Amidium Ionic Liquid CO2 Absorption
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Solution Overview
Problem
Current carbon dioxide absorbents, such as aqueous amine-based solutions and organic solvents, face issues like irreversible decomposition, high energy requirements, and high manufacturing costs, as well as inefficiencies in CO2 absorption and circulation rates, leading to equipment size and operational challenges.
Innovation Solution
An amidium-based ionic liquid is developed, synthesized by reacting amides and organic acids, offering high CO2 absorption capability, thermal and chemical stability, low viscosity, and reduced manufacturing costs, allowing for efficient CO2 separation from mixed gases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If aqueous amine-based solutions are used as CO2 absorbents, then CO2 absorption capability is improved, but the absorbent undergoes irreversible decomposition and requires periodic replacement
Solution Approach 1:
The patent changes the chemical parameters of the absorbent by using amidium-based ionic liquids with specific structural parameters (R1: C1-C8 alkyl or C5-C15 aryl, R2: C1-C6 alkyl or C5-C15 aryl, R3: C1-C6 alkyl, C1-C6 haloalkyl or C5-C15 aryl). These parameter modifications provide both high CO2 absorption capability and resistance to decomposition, resolving the contradiction between absorption performance and stability.
2Quantity of substance
If amine-based absorbents are used, then CO2 absorption is enhanced, but high energy is required for CO2 recovery and solvent recycling
Solution Approach 1:
The patent modifies the physical-chemical parameters of the absorbent system by employing ionic liquids with tailored molecular structures. The specific parameter ranges for R1, R2, and R3 groups optimize the balance between CO2 absorption capability and the energy required for recovery, reducing the energy intensity compared to conventional amine-based systems.
3Use of energy by moving object
If organic solvents are used for physical CO2 absorption, then energy requirement for CO2 recovery is reduced, but CO2 absorption capability is significantly lowered
Solution Approach 1:
The patent creates a composite-type absorbent system using amidium-based ionic liquids that combine characteristics of both chemical and physical absorption mechanisms. The specific molecular structure parameters (R1-C8 alkyl or C5-C15 aryl, R2-C6 alkyl or C5-C15 aryl, R3-C6 alkyl, C1-C6 haloalkyl or C5-C15 aryl) enable the material to achieve high CO2 absorption capability while maintaining low energy requirements for recovery, effectively combining the advantages of both approaches.
4Use of energy by moving object
If physical absorption with organic solvents is used, then CO2 recovery energy is reduced, but circulation rate must be doubled requiring larger equipment
Solution Approach 1:
The patent optimizes the physical-chemical parameters of the ionic liquid absorbent to achieve high CO2 loading capacity. The specific parameter ranges for the R groups in the amidium structure enhance the absorbent's effectiveness, allowing for reduced circulation rates and smaller equipment sizes while maintaining low energy requirements for CO2 recovery.
5Quantity of substance
If conventional absorbents are used, then CO2 absorption is achieved, but manufacturing costs are high due to complex synthesis processes
Solution Approach 1:
The patent defines specific parameter ranges for the amidium-based ionic liquid structure (R1: C1-C8 alkyl or C5-C15 aryl, R2: C1-C6 alkyl or C5-C15 aryl, R3: C1-C6 alkyl, C1-C6 haloalkyl or C5-C15 aryl) that balance CO2 absorption performance with ease of synthesis and manufacturing cost, making the absorbent economically viable for industrial application.
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 amidium-based ionic liquid demonstrates superior CO2 absorption efficiency, reduced energy requirements for CO2 stripping, and minimal hydrocarbon absorption, maintaining absorption capability over repeated use, thus addressing the limitations of existing absorbents.
Implementation Method 1
CO2 absorption is proceeded via physical interaction between the solvent and CO2, not by the chemical bond as in the case of the aqueous amine-based absorbents
Data Source
AI summary
The present invention relates to a carbon dioxide absorbent, an ionic liquid obtained by reacting amide and an organic acid and a method of using the same. The amidium-based ionic liquid of the present invention has excellent CO2 absorption capability, which is hardly reduced even with repeated use, is easy to synthesize and has low manufacturing cost thus being useful as a CO2 absorbent.