Porogen-Formed Acidic Gas Adsorbent Sheets for CO2 Diffusion
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Solution Overview
Problem
Existing methods for producing sheet-shaped acidic gas adsorbents often result in a dense skin layer that impairs gas diffusion and reduces adsorption and desorption efficiency.
Innovation Solution
A production method involving a mixed solution of a compound with a primary amino group and an epoxy group, along with a porogen, where the equivalent of the primary amino group exceeds that of the epoxy group, followed by cooling and curing to form a sheet-shaped cured body, then removing the porogen, to create a porous structure with minimal surface dense layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a sheet-shaped adsorbent is produced using conventional methods, then the adsorbent structure is formed, but a dense skin layer is created at the surface that reduces acidic gas diffusion and adsorption-desorption ability
Solution Approach 1:
The invention changes the chemical composition parameters by using a mixed solution containing a compound with primary amino groups, a compound with epoxy groups, and a porogen in specific equivalent ratios (epoxy equivalent 0.05-0.50 relative to primary amino groups). This compositional parameter change prevents dense skin layer formation while maintaining structural integrity, resolving the contradiction between structure formation and gas diffusion capability
Solution Approach 2:
The invention incorporates a porogen in the mixed solution that creates a porous structure within the adsorbent sheet. The porogen forms voids and channels that facilitate acidic gas diffusion throughout the material, preventing the formation of a dense skin layer while maintaining the overall sheet structure, thus improving adsorption-desorption ability
2Strength
If the equivalent of epoxy group is increased to improve crosslinking, then the structural strength increases, but the adsorption capacity decreases due to reduced amino group availability
Solution Approach 1:
The invention optimizes the equivalent ratio parameter by maintaining epoxy equivalent between 0.05-0.50 relative to primary amino groups. This parameter setting ensures sufficient crosslinking for structural strength while preserving adequate amino group availability for acidic gas adsorption, resolving the contradiction between strength and adsorption capacity
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 method produces an acidic gas adsorbent sheet with enhanced adsorption capacity and desorption efficiency, achieving carbon dioxide adsorption over 0.4 mmol/g and desorption rate greater than 80% under specified conditions.
Implementation Method 1
reacting the compound C1 and the compound C2 to obtain a reaction product
Implementation Method 2
removing the porogen from the sheet-shaped cured body
Implementation Method 3
an adsorption amount of carbon dioxide from start of the test to 1 hour after the start of the test is greater than 0.4 mmol/g
Implementation Method 4
a desorption rate of carbon dioxide is greater than 80%, the acidic gas adsorbent sheet after the adsorption test A1 is performed is heated at 50°C for 15 hours
Data Source
Figure 1
Figure 2~3
Figure 4A~4B
AI summary
A production method for an acidic gas adsorbent sheet of the present invention includes: a step (I) of, in a mixed solution including a compound C1 having a primary amino group, a compound C2 having an epoxy group, and a porogen and having an equivalent of the primary amino group greater than an equivalent of the epoxy group, reacting the compound C1 and the compound C2 to obtain a reaction product; a step (II) of cooling the mixed solution including the reaction product, then adding the compound C2 to the mixed solution, and reacting the reaction product and the compound C2 to obtain a reaction solution; a step (III) of curing the reaction solution to obtain a sheet-shaped cured body; and a step (IV) of removing the porogen from the sheet-shaped cured body. An acidic gas adsorbent sheet of the present invention includes a polymer having an amino group. When an adsorption test A1 is performed, an adsorption amount of carbon dioxide from start of the test to 1 hour after the start of the test is greater than 0.4 mmol/g, and when a desorption test B1 is performed, a desorption rate of carbon dioxide is greater than 80%.