Supported Polyamine CO2 Sorbents With Low Volatility
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Solution Overview
Problem
Existing amine-based CO2 sorbents face challenges in balancing low cost, high sorption capacity, long operating lifetime, and resistance to oxidation and volatility, particularly when exposed to oxygen-containing gases.
Innovation Solution
A modified polyamine material is formed by reacting a low molecular weight polyamine with a multi-dentate linker in a controlled manner, resulting in a supported sorbent with reduced volatility and increased oxidation resistance while maintaining high CO2 sorption capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If low molecular weight polyamines are used as CO2 sorbents, then high sorption capacity is achieved, but volatility and oxidation resistance deteriorate
Solution Approach 1:
The patent creates a composite material by supporting low molecular weight polyamine on a porous support matrix. This composite structure allows the polyamine to maintain its high CO2 sorption capacity while the support provides mechanical stability and resistance to oxidation and volatility, thus resolving the contradiction between sorption capacity and reliability.
Solution Approach 2:
The patent utilizes porous support materials with specific pore size distributions to承载 the low molecular weight polyamine. The porous structure provides high surface area for polyamine deposition while the pore walls protect the polyamine from oxidation and volatility, enabling both high sorption capacity and improved reliability.
2Quantity of substance
If low molecular weight polyamines are used as CO2 sorbents, then high sorption capacity is achieved, but volatility increases
Solution Approach 1:
The porous support material physically confines the low molecular weight polyamine within its structure, preventing volatilization while maintaining the polyamine's accessibility to CO2 molecules. This resolves the contradiction between high sorption capacity and low volatility.
Solution Approach 2:
By forming a composite where polyamine is deposited on or within the porous support, the support acts as a matrix that anchors the polyamine, reducing its volatility while preserving its sorption functionality.
3Reliability
If cross-linking is increased to improve oxidation resistance, then stability improves, but CO2 sorption capacity decreases
Solution Approach 1:
The patent uses porous supports that provide physical protection against oxidation without requiring extensive cross-linking of the polyamine. The support structure itself offers stability, allowing the polyamine to remain relatively uncross-linked and maintain high CO2 sorption capacity while achieving good oxidation resistance through the support matrix.
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 material achieves a CO2 sorption capacity of 0.5 mmol/g or higher at 35°C and retains 60-85% of its capacity after exposure to cyclic oxidation conditions, offering improved stability and efficiency in CO2 capture processes.
Implementation Method 1
The supported modified polyamine material can have an equilibrium CO2 capacity of 0.5 mmol CO2/g polyamine or higher at 35° C. in the presence of 100 kPa CO2
Data Source
AI summary
Sorbent materials are provided with selectivity for sorption of CO2. The sorbent materials are formed by using a multi-dentate reagent to react with a relatively low molecular weight polyamine, such as a relatively low molecular weight polyethyleneimine (PEI). This forms a new modified polymer material that can be supported on a support material to provide a supported sorbent material. The amount of the multi-dentate reagent can be low enough so that only a reduced or minimized number of the nitrogen atoms in the polyamine are reacted during the cross-linking. The resulting modified polymer material can maintain the desirable sorption capacity of a lower molecular weight polyamine while having reduced volatility and/or while having and/or while still substantially maintaining a high CO2 sorption capacity for the resulting supported modified polyamine material.