Two-Stage CO2 Purification Adsorption for Water and Impurity Removal
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Solution Overview
Problem
Industrial processes face challenges in efficiently capturing and purifying carbon dioxide (CO2) by removing impurities such as water and other contaminants, which can lead to unwanted side reactions and reduced CO2 recovery due to the use of single temperature swing adsorption (TSA) systems.
Innovation Solution
A two-stage temperature swing adsorption (TSA) system is employed, where a first adsorbent bed selectively removes water, followed by a second adsorbent bed that removes other impurities, with separate regeneration methods for each bed to minimize side reactions and enhance CO2 recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single TSA system is used to remove impurities, then the system complexity is reduced, but side reactions occur and CO2 recovery decreases
Solution Approach 1:
The single TSA system is divided into two separate TSA systems: a first TSA system for removing water and a second TSA system for removing other impurities. This segmentation allows each system to be optimized for its specific function, preventing side reactions that would occur in a single system while maintaining manageable complexity through modular design.
2Manufacturing precision
If a first TSA system is used to remove water, then water removal efficiency is improved, but the spent regeneration gas requires additional management
Solution Approach 1:
The spent regeneration gas from the first TSA system is merged with the feed stream to the first TSA system after undergoing phase change (condensation of water). This combining approach reuses the regeneration gas containing water vapor, eliminating the need for separate disposal systems and reducing overall system complexity despite the added regeneration management requirement.
3Duration of action of stationary object
If separate regeneration methods are used for each adsorbent bed, then adsorbent lifetime is extended, but the process complexity increases
Solution Approach 1:
Each adsorbent bed is assigned a specialized regeneration method tailored to its specific function: the first TSA system uses a regeneration process optimized for water removal, while the second TSA system uses a regeneration process optimized for removing other impurities. This local optimization extends adsorbent lifetime by preventing cross-contamination and side reactions, while the modular structure keeps process complexity manageable.
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 two-stage TSA system achieves high CO2 recovery rates exceeding 95%, reduces the need for regeneration gas, and minimizes unwanted side reactions by separating water removal from impurity removal, thereby extending adsorbent lifetime and optimizing process efficiency.
Implementation Method 1
passing a feed stream comprising carbon dioxide, water, and one or more impurities over a first lean adsorbent bed to produce a dehydrated stream depleted in water
Implementation Method 2
passing the dehydrated stream over a second lean adsorbent bed to produce a carbon dioxide product stream depleted in the one or more impurities
Implementation Method 3
passing a first regeneration gas stream over the first rich adsorbent bed to produce a first spent regeneration gas stream enriched in water
Implementation Method 4
an optional condensation step to remove water
Data Source
AI summary
A method may include passing a feed stream including carbon dioxide, water and one or more impurities over a first lean adsorbent bed to produce a dehydrated stream depleted in water and a first rich adsorbent bed enriched in water. The method may also include passing the dehydrated stream over a second lean adsorbent bed to produce a carbon dioxide product stream depleted in the one or more impurities and a second rich adsorbent bed enriched in the one or more impurities. The method may further include passing a first regeneration gas stream over the first rich adsorbent bed to produce a first spent regeneration gas stream enriched in water; and combining the first spent regeneration gas stream or a stream derived from the first spent regeneration gas stream with the feed stream.