Ionic Liquid CO2 Absorbent With Alcohol for Low-Energy Regeneration
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Solution Overview
Problem
Existing carbon dioxide absorbents, such as alkanolamine-based compounds, face issues with high regeneration energy requirements, environmental instability, and decomposition products that can cause atmospheric pollution, necessitating a more efficient and stable absorbent for carbon dioxide capture and desorption.
Innovation Solution
A carbon dioxide absorbent comprising an ionic liquid with an imidazole-based anion and an aliphatic alcohol is used, which forms carbamate and carbonate compounds, allowing for high carbon dioxide absorption and low-energy desorption, reducing atmospheric release of decomposition products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If alkanolamine-based compounds (MEA, DEA, MDEA) are used as carbon dioxide absorbents, then rapid reaction rate with carbon dioxide is achieved, but high regeneration energy is required due to high heat capacity of water
Solution Approach 1:
The patent changes the solvent parameter from water to ionic liquid, which has different thermal properties. The ionic liquid-based absorbent maintains rapid CO2 reaction kinetics while reducing the heat capacity effect that causes high regeneration energy requirements in aqueous amine solutions.
Solution Approach 2:
The patent creates a composite absorbent system combining ionic liquid with alkanolamine compounds. This composite approach allows the absorbent to achieve both rapid reaction kinetics from the amine component and reduced regeneration energy through the ionic liquid's thermal properties.
2Productivity
If amine-based absorbents are used, then carbon dioxide absorption is effective, but the absorbent is easily deteriorated or causes device corrosion by heat and oxygen
Solution Approach 1:
The patent develops a composite system where ionic liquid serves as the base medium and amine compounds are incorporated as active absorption components. This composite structure protects the amine from direct exposure to harsh conditions (heat and oxygen) while maintaining CO2 absorption effectiveness, thereby improving chemical stability and reducing corrosion.
Solution Approach 2:
The ionic liquid acts as an intermediary medium that facilitates CO2 absorption while protecting the amine compounds from direct contact with degrading factors like heat and oxygen. This intermediary role reduces deterioration and corrosion while maintaining absorption productivity.
3Productivity
If amine-based absorbents are used, then carbon dioxide capture is achieved, but decomposition products are released into the atmosphere causing environmental problems
Solution Approach 1:
The patent converts the potential harm of amine decomposition into a benefit by using ionic liquid as a protective medium. The ionic liquid stabilizes the amine compounds, preventing their decomposition into harmful atmospheric pollutants while maintaining the CO2 capture capability. Any decomposition that occurs is minimized and the ionic liquid itself serves as a more environmentally stable base.
4Productivity
If water is used as solvent in amine-based absorbents, then carbon dioxide absorption is effective, but high heat capacity requires high regeneration energy
Solution Approach 1:
The patent fundamentally changes the solvent parameter from water to ionic liquid. This parameter change reduces the heat capacity effect that dominates the energy balance during regeneration, thereby lowering the energy required to desorb CO2 while maintaining absorption performance through the ionic liquid's solvation properties.
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 capture performance with low regeneration energy and chemical stability, minimizing atmospheric pollution and decomposition product release.
Implementation Method 1
A carbon dioxide absorbent comprising an ionic liquid with an imidazole-based anion and an aliphatic alcohol is used, which forms carbamate and carbonate compounds
Implementation Method 2
which forms carbamate and carbonate compounds, allowing for high carbon dioxide absorption
Implementation Method 3
allowing for high carbon dioxide absorption and low-energy desorption
Data Source
AI summary
Provided is a carbon dioxide absorbent including an ionic liquid including an imidazole-based anion and an aliphatic alcohol. Since an alcohol solvent included in the carbon dioxide absorbent according to one embodiment has low toxicity and a very high boiling point, the carbon dioxide absorbent has no problem of release into the atmosphere and consequent environmental pollution, and is chemically stable to significantly lower the possibility of release of decomposition products into the atmosphere. In addition, the carbon dioxide absorbent is also effective, since it may absorb carbon dioxide with a higher equivalent than an absorbent input equivalent, and has low regeneration energy so that carbon dioxide is easily desorbed.