Enrichment in CO(2) Absorption by 2-Methyl Piperazine-Activated Tertiary Amines, Physical Solvents, and Ionic Liquid Systems

[Image: see text] One of the ever-demanding research fields is the development of new solvents with better properties for mitigation of CO(2) compared to existing solvents. This work reports the measurement and modeling of CO(2) solubility in newly proposed aqueous solvent blends of 2-methyl piperazine with N-methyldiethanolamine (MDEA), sulfolane (TMSO(2)), and 1-butyl-3-methyl-imidazolium acetate ([bmim] [Ac]). The operating temperature and CO(2) partial pressure conditions chosen were 303.2–323.2 K and 2–370 kPa, respectively. Along with this, qualitative (13)C NMR and FTIR analysis were also performed to consider the proposed reaction scheme. The experimental vapor–liquid equilibrium data were modeled by a modified Kent–Eisenberg equilibrium model. The equilibrium constants associated with 2-methyl piperazine (2-MPZ) and [bmim] [Ac] deprotonation and carbamate formation reactions were regressed to fit the experimental CO(2) solubility data. In addition, the CO(2) cyclic capacity and heat of absorption were evaluated for the aq (MDEA + 2-MPZ) blend.