CO2 Absorbent with Chain and Cyclic Amines for Amine Dispersion Control
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Solution Overview
Problem
Current carbon dioxide absorbents face challenges in efficiently capturing and releasing CO2 while minimizing amine dispersion, which affects environmental safety and operational efficiency, particularly in coal-fired power plants.
Innovation Solution
A carbon dioxide absorbent comprising a combination of chain and cyclic amines with a specific acid, such as sulfuric acid, is used, maintaining a pH range of 9.5 to 10.8 to enhance CO2 absorption and release performance, and suppressing amine dispersion through controlled molar ratios and acid selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a chemical absorbent (amine) is used to absorb carbon dioxide, then carbon dioxide absorption efficiency is improved, but amine dispersion in the air increases causing environmental harm
Solution Approach 1:
The patent introduces an amine trap system using water, acid, or other trapping agents as an intermediary substance. The amine trap is positioned between the chemical absorbent and the environment to capture dispersed amine before it reaches the air, thus resolving the contradiction between maintaining high CO2 absorption efficiency and preventing amine dispersion harm
Solution Approach 2:
The patent converts the harmful effect of amine dispersion into a beneficial trapping process. By designing the amine trap system, the dispersed amine that would otherwise be harmful is captured and retained, transforming the potential harm into a controlled process that maintains environmental safety while preserving absorbent performance
2Productivity
If heating is applied to release carbon dioxide from the absorbent, then carbon dioxide release efficiency is improved, but energy consumption increases
Solution Approach 1:
The patent implements a periodic action cycle where the chemical absorbent alternates between absorption mode (at lower temperatures) and release mode (heated). This periodic heating and cooling cycle enables continuous CO2 capture and release operations, improving overall productivity while managing energy consumption through strategic timing of the heating phase
Solution Approach 2:
The patent utilizes phase transitions of carbon dioxide (from dissolved state in the absorbent to gaseous state during heating) to achieve efficient CO2 release. By controlling temperature to induce this phase change, the system achieves high release efficiency while the condensed absorbent can be reused, reducing overall energy requirements compared to complete chemical decomposition
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 solution effectively absorbs and releases CO2 with high efficiency, reducing energy consumption and amine loss, thereby improving operational costs and environmental safety by maintaining a stable pH and minimizing amine dispersion.
Implementation Method 1
carbon dioxide absorption and release performance
Implementation Method 2
carbon dioxide release performance
Data Source
Figure 1(1)~1(5)
Figure 2
AI summary
A carbon dioxide absorbent of an embodiment includes a chain amine, a cyclic amine, and an acid. The chain amine is a compound expressed by Formula (1) of FIG.1. R1 in Formula (1) is hydrogen or an alkyl chain having at least one hydroxyl group and 1 to 7 carbon atoms. R2 in Formula (1) is an alkyl chain having at least one hydroxyl group and 1 to 7 carbon atoms. R3 in Formula (1) is hydrogen, a straight alkyl chain having 1 to 7 carbon atoms, a branched alkyl chain having 1 to 7 carbon atoms, or a cyclic alkyl chain having 5 to 7 carbon atoms.