Amine-Porous Substrate Structure for Low-Temperature CO2 Desorption
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Solution Overview
Problem
Conventional carbon-dioxide-absorbing materials using porous substrates with mesopores have low amine compound utilization and low desorption rates at low temperatures, leading to increased heating costs for efficient desorption.
Innovation Solution
A gas absorbent-supporting porous substrate with a composition containing amine compounds and polyethers, optimized pore ratios and volumes of macropores and mesopores, maintaining high flowability and enhancing gas absorption and desorption rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a porous substrate including mesopores is used to support amine compounds for carbon dioxide absorption, then the gas absorbent can be supported in the pores, but the amount of amine compound that contributes to carbon dioxide absorption capability is small relative to the total amount of amine compound supported
Solution Approach 1:
The patent applies local quality by creating distinct pore regions with different functions: macropores (0.03-10 μm) serve as transport channels for gas flow, while mesopores (2-50 nm) provide absorption sites. The amine compound is selectively positioned in macropores where it has sufficient mobility to contribute to absorption, rather than being distributed throughout all pores including mesopores where mobility is restricted.
Solution Approach 2:
The patent segments the pore structure into two distinct size categories with different functions: macropores for transport and amine compound positioning, and mesopores for structural support. This segmentation allows the amine compound to be located in the appropriate pore size range (macropores) where it can effectively contribute to carbon dioxide absorption capability.
2Reliability
If a porous substrate with mesopores is used for gas absorption, then the amine compound can be supported, but the desorption rate of absorbed gas is low at low temperatures, leading to increased heating costs
Solution Approach 1:
The patent changes the physical parameters of the pore structure, specifically the size distribution and volume ratios of macropores and mesopores. By optimizing the macropore volume ratio (0.4-0.8 mL/g) and mesopore volume ratio (0.05-0.4 mL/g), and controlling the modal pore sizes, the patent achieves a pore structure that enables high desorption rates at low temperatures through improved gas transport and amine compound mobility.
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 substrate achieves high gas absorption capacity and efficient desorption at low temperatures, reducing heating costs and maintaining amine compound effectiveness.
Implementation Method 1
a carbon-dioxide-absorbing material composed of a porous material and an amine compound supported thereon
Implementation Method 2
a porous substrate which has pores including at least macropores and mesopores; and a gas absorbent supported in at least some of the pores
Data Source
Figure 1
AI summary
A gas absorbent-supporting porous substrate including: a porous substrate including at least macropores; and a gas absorbent supported in at least some pores in the porous substrate. The gas absorbent is a composition containing an amine compound and a polyether. The ratio, Vsa/Vs, of Vsa to Vs is 0.60 or less, where Vs is a pore volume of the mesopores in the porous substrate, and Vsa is a pore volume of the mesopores in the gas absorbent-supporting porous substrate. The ratio, Vma/Vm, of Vma to Vm is 0.50 or greater, where Vm is a pore volume of the macropores in the porous substrate, and Vma is a pore volume of the macropores in the gas absorbent-supporting porous substrate.