Vapor–Liquid Phase Equilibrium Data of CO₂ in Some Physical Solvents from 285.19 K to 313.26 K

Abstract

The solubility of CO2 in polyethylene glycol dimethyl ether (NHD), octamethyl cyclotetrasiloxane (D4), and diethyl succinate (DS) was determined at the temperature variations from 285.19 K to 313.26 K up to 6 MPa by the constant-volume method. Then, Henry’s law constant (H) based on mole fraction was obtained by linear fitting of the vapor–liquid phase equilibrium data, and some thermodynamic properties of solutions were also calculated from the correlation of H. The values of H in NHD, D4, and DS vary from 2.5 MPa to 8 MPa and increase in the following order: DS < D4 < NHD, which is identical to the order of the solvents ability to dissolve CO2. Additionally, Henry’s law constant increases with temperature increase to confirm the solubility of CO2 decrease in the corresponding solvents for the pressure range studied.