Selection of Blended Solvents for CO2 Absorption from Coal-Fired Flue Gas. Part 1: Monoethanolamine (MEA)-Based Solvents

• Published in: Energy & fuels 2012-01, Vol.26 (1), p.147-153
• Main Authors: Zhu, Dechen, Fang, Mengxiang, Lv, Zhong, Wang, Zhen, Luo, Zhongyang
• Format: Article
• Language: eng ; jpn
• ISSN: 0887-0624; 1520-5029
• DOI: 10.1021/ef2011113

Solvent selection is the potential breakthrough for the chemical absorption method to capture CO2 from coal-fired flue gas. A total of 16 kinds of selected monoethanolamine (MEA)-based solvents were assessed by absorption at 40 °C up to 12 kPa CO2 partial pressure and desorption at 100 °C down to 1.0 kPa CO2 partial pressure. Results showed that the 20% MEA + 10% diethylenetriamine (DETA) system maintains the highest average absorption rates and reaches the highest loading of 0.556 kg of CO2/kg of solute during all of the tested systems. The absorption capacity of the 20% MEA + 10% DETA system is increased to 53%, and the corresponding average removal efficiency is enhanced more than 31% compared to 30% MEA solution. Furthermore, there is only a slight difference between the regeneration performance of the 20% MEA + 10% DETA system and that of the 30% MEA solution.