Vapor-Liquid Equilibrium of Carbon Dioxide in a 5m Aqueous Solution of 2-(Dimethylamino) Ethanol

Kreangkrai Maneeintr, Thanaphat Luemunkong, and Tawatchai Charinpanitkul


Vapor-liquid equilibrium, solubility, carbon dioxide, flue gas, absorption


Recently, environmental problems on climate change and global warming are the main concern due to the higher amount of carbon dioxide (CO2) in the atmosphere. The main sources of CO2 are flue gas from fossil-fired power plants. Chemical absorption with amine solution is a proven process to capture CO2 effectively. The commercially used amine solution is monoethanolamine (MEA). However, it still has drawbacks. Consequently, novel chemicals for CO2 capture have been developed to improve the amine performance. Therefore, the objective of this study is to measure the vapor-liquid equilibrium of CO2 in a 5M aqueous solution of 2-(Dimethylamino) ethanol (DMAE) used as a new solvent. This work is measured the solubility at CO2 partial pressures from 5 to 100 kPa and temperature at 303.15, 313.15, 333.15 and 353.15 K with 5 M concentration. The solubility results of CO2 in aqueous solution of DMAE are compared with that of MEA at the same conditions. The results show that the DMAE has up to 713% higher capacity than that of MEA. This means DMAE can be recovered with less energy and lead to high energy saving for carbon capture process. Also, rate of CO2 loading change from this study is also measured.

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