Modified Polyamine Sorbents 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 adsorption capacity, especially at elevated temperatures and in the presence of moisture, due to the volatility and chemical degradation of amine-based solutions and solid sorbents.
Innovation Solution
A modified polyamine is reacted with an epoxide to form a crosslinked amine, which is then deposited on a nano-structured support, enhancing CO2 adsorption and desorption characteristics by increasing molecular weight and stability, while maintaining amine functionalities for efficient CO2 capture and separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If aqueous amine solutions (MEA, DEA, DIPA) are used for CO2 absorption, then CO2 absorption rate is improved, but heat of regeneration and energy consumption increase significantly
Solution Approach 1:
The patent uses porous solid supports (silica gel, activated carbon, zeolites, alumina) with high surface area to immobilize amine groups. This provides large contact area for CO2 absorption while enabling easier thermal regeneration compared to bulk aqueous solutions, resolving the contradiction between fast absorption and energy-intensive regeneration
Solution Approach 2:
The patent creates composite materials by combining amine functional groups with porous solid supports. This composite structure maintains the high CO2 reactivity of amines while incorporating the advantageous thermal properties and structural stability of porous solids, achieving both fast absorption and reduced regeneration energy
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 immobilizing amines on porous solid surfaces, the patent achieves high CO2 loading capacity through the large surface area available for amine attachment, while the solid support structure prevents the corrosion and degradation issues associated with concentrated bulk amine solutions
Solution Approach 2:
The solid supported amine sorbents are designed to be stable and reusable over multiple cycles, eliminating the need for continuous replacement due to corrosion or degradation, thus improving reliability while maintaining high capacity
3Quantity of substance
If physical adsorbents (silica gel, activated carbon, zeolites) are used at room temperature, then CO2 absorption capacity is improved, but selectivity and separation efficiency decrease
Solution Approach 1:
The patent combines physical adsorbents with chemically active amine groups to create composite sorbents. This provides both the high capacity of physical adsorbents and the high selectivity of chemical amines, as the amine groups preferentially react with CO2 over other gases
Solution Approach 2:
The patent introduces chemically active amine sites at specific locations on the porous support surface. These localized active sites provide high selectivity for CO2 while the overall porous structure maintains high absorption capacity, achieving both goals simultaneously
4Manufacturing precision
If amine groups are deposited on solid supports to achieve chemical absorption, then CO2 selectivity is improved, but adsorption capacity decreases
Solution Approach 1:
The patent uses porous solid supports with very high surface area to area ratios. This allows deposition of sufficient amine groups to achieve high selectivity while the porous structure provides large volume for gas diffusion and access, maintaining high adsorption capacity
Solution Approach 2:
The patent transitions from surface-only deposition to utilizing the three-dimensional porous network of the support. This allows amine groups to be distributed throughout the pore structure, increasing total capacity while maintaining the selectivity benefits of chemical absorption
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 polyamine sorbent exhibits high CO2 selectivity and removal capacity at ambient and elevated temperatures, allowing for efficient capture and separation of CO2 from various gas mixtures, with easy regeneration and minimal loss of activity over multiple cycles, addressing the limitations of prior art.
Implementation Method 1
A modified polyamine is reacted with an epoxide to form a crosslinked amine
Implementation Method 2
Amine-functionalized solid supports for the selective capture and separation of carbon dioxide from gas mixtures
Implementation Method 3
allowing for efficient capture and separation of CO2 from various gas mixtures, with easy regeneration
Data Source
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AI summary
The invention relates to regenerative, solid sorbents for adsorbing carbon dioxide from a gas mixture, including air, with the sorbent including a modified polyamine and a solid support. The modified polyamine is the reaction product of an amine and an epoxide. 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 cycles of adsorption-desorption.