Amino-Polymer Acidic Gas Adsorbent for Mild CO2 Desorption
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Solution Overview
Problem
Existing acidic gas adsorbents are inadequate for efficient adsorption and desorption under mild conditions, lacking suitable performance metrics for carbon dioxide capture and release.
Innovation Solution
Development of an acidic gas adsorbent comprising a polymer with a high nitrogen element density, specific surface area, and glass transition temperature, optimized for adsorption and desorption of carbon dioxide under mild conditions, integrated into a structure with an air flow path and adsorption device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional adsorbent materials are used, then the adsorbent can adsorb acidic gas by coming into contact with atmospheric air, but the adsorption and desorption cannot be performed efficiently under mild conditions
Solution Approach 1:
The patent changes the chemical composition parameters of the adsorbent by incorporating a polymer with amino groups and controlling the nitrogen element density to 12.0 mmol/g or more. This compositional parameter change enables the adsorbent to achieve high adsorption capacity (0.35 mmol/g or more) and desorption capacity (0.2 mmol/g or more) under mild temperature conditions (23°C for adsorption, 65°C for desorption), resolving the contradiction between mild temperature operation and efficient adsorption-desorption performance.
2Quantity of substance
If the nitrogen element density is increased to improve adsorption capacity, then the adsorption amount increases, but the desorption performance may be affected
Solution Approach 1:
The patent optimizes the nitrogen element density parameter to be 12.0 mmol/g or more, which provides sufficient adsorption sites for high adsorption capacity while maintaining the polymer structure's ability to release CO2 at mild temperatures. The specific polymer composition and amino group density are controlled to ensure both high adsorption amount (0.35 mmol/g or more) and adequate desorption performance (0.2 mmol/g or more at 65°C), resolving the contradiction between quantity of nitrogen and ease of desorption operation.
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 acidic gas adsorbent achieves high carbon dioxide adsorption and desorption efficiency under mild conditions, with improved adsorption capacity and desorption rates, suitable for carbon capture applications.
Implementation Method 1
an adsorption method in which acidic gas is caused to be adsorbed by an adsorbent to be separated
Implementation Method 2
an amine compound having a function of adsorbing acidic gas
Implementation Method 3
the acidic gas adsorbent after the adsorption test A1 is performed is heated at 65°C for 1.5 hours while the mixed gas is continuously fed into the container
Data Source
Figure 1
Figure 2A~2B
Figure 2C
AI summary
Provided is an acidic gas adsorbent suitable for adsorption and desorption of acidic gas under a relatively mild condition. The acidic gas adsorbent of the present invention includes a polymer P having an amino group. A density of nitrogen element in the acidic gas adsorbent is higher than 12.0 mmol/g. With respect to the acidic gas adsorbent, when an adsorption test A1 is performed, an adsorption amount a1 of carbon dioxide is 0.35 mmol/g or more. When a desorption test B1 is performed, a desorption amount b1 of carbon dioxide is 0.2 mmol/g or more.