Ionic Liquid CO2 Sorbents for Moisture-Swing Regeneration
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Solution Overview
Problem
Existing gas sorbents, such as carbon dioxide sorbents, face challenges in efficiently capturing and releasing CO2 while minimizing energy requirements, particularly in processes like Moisture Swing Adsorption (MSA), where the sorbent's responsiveness to humidity levels is critical.
Innovation Solution
A method of forming ionic liquids by combining heterocyclic compounds acting as Bronsted acid and base at room temperature, which are then infused into porous supports like metal-organic frameworks (MOFs) to create carbon dioxide sorbents that adsorb and release CO2 in response to moisture or temperature/pressure changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional gas sorbents are used for CO2 capture, then CO2 adsorption capacity is achieved, but energy requirements for CO2 release are high
Solution Approach 1:
The patent employs moisture swing adsorption that changes the operational parameter from temperature/pressure swing to humidity swing. The ionic liquid sorbent material changes its CO2 binding characteristics in response to humidity changes, allowing CO2 to be adsorbed in dry conditions and released in humid conditions, thereby reducing the energy required for the regeneration step.
Solution Approach 2:
The system utilizes ambient moisture from the air or process streams to drive the CO2 release process. Instead of requiring external heating energy, the sorbent self-regulates its CO2 binding affinity through exposure to environmental humidity, making the regeneration process energy-efficient and self-sustaining.
2Quantity of substance
If ionic liquids with high CO2 affinity are used, then CO2 adsorption capacity is improved, but responsiveness to humidity changes deteriorates
Solution Approach 1:
The patent uses composite ionic liquid materials that combine multiple functional components within the ionic liquid structure. These composite ionic liquids possess both high CO2 affinity through their chemical composition and high humidity responsiveness through their molecular structure design, simultaneously achieving both desired properties.
Solution Approach 2:
The ionic liquid is designed with specific local chemical environments that create regions of high CO2 affinity while maintaining overall humidity sensitivity. The molecular structure incorporates functional groups that locally bind CO2 strongly while the bulk material responds dynamically to humidity changes, achieving both high capacity and high adaptability.
3Quantity of substance
If complex ionic liquid formulations are used, then CO2 sorption performance is improved, but manufacturing complexity increases
Solution Approach 1:
The patent segments the ionic liquid formulation into modular functional components that can be independently selected and combined. This modular approach allows optimization of CO2 sorption performance through component selection while maintaining relatively simple manufacturing processes, as each component serves a specific function and can be sourced or synthesized separately.
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 ionic liquid-based carbon dioxide sorbents exhibit high hydrophilicity, proton conductivity, and enhanced CO2 adsorption capacity, with improved reactivity and sorption capacity due to the involvement of both positive and negative ions, achieving efficient CO2 capture and release.
Implementation Method 1
the carbon dioxide sorbent sorbs carbon dioxide upon contact with an air stream including carbon dioxide
Implementation Method 2
releases sorbed carbon dioxide upon contact with moisture or in response to a change in temperature and/or pressure
Implementation Method 3
combining at room temperature a first heterocyclic compound having at least one heteroatom in a first heterocycle ring and a second heterocyclic compound having at least one heteroatom in a second heterocycle ring, wherein the first heterocyclic compound acts as a Brønsted acid and the second heterocyclic compound acts as a Brønsted base in an acid-base reaction to form the ionic liquid
Data Source
AI summary
A method of forming an ionic liquid at room temperature combining a first heterocyclic compound having at least one heteroatom in a first heterocycle ring and a second heterocyclic compound having at least one heteroatom in a second heterocycle ring, wherein the first heterocyclic compound acts as a Brønsted acid and the second heterocyclic compound acts as a Brønsted base in an acid-base reaction to form the ionic liquid is disclosed. Furthermore, a carbon dioxide sorbent comprising the ionic liquid and a porous support is claimed. A method of forming the carbon dioxide sorbent comprising incorporating the ionic liquid in pores of a porous support is also disclosed.