Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

ABSTRACT

This work is focused on the possible capture of carbon dioxide using ionic liquids (ILs). Such solventsare gaining special attention since the efficiency of many processes can be enhanced by the judiciousmanipulation of their properties. In this work, the potential use of two ILs: 1-butyl-3-methylimidazolium diethylene-glycolmonomethylethersulfate [BMIM][MDEGSO4] and trihexyl(tetradecyl)phosphonium dodecyl-benzenesulfonate [THTDP][C12H25PhSO3] is evaluated through the measurementof the liquid vapor equilibrium in mixture with CO2at temperatures up to 373 K and pressures up to300 bar. Experimental data indicate that 95 g of CO2can be absorbed per kg of ionic liquid. For each IL,the parameters of the PC-SAFT EoS were estimated using experimental density data measured underatmospheric pressure in a wide range of temperatures. After fitting a binary interaction parameter kijon experimental liquid-vapor equilibria data, the model was able to describe accurately carbon dioxidesolubility in these two ionic liquids.