Polymeric Sorbents for Selective CO2 Capture
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Solution Overview
Problem
Current methods for removing carbon dioxide from coal and natural gas production processes, such as pressure swing adsorption, face inefficiencies due to low selectivity and high energy costs, particularly in coal IGCC power plants and natural gas purification, where physical and chemical solvents have limitations in capturing CO2 effectively.
Innovation Solution
Development of polymeric sorbents derived from a divinylbenzene/maleic anhydride precursor material reacted with a nitrogen-containing compound, creating a porous material with covalently attached nitrogen groups that selectively adsorbs CO2 from gases like methane or hydrogen, enhancing CO2 capture efficiency and selectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If physical solvents are used for CO2 removal, then CO2 selectivity is high, but CO2 capture capacity per mass of sorbent is low
Solution Approach 1:
The invention uses composite polymeric sorbents combining SELEXOL physical solvent with functionalized polymer matrices (such as amine-functionalized polymers). This composite structure allows the material to exhibit both the high CO2 selectivity of physical solvents and enhanced capture capacity through the functional groups that increase CO2 affinity and solubility within the polymer matrix.
Solution Approach 2:
The invention modifies the physical and chemical parameters of the sorbent material by functionalizing the polymer with amine groups and optimizing the SELEXOL concentration within the polymer matrix. These parameter changes enable the sorbent to achieve higher CO2 capacity while maintaining selectivity, as the functional groups create additional CO2 binding sites without sacrificing the selective separation capability.
2Quantity of substance
If chemical solvents are used for CO2 removal, then CO2 capture capacity is high, but energy consumption for regeneration is high
Solution Approach 1:
The invention creates local regions within the polymeric sorbent where SELEXOL physical solvent is concentrated within the polymer matrix. These local regions provide strong CO2 affinity similar to chemical solvents but maintain the reversible, low-energy desorption characteristic of physical solvents. The functionalized polymer provides the local chemical environment for high capacity while the SELEXOL provides the reversible binding mechanism.
Solution Approach 2:
The polymeric sorbent acts as an intermediary between physical and chemical solvent mechanisms. The functionalized polymer matrix provides chemical interaction sites for high CO2 capacity, while the SELEXOL component provides reversible physical binding for low-energy regeneration. This intermediary structure combines advantages of both solvent types while avoiding their respective disadvantages.
3Measurement precision
If pressure swing adsorption is used for CO2 removal, then CO2 separation is effective, but operational complexity and cost are high
Solution Approach 1:
The invention uses homogeneous polymeric sorbent materials where the functionalized polymer and SELEXOL are integrated at the molecular level throughout the entire sorbent structure. This homogeneity provides consistent CO2 capture performance across the entire sorbent bed, simplifying the adsorption process and reducing the complexity of pressure swing operations compared to heterogeneous or multi-component systems.
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 polymeric sorbents demonstrate improved CO2 capture capacity and selectivity over other gases, with significant adsorption and desorption capabilities at varying pressures, reducing energy consumption and operational costs in CO2 removal processes.
Implementation Method 1
the polymeric sorbents are a reaction product of a divinylbenzene/maleic anhydride precursor polymeric material with a nitrogen-containing compound... that selectively adsorbs CO2 from gases like methane or hydrogen
Implementation Method 2
The nitrogen-containing compound is covalently attached to the resulting polymeric sorbent
Data Source
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AI summary
Polymeric sorbents for carbon dioxide are provided. More particularly, the polymeric sorbents are a reaction product of a divinylbenzene/maleic anhydride precursor polymeric material with a nitrogen-containing compound. The nitrogen-containing compound is covalently attached to the polymeric sorbents. Additionally, methods of sorbing carbon dioxide on the polymeric sorbents and compositions resulting from sorbing carbon dioxide on the polymeric sorbents are provided. The polymeric sorbents typically are porous and can selectively remove carbon dioxide from other gases such as methane or hydrogen.