Bipolar Membrane Electrodialysis for Regenerating CO2 Capture Solution
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Solution Overview
Problem
Existing technologies are ineffective in capturing carbon dioxide from the atmosphere due to low concentrations and large volumes of air, and existing regeneration processes are energy-intensive and inflexible.
Innovation Solution
An electrochemical system using a bipolar membrane electrodialysis unit (BPMED) and a carbonate separation subsystem to regenerate a capture solution, allowing decoupling of CO2 capture and regeneration subsystems, enabling adaptable and scalable CO2 capture from dilute sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a liquid sorbent is used to capture CO2 from the atmosphere, then CO2 can be captured from dilute sources, but the system requires large volumes of air and has low capture efficiency
Solution Approach 1:
The system separates the CO2 capture process into two distinct stages: absorption in a liquid sorbent followed by carbonate separation and regeneration. This segmentation allows the capture subsystem to operate independently from the regeneration subsystem, improving overall efficiency and adaptability to different feed conditions.
Solution Approach 2:
The system dynamically adjusts operational parameters including feed flow rates, pH levels, and electrolyte concentrations to optimize CO2 capture efficiency under varying atmospheric conditions. The bipolar membrane electrodialysis process enables real-time parameter modulation to maintain high capture rates despite dilute CO2 concentrations.
2Productivity
If a thermochemical regeneration process is used, then CO2 can be released and capture solution regenerated, but the process is energy-intensive
Solution Approach 1:
The patent replaces traditional thermochemical regeneration processes with an electrochemical bipolar membrane electrodialysis system. This substitution eliminates the need for high-temperature calcination and complex chemical reactions, reducing energy consumption while maintaining high CO2 release rates through electrical energy input.
Solution Approach 2:
The bipolar membrane electrodialysis process utilizes phase transitions and ion migration to regenerate the capture solution. By applying an electric potential, the system drives ion transport through bipolar membranes, enabling efficient carbonate conversion and CO2 release without requiring thermal energy input.
3Productivity
If a complex regeneration process is integrated with the capture system, then CO2 capture can be achieved at commercial scale, but the system complexity increases
Solution Approach 1:
The system is divided into modular subsystems: CO2 capture subsystem, carbonate separation subsystem, and regeneration subsystem. Each module can be independently sized, operated, and maintained, enabling commercial-scale deployment while reducing overall system complexity through standardized interfaces and control protocols.
Solution Approach 2:
The bipolar membrane electrodialysis unit serves multiple functions simultaneously: it separates carbonate from the capture solution, regenerates the liquid sorbent, and produces concentrated CO2 stream. This multi-functionality reduces the need for additional separate equipment, simplifying the overall system architecture while maintaining commercial-scale productivity.
4Productivity
If existing regeneration processes are used, then CO2 can be captured, but the processes are inflexible and difficult to adapt to varying conditions
Solution Approach 1:
The system incorporates dynamic control mechanisms that continuously adjust feed flow rates, pH levels, and electrical parameters in response to varying atmospheric CO2 concentrations and environmental conditions. This dynamic operation enables the system to maintain optimal CO2 capture rates across a wide range of operating conditions.
Solution Approach 2:
The system employs sensors and control systems that monitor key parameters including CO2 concentration, pH, and flow rates, providing real-time feedback to adjust operational settings. This feedback mechanism ensures flexible adaptation to changing environmental conditions while maintaining high capture productivity.
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 efficient CO2 capture and regeneration with adaptability to varying environmental conditions and electricity sources, reducing energy consumption and equipment fouling, and producing scalable carbon products.
Implementation Method 1
flowing a water stream and the ED feed solution to a bipolar membrane electrodialysis (BPMED) unit; applying an electric potential to the BPMED unit to form at least two ED product streams including a first ED product stream that includes a hydroxide
Implementation Method 2
separating at least a portion of carbonate from the carbonate-rich capture solution includes crystallizing the portion of carbonate to form a crystalline carbonate hydrate
Implementation Method 3
capturing carbon dioxide from a dilute gas source with a CO2 capture solution to form a carbonate-rich capture solution
Implementation Method 4
the capture solution can be an aqueous alkaline solution that forms a carbonate-rich solution when reacted with CO2 in the air
Implementation Method 5
bipolar membrane electrodialysis (BPMED) unit; applying an electric potential to the BPMED unit to form at least two ED product streams
Data Source
AI summary
Techniques according to the present disclosure include capturing carbon dioxide from a dilute gas source with a CO2 capture solution to form a carbonate-rich capture solution; separating at least a portion of carbonate from the carbonate-rich capture solution; forming an electrodialysis (ED) feed solution; flowing a water stream and the ED feed solution to a bipolar membrane electrodialysis (BPMED) unit; applying an electric potential to the BPMED unit to form at least two ED product streams including a first ED product stream including a hydroxide; and flowing the first ED product stream to use in the capturing the carbon dioxide from the dilute gas source with the CO2 capture solution.