Absorption of carbon dioxide in mixtures of N-methyl-2-pyrrolidone and 2-amino-2-methyl-1-propanol

Research output: Contribution to journalArticle


It has been suggested that non-aqueous solvents containing amines may provide alternatives to aqueous alkanolamine solvents due to the potentially lower energy requirement for the regeneration of the amine. This paper presents experimental data on the solubility of CO2 and heat of absorption in the organic solvent N-methyl-2-pyrrolidone (NMP) and mixtures of 2-amino-2-methyl-1-propanol (AMP) in NMP. The solubility of CO2 was found to be very low at temperatures above 70 °C, the temperature at which the AMP/NMP solvent can be regenerated. The solubility of CO2 was higher at lower temperatures, particularly when precipitation of the AMP carbamate occurred. The heat of absorption in the AMP/NMP solvent decreased with increasing temperature, from approximately 90 kJ/mol CO2 at 40 °C and low loadings, to approximately 40 kJ/mol CO2 and 65 kJ/mol CO2, at 88 °C and low loadings, for the 15 wt% and 25 wt% AMP in NMP solvents, respectively. The results obtained complement our previous studies, together providing comprehensive data on the vapor–liquid equilibrium and the heat of absorption of CO2, which can be used to model the system.


Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Energy Engineering


  • AMP, CO, Heat of absorption, Henry's constant, NMP, Solubility
Original languageEnglish
Article number102952
JournalInternational Journal of Greenhouse Gas Control
Publication statusPublished - 2020 Apr
Publication categoryResearch