Amine Functionalized Ionic Absorbent for CO2 Capture
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Solution Overview
Problem
Current carbon dioxide capture technologies, such as those using monoethanolamine (MEA), face limitations including oxidative degradation, thermal instability, and the need for continuous makeup, which increase costs and operational complexity, especially when dealing with flue gases containing high NOx and SOx.
Innovation Solution
An aqueous ionic absorbent solution with a cation and anion comprising an amine moiety, dissolved in a sufficient amount of diluent, is used to capture carbon dioxide, optimizing viscosity and molecular weight for efficient absorption and desorption, and featuring a molecular weight range that maximizes volumetric capacity and minimizes equipment size and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional amine solutions (MEA, DEA) are used for CO2 capture, then CO2 absorption capacity is achieved, but oxidative degradation and thermal instability occur leading to continuous makeup requirements
Solution Approach 1:
The patent changes the chemical parameters of the amine solution by using substituted amines with specific molecular weights (50-200 g/mol) and specific structural features (cyclic or acyclic with electron-donating groups). These parameter changes enhance the stability of the amine against oxidative degradation and thermal decomposition, thereby reducing the need for continuous makeup while maintaining CO2 absorption capacity.
Solution Approach 2:
The patent employs composite amine structures combining cyclic and acyclic components with specific functional groups. This composite approach creates a synergistic effect where the cyclic structure provides thermal stability and the acyclic substituted groups enhance CO2 reactivity and resistance to oxidative degradation, solving the reliability and substance loss contradiction.
2Productivity
If high concentration amine solutions are used to increase CO2 absorption capacity, then CO2 removal efficiency improves, but viscosity increases and equipment size must increase
Solution Approach 1:
The patent optimizes the molecular weight parameter of the amine (50-200 g/mol) and its concentration in the solution. This parameter optimization achieves high CO2 absorption capacity per unit volume while maintaining acceptable viscosity, thereby avoiding the need for oversized equipment. The specific molecular weight range ensures high reactivity with CO2 without excessive solution viscosity.
3Adaptability or versatility
If conventional amine solutions are used, then CO2 capture is achieved, but treatment of flue gases with high NOx and SOx becomes complex and costly
Solution Approach 1:
The patent changes the chemical parameters of the amine by introducing electron-donating substituents and using specific molecular weight ranges that enhance resistance to degradation by NOx and SOx. This parameter modification allows the solution to handle high NOx and SOx flue gases without requiring complex operational procedures or additional treatment systems, thereby improving adaptability while reducing operational complexity.
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 solution enables rapid and efficient carbon dioxide capture with improved volumetric capacity and reduced operational costs, overcoming the limitations of existing technologies by maintaining acceptable viscosity and stability across varying temperatures and gas compositions.
Implementation Method 1
The carbon dioxide absorption process is a unit operation where one or more components in a gas mixture are dissolved in a liquid (solvent). The absorption may either be a purely physical phenomenon or involve a chemical reaction, such as the reaction between carbon dioxide and an amine.
Implementation Method 2
the reaction between carbon dioxide and an amine
Implementation Method 3
The solvent is then led to a desorption process where the liquid is heated, and the carbon dioxide molecules are removed from the solvent by means of a desorption column
Implementation Method 4
carbon dioxide and water emerge from the amine solution and the water is separated by condensing the water vapor in a heat exchanger
Data Source
AI summary
An aqueous ionic absorbent solution is disclosed containing (a) about 15 wt. % to about 80 wt. % of one or more diluents, based on the total weight of the aqueous ionic absorbent solution; and (b) an ionic absorbent containing a cation and an anion comprising an amine moiety.