Multilayer Sorbent Stack for Low-Temperature Gas Separation Renewal
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Solution Overview
Problem
Carbon capture technologies face challenges with high regeneration temperatures, short sorbent lifetimes, and increased operating and maintenance costs due to the limitations of amine-based solvents, necessitating an improvement in gas adsorption capacity, ease of regeneration, and cyclic stability.
Innovation Solution
A multilayer sorbent stack with insulation layers separating sorbent layers is used, allowing for selective gas adsorption, degradation determination, and regeneration through thermal, pressure swing, vacuum, or electrical methods, with insulation layers being removed via external stimuli to expose fresh sorbent layers for continuous operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If amine-based solvent is used for CO2 capture, then CO2 absorption capacity is improved, but regeneration temperature increases and sorbent lifetime decreases
Solution Approach 1:
The sorbent material is divided into multiple layers with different functional properties. The first sorbent layer is optimized for CO2 absorption capacity, while the second sorbent layer is designed for easier regeneration at lower temperatures. This segmentation allows the system to achieve both high CO2 capture capacity and low regeneration temperature without compromising either aspect.
Solution Approach 2:
The invention uses a composite sorbent structure combining different sorbent materials in a layered configuration. The composite material leverages the advantages of each component: high CO2 affinity from the first layer and ease of regeneration from the second layer, thereby resolving the contradiction between absorption capacity and regeneration temperature.
2Quantity of substance
If amine-based solvent is used for CO2 capture, then CO2 absorption capacity is improved, but sorbent lifetime decreases
Solution Approach 1:
The sorbent system is segmented into multiple functional layers. The first layer handles CO2 absorption, while the second layer serves as a protective and regenerative layer that extends the overall system lifetime. This segmentation allows the high-capacity first layer to be replaced or regenerated without compromising the stability and lifetime of the entire sorbent system.
Solution Approach 2:
The invention enables selective regeneration or replacement of the first sorbent layer while maintaining the second sorbent layer. This allows the system to recover and reuse the stable second layer multiple times, effectively extending the overall sorbent lifetime while maintaining high CO2 absorption capacity through the first layer.
3Device complexity
If single-layer sorbent is used, then device complexity is reduced, but cyclic stability and operational lifetime are limited
Solution Approach 1:
The sorbent system is divided into multiple layers, each performing a specific function. This segmentation improves cyclic stability by allowing different layers to undergo regeneration at different stages, reducing the overall degradation rate and extending operational lifetime. The structured complexity of multiple layers is justified by the significant improvement in reliability and cyclic stability.
Solution Approach 2:
The composite multilayer sorbent structure combines materials with complementary properties to enhance cyclic stability. The interaction between different sorbent layers creates a synergistic effect that improves the overall reliability and operational stability, outweighing the increase in structural complexity.
4Ease of manufacture
If frequent sorbent replacement is required, then operational costs increase, but sorbent lifetime is short
Solution Approach 1:
The invention enables selective regeneration and reuse of the second sorbent layer, reducing the frequency of complete sorbent replacement. By recovering and regenerating the stable second layer multiple times, the system significantly reduces operational costs associated with frequent sorbent replacement while extending the effective lifetime of the sorbent system.
Solution Approach 2:
The multilayer sorbent structure is designed to be self-regenerating, where the second layer facilitates the regeneration of the first layer. This self-service mechanism reduces the need for external intervention and frequent replacements, thereby lowering operational costs and extending sorbent lifetime simultaneously.
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
This approach extends sorbent lifetime, reduces downtime, and maintains efficient gas separation by alternating active sorbent layers, thereby lowering operational costs and enhancing the continuous capture of gases like CO2, CO, CH4, and other pollutants.
Implementation Method 1
contacting the feed gas stream with a first sorbent layer in the multilayer sorbent stack, where the first sorbent layer selectively adsorbs a gas from the feed gas stream
Implementation Method 2
removing the first insulation layer by an external stimulus
Implementation Method 3
removing the first insulation layer by an external stimulus
Implementation Method 4
regenerating the first sorbent layer from the multilayer sorbent stack to release the gas adsorbed
Data Source
AI summary
A multilayer composite sorbent stack is used for gas separation. A gas feed stream is fed into a vessel that includes the multilayer composite sorbent stack. The multilayer composite sorbent stack includes several sorbent layers alternated with insulation layers, such that the insulation layer is placed between two sorbent layers. The active sorbent layer selectively adsorbs a specific gas molecule from the gas feed stream. Upon determining that the active sorbent layer is saturated with the adsorbed gas molecule, the active sorbent layer is regenerated to release the adsorbed gas molecule. If the active sorbent layer degrades or underperforms due to gas saturation, the insulation layer beneath the active sorbent layer is partially or completely exfoliated, thereby exposing the next sorbent layer to the incoming gas feed stream to continue the selective adsorption or desorption process.