Regeneratable Ion Exchange Material for CO2 Capture
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Solution Overview
Problem
Current methods for reducing carbon dioxide concentration in the atmosphere often consume sorbent materials and do not chemically bind CO2 effectively, necessitating the development of a regeneratable ion exchange material that can convert CO2 into a stable, easily isolable form without using cost-intensive manmade resources.
Innovation Solution
A method utilizing a regeneratable ion exchange material comprising earth alkali metal cations, such as bentonite, which exchanges cations with a source of cations to release earth alkali metal cations that react with CO2 to form a stable carbonate salt, allowing for the regeneration of the ion exchange material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sorbent materials are used to reduce CO2 concentration, then CO2 can be absorbed, but the sorbent materials are consumed and cannot be regenerated
Solution Approach 1:
The patent implements a cyclic process where the sorbent material is discarded from the CO2 absorption stream and then recovered through regeneration with acid solution. The spent sorbent is treated with acid to release CO2 and restore the sorbent's capacity, allowing it to be reused in subsequent absorption cycles. This resolves the contradiction by enabling sorbent regeneration while maintaining continuous CO2 removal capability.
Solution Approach 2:
The patent introduces an acid solution as an intermediary substance that facilitates the regeneration of the sorbent material. The acid solution reacts with the carbonate species on the spent sorbent to release CO2 and restore the sorbent's active sites. This intermediary enables the transformation of consumed sorbent back into active form without requiring replacement of the sorbent material itself.
2Reliability
If CO2 is not chemically bound, then the process is simpler, but CO2 cannot be effectively removed or stabilized
Solution Approach 1:
The patent utilizes parameter changes in the form of pH adjustment through acid treatment to drive the chemical binding and release of CO2. During absorption, the sorbent binds CO2 under neutral/alkaline conditions. During regeneration, acidification changes the pH parameter to release CO2 and restore the sorbent. This parameter change enables effective CO2 binding and stabilization while keeping the process relatively simple through straightforward pH control.
Solution Approach 2:
The patent employs strong acid solutions as a chemical agent to accelerate the release of CO2 from the spent sorbent during regeneration. The acid reacts vigorously with the carbonate species on the sorbent, rapidly releasing CO2 gas and regenerating the sorbent material. This accelerated chemical reaction ensures effective CO2 binding and release while maintaining process efficiency.
3Reliability
If cost-intensive manmade resources are used, then CO2 can be effectively captured, but the process becomes economically unviable
Solution Approach 1:
The patent employs inexpensive acid solution (such as dilute sulfuric or hydrochloric acid) as the regeneration agent instead of costly specialized chemicals. The acid can be readily prepared from common industrial chemicals and is used in a cyclic manner, where the same acid solution can be regenerated and reused. This approach maintains effective CO2 capture while significantly reducing material costs compared to using expensive proprietary sorbents or reagents.
Solution Approach 2:
The patent implements a self-regenerating system where the sorbent material continuously cycles between absorption and regeneration modes without requiring external replacement. The acid treatment step regenerates the sorbent in situ, allowing the same sorbent material to be reused indefinitely. This self-service capability eliminates the need for continuous purchase of expensive sorbent materials, making the process economically viable while maintaining high CO2 capture effectiveness.
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 effectively reduces CO2 concentration by converting it into a stable carbonate salt, enabling easy isolation and avoiding the use of costly manmade resources, while maintaining the sorbent material's regeneratability, thus overcoming the limitations of existing methods.
Implementation Method 1
contacting the at least one ion exchange material of step a) with the at least one source of at least one cation of step c) such as to obtain a mixture comprising i) at least one ion exchange material, and ii) at least one earth alkali metal cation released from the at least one ion exchange material of step a)
Implementation Method 2
contacting the at least one earth alkali metal cation obtained in step f) with the at least one carbon dioxide-containing source of step b) such as to obtain a carbonate salt of the at least one earth alkali metal cation
Data Source
Figure 1
AI summary
The present invention relates to a method for reducing the amount of CO2 in a carbon dioxide-containing source by using a regeneratable ion exchange material .