Direct Air Capture Reactor With Reversible Sorbent Regeneration
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Solution Overview
Problem
Existing carbon processing systems are inefficient and require significant processing volume, limiting their scalability and effectiveness in capturing carbon dioxide from ambient air.
Innovation Solution
A carbon processing system utilizing a multi-stage reactor with a base solution that undergoes reversible absorption and desorption reactions, facilitated by an air mover, to capture and regenerate carbon dioxide efficiently, using quaternary ammonium cations and anions, along with phase transfer catalysts and corrosion inhibitors, to achieve scalable and low-volume processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional carbon processing techniques are used, then carbon dioxide can be captured from flue gases, but the processing volume required is significant and scalability is limited
Solution Approach 1:
The patent changes the concentration parameter of CO2 by transitioning from processing high-concentration flue gases to processing ambient air with low CO2 concentration (400 ppm). This parameter change enables the development of a more compact system with higher surface area to volume ratio heat exchangers and optimized contactors that are specifically designed for low-concentration CO2 capture, thereby reducing overall processing volume while maintaining capture efficiency
Solution Approach 2:
The carbon capture process is segmented into distinct functional modules: CO2 absorption section, desorption section, and regeneration section. Each module is optimized independently with specific equipment (absorbers, contactors, heat exchangers) that can be scaled modularly. This segmentation allows the system to achieve high productivity in each module while keeping individual component volumes small, enabling overall system scalability without requiring excessively large processing volumes
2Extent of automation
If manual or semi-automated processes are used, then operational control is possible, but automation capabilities and scalability are reduced
Solution Approach 1:
The system incorporates self-regulating mechanisms where the CO2-rich base solution automatically flows to the desorption section after absorption, and the regenerated base solution automatically returns to the absorption section. The phase transfer catalyst automatically facilitates CO2 release without external intervention. This self-service operation reduces the need for complex control systems while maintaining high automation capabilities, as the process regulates itself through inherent chemical and physical principles
Solution Approach 2:
The system continuously cycles the base solution through absorption of CO2, desorption to release pure CO2, and regeneration to restore the base solution. This continuous recovery and reuse of the base solution creates a closed-loop system that is inherently automated and scalable. The cyclic nature of the process allows for standardized modular units that can be replicated and scaled without proportionally increasing system complexity
3Productivity
If base solution is not regenerated, then continuous processing is possible, but the solution cannot be reused and processing efficiency decreases
Solution Approach 1:
The system maintains continuous useful action by implementing a closed-loop base solution cycle. The base solution continuously absorbs CO2 in the absorption section, then transports to the desorption section where CO2 is released, and the regenerated base solution automatically returns to absorption. This continuous cycling without interruption ensures uninterrupted CO2 capture productivity while eliminating base solution consumption, as the same solution is perpetually reused and regenerated
Solution Approach 2:
The system utilizes phase transitions of CO2 between dissolved state (in base solution) and gaseous state (released CO2) to enable continuous processing. During absorption, CO2 transitions from gas to dissolved phase; during desorption, it transitions back to gas phase. These reversible phase transitions driven by phase transfer catalysts and temperature/pressure changes allow the base solution to continuously cycle between CO2-loaded and CO2-free states, maintaining continuous productivity without solution consumption
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 system achieves high scalability and reduced processing volume by regenerating the base solution, enabling efficient capture and reuse of carbon dioxide for various applications, with conversion rates of 75-99% and selectivity of 98-99%.
Implementation Method 1
air contacts the base solution thereby generating a base solution having carbon dioxide
Implementation Method 2
The air reacts with the base solution thereby generating a base solution having carbon dioxide
Implementation Method 3
heat is applied to the base solution having carbon dioxide thereby generating carbon dioxide and generating a base solution without carbon dioxide
Implementation Method 4
heat is applied to the base solution having carbon dioxide thereby generating carbon dioxide
Implementation Method 5
a phase transfer catalyst or agent with the structure of the form c[M+]d[Y−] that reduces interfacial surface tension and promotes mixing in gas-liquid or gas-liquid-solid systems
Implementation Method 6
a phase transfer catalyst or agent with the structure of the form c[M+]d[Y−] that reduces interfacial surface tension
Data Source
AI summary
A carbon processing system comprises an air mover and a multi-stage reactor. The multi-stage reactor processes ambient air and generates carbon dioxide and generates exhausted gas released to ambient air. In operation, air contacts the base solution via the air mover. The air reacts with the base solution thereby generating a base solution having carbon dioxide and generating exhaust (absorption reaction). Next, the exhaust is released from the reactor. Next, heat is applied to the base solution having carbon dioxide thereby generating carbon dioxide and generating a base solution without carbon dioxide (desorption reaction). The base solution without carbon dioxide generated after applying heat is reusable in processing new air. The absorption reaction and desorption reaction are reversible reactions resulting in regeneration of the base solution into its form prior to contact with the air yielding high scalability and less processing volume as required by many conventional carbon processing techniques.