Modified Polyamine Sorbent on Nano-Structured Supports for CO2 Capture
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Solution Overview
Problem
Current CO2 capture technologies face challenges such as high energy consumption for regeneration, corrosion issues, and limited CO2 absorption capacity, particularly in amine solution-based systems and solid sorbents, which hinder efficient and economical carbon dioxide removal from gas mixtures at various temperatures.
Innovation Solution
A modified polyamine sorbent is developed, comprising a reaction product of an amine and an aldehyde, supported on nano-structured materials like silica or alumina, which enhances CO2 absorption and desorption capabilities, allowing for efficient capture and separation of CO2 at ambient and elevated temperatures, and is regenerable through heat, pressure, or gas purge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If amine solution-based systems are used for CO2 capture, then CO2 absorption rate is improved, but energy consumption for regeneration increases
Solution Approach 1:
The patent uses porous solid supports (such as porous polymers, silica, alumina, or zeolites) to carry the amine functional groups. This porous structure provides high surface area for CO2 absorption while enabling easier mass transfer and lower regeneration temperatures compared to bulk liquid amine solutions, thus resolving the contradiction between high absorption rate and low energy consumption.
Solution Approach 2:
The patent modifies the physical state of the amine system from liquid solution to solid-supported material, and adjusts the pKa and loading capacity parameters of the amine groups. This allows optimization of both absorption kinetics and regeneration energy requirements by controlling amine concentration, pore size, and support surface area.
2Quantity of substance
If high concentration amine solutions are used to increase CO2 loading capacity, then CO2 absorption capacity is improved, but corrosion and chemical degradation worsen
Solution Approach 1:
By using porous solid supports with controlled pore sizes and surface areas, the patent achieves high CO2 loading capacity through increased surface area for amine attachment, rather than increasing amine concentration in solution. This eliminates corrosion issues while maintaining high capacity.
Solution Approach 2:
The patent creates composite materials combining amine-functionalized porous supports with appropriate pore structures. This composite approach allows high amine loading (e.g., 2-5 mmol/g) on the solid support without the corrosive effects of concentrated liquid amine solutions, as the amine groups are immobilized on the porous matrix.
3Reliability
If water is used as the main component of amine solution to prevent corrosion, then corrosion is reduced, but energy waste during regeneration increases
Solution Approach 1:
The patent uses porous solid supports to carry the amine groups, eliminating the need for water as a solvent. The porous structure provides sufficient surface area for high CO2 capacity without requiring large amounts of water, thus avoiding the energy waste of heating and evaporating water during regeneration while still preventing corrosion.
4Reliability
If physical adsorbents are used for CO2 separation, then selectivity is improved, but absorption capacity at elevated temperatures deteriorates
Solution Approach 1:
The patent changes the interaction mechanism from physical adsorption to chemical absorption by introducing amine functional groups on the porous support. The amine groups form carbamate or bicarbonate species with CO2 through chemical reactions, providing both high selectivity and maintained capacity at elevated temperatures, unlike pure physical adsorbents.
Data Source
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AI summary
The invention relates to regenerative, solid sorbent for adsorbing carbon dioxide from a gas mixture, with the sorbent including a modified polyamine and a nano-structured solid support. The modified polyamine is the reaction product of an amine and an aldehyde. The sorbent provides structural integrity, as well as high selectivity and increased capacity for efficiently capturing carbon dioxide from gas mixtures, including the air. The sorbent is regenerative, and can be used through multiple operations of absorption-desorption cycles.