Electrochemical CO2 Sequestration Apparatus with Reagent Recycling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing carbon dioxide sequestration technologies using calcium hydroxide are not optimized for better performance and require a steady, expensive inflow of metal hydroxide, limiting their efficiency and cost-effectiveness.
Innovation Solution
A multi-chamber apparatus that utilizes an alkaline solution in the first chamber to sequester carbon dioxide, with a second chamber performing a reaction to convert metal carbonate and metal hydroxide, and a third chamber performing electrochemical reactions to regenerate metal hydroxides, creating a sustainable system that recycles reagents and eliminates the need for constant refills.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If calcium hydroxide is used to capture carbon dioxide, then carbon dioxide sequestration is achieved, but the system requires a steady and expensive inflow of metal hydroxide
Solution Approach 1:
The system captures metal hydroxide that would otherwise be wasted in the carbon capture process and recovers it through electrochemical regeneration. The spent alkaline solution containing metal carbonates is converted back to metal hydroxide in the electrolysis cell, allowing continuous reuse without requiring constant fresh metal hydroxide input
Solution Approach 2:
The system generates its own regenerating agent (metal hydroxide) through electrochemical conversion of metal carbonates. This self-service mechanism eliminates the need for external expensive metal hydroxide supplies by internally converting the byproduct (metal carbonate) back into the active capture agent (metal hydroxide)
2Reliability
If conventional carbon dioxide capture methods are used, then carbon dioxide is captured, but regeneration processes are costly
Solution Approach 1:
The system replaces costly thermal or chemical regeneration processes with electrochemical regeneration. By using electricity to drive the conversion of metal carbonates back to metal hydroxide, the system achieves regeneration at lower cost and energy consumption compared to conventional high-temperature calcination or chemical treatment methods
Solution Approach 2:
The system changes the regeneration approach from thermal/chemical parameters to electrochemical parameters. By applying electrical potential to convert metal carbonates to metal hydroxide, the system operates under different parameter conditions that are more cost-effective and energy-efficient than traditional regeneration methods
3Productivity
If metal hydroxide is continuously supplied to maintain capture efficiency, then carbon dioxide sequestration performance is maintained, but operational costs increase
Solution Approach 1:
The system maintains continuous carbon dioxide capture capability while eliminating the need for continuous expensive metal hydroxide supply. The electrochemical regeneration unit continuously converts metal carbonates back to metal hydroxide, ensuring the capture process can operate continuously with recycled materials rather than requiring continuous fresh input
Solution Approach 2:
Instead of discarding metal hydroxide after single-use capture, the system recovers and regenerates it. The spent alkaline solution is fed to the electrolysis cell where metal carbonates are converted back to metal hydroxide, which is then recycled back to the capture process, creating a closed-loop system that eliminates continuous material input requirements
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 apparatus achieves efficient carbon dioxide sequestration with reduced costs by using low-cost common minerals and recycling reagents, overcoming the limitations of conventional systems that require constant metal hydroxide inflows and costly regeneration processes.
Implementation Method 1
The first chamber includes an alkaline solution, a gas inlet to receive carbon dioxide-containing gas, and a gas outlet, where a carbon dioxide concentration at the gas out is lower than a carbon dioxide concentration at the gas inlet
Implementation Method 2
The third chamber is configured to perform an electrochemical reaction to convert a mineral containing a second metal to a second metal hydroxide containing the second metal
Implementation Method 3
The second chamber is configured to perform a reaction to convert the first metal carbonate containing the first metal and the second metal hydroxide containing the second metal to the first metal hydroxide containing the first metal and a second metal carbonate containing the second metal
Data Source
AI summary
An apparatus includes a first chamber, a second chamber, and a third chamber. The first chamber includes an alkaline solution, a gas inlet to receive carbon dioxide-containing gas, and a gas outlet. The first chamber outputs a solution containing a first metal carbonate containing a first metal to the second chamber via a first channel, and the second chamber outputs a solution containing a first metal hydroxide containing the first metal to the first chamber via a second channel. The third chamber is configured to perform an electrochemical reaction to convert a mineral containing a second metal to a second metal hydroxide containing the second metal. The third chamber is coupled to the second chamber via a third channel and outputs the second metal hydroxide containing the second metal to the second chamber via the third channel.