Amine-Calcium CO2 Capture and Mineralization Process
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Solution Overview
Problem
Current carbon capture and storage technologies require high energy for carbon dioxide recovery and separate capture and storage steps, making the process complex and inefficient, especially when trying to rapidly remove large amounts of carbon dioxide.
Innovation Solution
A method involving an aqueous solution with an amine-based compound and an acidic calcium compound is used to precipitate calcium carbonate from carbon dioxide-containing gases, followed by the addition of a basic calcium compound, allowing for continuous and rapid mineralization without the need for additional energy or induction time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If amine-based compound is used to capture carbon dioxide at high concentration, then carbon dioxide capture efficiency is improved, but high energy is required for recovery
Solution Approach 1:
The patent combines the carbon dioxide capture step and the mineralization step into a single integrated process. The amine-based compound captures CO2, and the captured CO2 is immediately mineralized by reacting with calcium salt in the same aqueous solution, eliminating the need for separate high-energy recovery operations.
Solution Approach 2:
The patent changes the chemical parameters of the system by introducing calcium salts (such as calcium chloride) and controlling pH levels to enable spontaneous mineralization of captured CO2 into calcium carbonate precipitates, replacing energy-intensive thermal recovery methods.
2Reliability
If capture step and storage step are separated, then each step can be optimized, but the process becomes complicated
Solution Approach 1:
The patent merges the capture function and storage function into a single reactor system where CO2 is captured by amine and simultaneously mineralized into stable calcium carbonate solids that can be directly separated and stored, creating a unified capture-storage process.
3Ease of operation
If absorption and precipitation steps are separated, then each step can be controlled independently, but it becomes difficult to remove large amount of carbon dioxide within short time
Solution Approach 1:
The patent establishes a continuous process where CO2 absorption and calcium carbonate precipitation occur simultaneously in the same aqueous phase, allowing uninterrupted removal of large amounts of CO2 without intermediate separation steps that would slow down the overall rate.
4Reliability
If induction time for preparing carbon dioxide saturated aqueous solution is long, then complete saturation is achieved, but process efficiency is reduced
Solution Approach 1:
The patent performs preliminary preparation of the aqueous solution by dissolving calcium salts and adjusting pH conditions before CO2 introduction, so that when CO2 is absorbed, the mineralization reaction can proceed immediately without requiring a separate induction period for solution preparation.
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
This method enables efficient, continuous carbon dioxide removal with high process efficiency, reducing energy consumption and eliminating the need for separate capture and storage steps, facilitating rapid mineralization and separation.
Implementation Method 1
bringing a gas containing carbon dioxide to be treated into contact with the aqueous solution to prepare a calcium carbonate precipitate
Implementation Method 2
bringing a gas containing carbon dioxide to be treated into contact with the aqueous solution to prepare a calcium carbonate precipitate
Data Source
AI summary
The present invention relates to a method for continuous removal of carbon dioxide, the method comprising the steps of: a) preparing an aqueous solution containing an amine-based compound and an acidic calcium compound; b) bringing a gas containing carbon dioxide to be treated into contact with the aqueous solution to prepare a calcium carbonate precipitate; and c) recovering the calcium carbonate and then adding a basic calcium compound to the residual aqueous solution, wherein after step c), step b) and step c) are repeatedly performed. The removal of carbon dioxide by the method of the present invention has advantages of requiring low energy and being capable of mineralizing and removing carbon dioxide at a fast rate without a separate time for induction.