Porous Acidic Gas Adsorbent Sheet Without Surface Skin Layer
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Solution Overview
Problem
The formation of a dense skin layer on the surface of sheet-shaped adsorbents impedes the diffusion of acidic gases, affecting their ability to adsorb and desorb effectively.
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, is used to create a reaction product, which is cooled and further reacted to form a reaction solution, then cured to form a sheet-shaped body, with the porogen subsequently removed, ensuring a porous structure.
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 formed at the surface which impedes acidic gas diffusion
Solution Approach 1:
The invention uses a porogen (such as water, alcohol, or organic solvent) incorporated into the adsorbent matrix during the curing process. This porogen creates a porous structure throughout the adsorbent, including at the surface, preventing the formation of a dense skin layer. The pores allow acidic gas to diffuse freely into the interior of the adsorbent, resolving the contradiction between forming a structured adsorbent and preventing skin layer formation.
Solution Approach 2:
The invention changes the chemical composition parameters of the mixed solution by incorporating a porogen alongside the epoxy compound and amine compound. This parameter change in the solution composition leads to phase separation or pore formation during curing, creating a porous structure that prevents skin layer formation while maintaining adsorbent functionality.
2Strength
If the skin layer thickness increases, then the structural integrity of the adsorbent is maintained, but the ability to adsorb and desorb acidic gas decreases
Solution Approach 1:
By incorporating a porogen into the adsorbent matrix, the invention creates a porous structure that maintains structural integrity while providing pathways for gas diffusion. The porous network distributes mechanical stress throughout the material, preventing the formation of a dense, impermeable skin layer that would hinder gas transport.
Solution Approach 2:
The adsorbent is formed as a composite material containing the polymer matrix (from epoxy and amine reactions) and the porogen phase. This composite structure combines the mechanical strength of the polymer network with the gas transport properties of the porous structure, achieving both structural integrity and high gas adsorption/desorption capability.
3Manufacturing precision
If the equivalent of primary amino group is greater than epoxy group in the mixed solution, then the reaction product forms properly, but controlling the reaction to prevent skin layer formation becomes difficult
Solution Approach 1:
The porogen acts as an intermediary substance in the mixed solution that mediates the reaction between the amine and epoxy compounds. It controls the reaction kinetics and heat distribution, preventing runaway reactions that could lead to skin layer formation while ensuring complete reaction of the functional groups.
Solution Approach 2:
The invention changes the physical and chemical parameters of the reaction system by adding the porogen, which modifies the viscosity, heat capacity, and reaction rate of the mixed solution. These parameter changes make the reaction easier to control and prevent the formation of a dense skin layer during curing.
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 results in an acidic gas adsorbent sheet with improved adsorption and desorption capabilities, achieving an adsorption amount greater than 0.4 mmol/g and a desorption rate greater than 80% for carbon dioxide.
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
the acidic gas adsorbent sheet after the adsorption test A1 is performed is heated at 50° C. for 15 hours while the mixed gas is continuously fed into the container
Data Source
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.