Polymeric Amine CO2 Adsorbent with Conductive Carbon Shell
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Solution Overview
Problem
Current carbon dioxide capture technologies, particularly post-combustion capture methods, face challenges with high energy consumption and low long-term stability due to deactivation of amine-based adsorbents at elevated temperatures, leading to reduced adsorption capacity and efficiency in industrial applications.
Innovation Solution
A carbon dioxide adsorbent is developed by modifying polyalkyleneimines with hydroxyethyl groups and supporting them on a porous substrate, along with a conductive carbon layer in a core-shell structure to enhance thermal stability and prevent particle aggregation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If amine-based adsorbents are used for carbon dioxide capture, then adsorption capacity is improved, but long-term stability deteriorates due to deactivation at elevated temperatures
Solution Approach 1:
The patent uses a composite structure combining polyethyleneimine (PEI) with silica support materials. The PEI provides high CO2 adsorption capacity through amine groups, while the silica support enhances thermal stability and prevents degradation at elevated temperatures during regeneration cycles, thus resolving the contradiction between adsorption capacity and long-term stability
Solution Approach 2:
The patent employs porous silica materials with controlled pore structures to support the polyethyleneimine. The porous structure provides high surface area for amine loading while maintaining structural integrity at high temperatures, enabling both high adsorption capacity and thermal stability during repeated adsorption-desorption cycles
2Quantity of substance
If polyethyleneimine is supported on porous support, then carbon dioxide adsorption capacity is improved, but particle aggregation occurs leading to operational problems
Solution Approach 1:
The patent applies a thin film or coating of conductive carbon material on the surface of the porous support particles. This carbon coating acts as a protective shell that prevents particle aggregation and static electricity accumulation while maintaining the high CO2 adsorption capacity of the underlying polyethyleneimine-silica structure
3Productivity
If conventional wet scrubbing with monoethanolamine is used, then carbon dioxide capture is effective, but energy consumption increases due to high regeneration temperatures
Solution Approach 1:
The patent modifies the chemical structure of the amine adsorbent by using polyethyleneimine with specific molecular weights and degrees of branching, supported on porous silica. This structural modification allows the adsorbent to maintain high CO2 capture efficiency while enabling regeneration at lower temperatures, thus reducing the energy consumption associated with the desorption process
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 modified adsorbent maintains high carbon dioxide adsorption capacity and selectivity throughout multiple adsorption-desorption cycles, addressing the issues of energy efficiency and long-term stability, while preventing particle aggregation and static electricity-related problems.
Implementation Method 1
a carbon dioxide adsorbent including: a polymeric amine consisting of a polymer skeleton containing nitrogen atoms and branched chains bonded to the nitrogen atoms of the polymer skeleton
Implementation Method 2
the polymeric amine is modified by substitution of at least one of the nitrogen atoms of the polymer skeleton or the branched chains with a hydroxyl group-containing carbon chain
Data Source
AI summary
Carbon dioxide adsorbents are provided. The carbon dioxide adsorbents include a polymeric amine and a porous support on which the polymeric amine is supported. the polymeric amine consists of a polymer skeleton containing nitrogen atoms and branched chains bonded to the nitrogen atoms of the polymer skeleton. Each of the branched chains contains at least one nitrogen atom, the polymeric amine is modified by substitution of at least one of the nitrogen atoms of the polymer skeleton or the branched chains with a hydroxyl group-containing carbon chain.