environment. This intermediary protects the amine from direct thermal decomposition while still allowing CO2 to be absorbed and released, thereby maintaining thermal stability without sacrificing capture capacity.
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 absorbent achieves high carbon dioxide absorption capacity and retention rate with excellent repeated usability, enabling efficient carbon dioxide capture and separation at lower energy costs.
Implementation Method 1
an amine compound (A) having a specific structure and a porous material (B)... carbon dioxide absorbent with a good carbon dioxide absorption property
Implementation Method 2
an amine compound (A) having a specific structure and a porous material (B)... excellent repeated usability
Implementation Method 3
a desorption step of desorbing carbon dioxide from the carbon dioxide absorbent with carbon dioxide absorbed in the absorption step
Data Source
Figure 1
AI summary
Provided are a carbon dioxide absorbent comprising an amine compound (A) represented by the following general formula (1) and a porous material (B), a method for capturing carbon dioxide using the carbon dioxide absorbent, and a carbon dioxide separation and capture apparatus. In the formula (1), each R1 independently represents a hydroxy group or an organic group having 1 to 10 carbon atoms. n1 to n4 each independently represent a number of 1 to 8, and m represents a number of 0 to 10.