Temperature Swing Adsorption Process with Pre-Heating and Pre-Cooling
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Solution Overview
Problem
Current temperature swing adsorption (TSA) processes for separating target components from gaseous mixtures, such as carbon dioxide from flue gas, face challenges including low separation performance, high energy consumption, and high capital costs, due to inefficient adsorbent regeneration and drying processes.
Innovation Solution
A modified TSA process involving multiple reactors with pre-cooling and pre-heating steps, where partially regenerated adsorbent is contacted with waste streams from other reactors to enhance adsorption and desorption efficiency, and the use of specific adsorbents like MOFs for selective CO2 capture over water and nitrogen, with optimized heating and cooling protocols to reduce energy input and increase productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional TSA process is used with simple heating and cooling steps, then the process is easy to operate, but separation performance is low with low recovery and low purity of target product
Solution Approach 1:
The TSA process is segmented into five distinct steps: adsorption, pre-heating, heating, pre-cooling, and cooling. This segmentation allows each step to be optimized independently, with pre-heating and pre-cooling steps specifically added to improve separation performance by preparing the adsorbent before main treatment and removing residual contaminants after main treatment.
Solution Approach 2:
Pre-heating and pre-cooling steps are introduced as preliminary actions before the main heating and cooling steps. The pre-heating step prepares the adsorbent bed for efficient target component release, while pre-cooling removes residual target component after desorption, both improving overall separation performance without significantly complicating operation.
2Manufacturing precision
If conventional TSA process is used with extended heating and cooling steps to improve separation performance, then recovery and purity improve, but energy input increases significantly
Solution Approach 1:
The pre-heating step merges the functions of heating the adsorbent bed and desorbing some target component, while the pre-cooling step merges cooling the adsorbent bed and removing residual target component. This combining of functions reduces the energy required in the main heating and cooling steps, lowering overall energy input while maintaining high separation performance.
Solution Approach 2:
The five-step process ensures continuous useful action throughout the cycle, with each step preparing for the next. The pre-heating step begins target component release before main heating, and pre-cooling removes residual components before final cooling, maximizing the efficiency of energy utilization and reducing total energy input required for achieving high recovery and purity.
3Device complexity
If conventional TSA process is used with standard heating and cooling rates, then the process is simple, but productivity is low resulting in high capital cost
Solution Approach 1:
Dividing the process into five steps with specific time allocations (adsorption: 30-180s, pre-heating: 10-60s, heating: 60-300s, pre-cooling: 10-60s, cooling: 60-300s) optimizes the cycle time while maintaining operational simplicity. This segmentation allows parallel operations in multiple reactors to be coordinated efficiently, increasing overall productivity without significantly increasing process complexity.
Solution Approach 2:
The process uses periodic action with multiple reactors operating in different phases of the five-step cycle. By synchronizing the cycles of multiple reactors, the system achieves continuous high productivity while maintaining the simplicity of the basic process steps, as each reactor follows the same periodic sequence.
4Manufacturing precision
If chemical scrubbing is used instead of TSA, then separation performance can be high, but the solution is toxic, harmful and requires frequent replacement increasing operational cost
Solution Approach 1:
The adsorbent used in TSA is a solid material that can be reused for many cycles without degradation, replacing the need for frequent replacement of liquid absorbent solutions. This eliminates the toxicity and environmental harm associated with chemical scrubbing solutions while maintaining high separation performance through repeated use of the same adsorbent material.
Solution Approach 2:
The adsorbent in TSA is regenerated in situ through the heating and cooling steps, eliminating the need for external regeneration facilities or disposal of spent absorbent solutions. The process is self-service, with the adsorbent automatically regenerated by the thermal cycling process, avoiding the harmful waste streams generated by chemical scrubbing.
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 process achieves high purity and recovery of target components with reduced energy consumption and lower capital costs, enabling efficient CO2 capture for industrial applications while minimizing environmental impact.
Implementation Method 1
a solid adsorbent which is selective for the target component over the at least one side component and over water
Implementation Method 2
a heating step of the loaded adsorbent during which the target component is released from the adsorbent bed
Implementation Method 3
a cooling step during which the adsorbent is cooled back to the adsorption temperature
Data Source
AI summary
A temperature swing adsorption (TSA) process for removing a target component from a gaseous mixture, where the process is carried out in a plurality of reactors. Each reactor performs the following steps: an adsorption step wherein an input stream of said gaseous mixture is contacted with a solid adsorbent selective for said target component, producing a first waste stream depleted of the target component; a heating step for regeneration of the loaded adsorbent providing a first output stream containing the target component; and a cooling step of the regenerated adsorbent.