Phase-Separated CO2 Absorption With Deoxygenation Regeneration
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Solution Overview
Problem
Existing gas treatment methods for recovering CO2, such as chemical absorption, require significant thermal energy and lead to deterioration of the treatment solution over time, increasing running costs and necessitating frequent replenishment of components like amine compounds.
Innovation Solution
A gas treatment method involving phase-separation of the treatment solution into a first and second phase portion, followed by deoxygenation treatment of the second phase portion before heating to release the acidic compound, thereby suppressing oxidative degradation and allowing continuous operation without replenishment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a chemical absorption method is used to recover CO2 from large volume gas, then CO2 separation and recovery is achieved, but a large amount of thermal energy is required for heating the absorption solution to release CO2, increasing running cost
Solution Approach 1:
The treatment solution is divided into two separate phases: a first phase portion containing the amine compound for CO2 absorption, and a second phase portion serving as an oxygen barrier. This segmentation allows the CO2 absorption function to be maintained while the second phase prevents oxidative degradation, reducing the need for frequent amine replenishment and associated energy costs.
Solution Approach 2:
The second phase portion acts as an intermediary or protective layer between the amine compound in the first phase and oxygen in the gas to be treated. This intermediary prevents direct contact between oxygen and the amine compound, suppressing oxidative degradation without interfering with the CO2 absorption process.
2Productivity
If the absorption solution is heated repeatedly to release CO2, then CO2 recovery is maintained, but the treatment solution deteriorates over time due to oxidative degradation, requiring frequent replenishment of amine compounds
Solution Approach 1:
The second phase portion is introduced beforehand as a protective cushion that prevents oxygen from reaching and degrading the amine compound in the first phase. This prior protection allows the treatment solution to maintain its effectiveness over extended periods of continuous operation without frequent replenishment.
Solution Approach 2:
The second phase portion acts as a sacrificial or consumable protective layer that can be easily replenished or regenerated. By using this disposable-like protective phase, the more valuable amine compound in the first phase is protected from degradation, reducing overall operating costs.
3Ease of operation
If the treatment solution is used continuously without deoxygenation treatment, then operational simplicity is maintained, but oxidative degradation of the amine compound occurs, increasing running cost
Solution Approach 1:
The second phase portion is prepared and positioned in advance within the absorption solution before the gas treatment process begins. This preliminary arrangement creates an automatic oxygen barrier that protects the amine compound throughout operation, eliminating the need for complex deoxygenation equipment or procedures while preventing substance loss.
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 method effectively suppresses treatment solution deterioration, enabling continuous separation and recovery of acidic compounds like CO2 over a long period with reduced energy consumption.
Implementation Method 1
a treatment solution that phase-separates by absorption of the acidic compound
Implementation Method 2
absorption of the acidic compound
Implementation Method 3
a step of applying deoxygenation treatment to the separated second solution
Implementation Method 4
a step of heating the first solution together with the second solution to which the deoxygenation treatment is applied so as to release the acidic compound
Data Source
AI summary
One aspect of the present invention is a gas treatment method including a step of causing a gas to be treated containing an acidic compound to be absorbed into a treatment solution phase-separated by absorption of the acidic compound, a step of separating the treatment solution, which is phase-separated into a first phase portion having relatively high content of the acidic compound and the second phase portion having relatively low content of the acidic compound as the acidic compound is absorbed, into a first solution mainly containing the first phase portion and a second solution mainly containing the second phase portion, a step of applying deoxygenation treatment to the separated second solution, and a step of heating the first solution together with the second solution to which the deoxygenation treatment is applied so as to release the acidic compound from the first solution and the second solution.