Binary mixture phase equilibria for the vinyl laurate, vinyl methacrylate and vinyl propionate under high pressure carbon dioxide

Abstract

The experimental phase equilibrium data of binary mixtures of vinyl laurate, vinyl methacrylate, and vinyl propionate in supercritical CO2 fluid is reported at high pressure starting from 3.92 MPa to 23.55 MPa and temperature varying from 313.2 K to 393.2 K with a static-type high pressure apparatus. It is observed that the solubility of binary mixtures considered in present study increases with temperature at constant pressure. Furthermore, at constant pressure, the critical point of the mixtures moves higher as temperature increases. Besides, the type I phase curve is exhibited by all the binary mixtures considered.The experimental bubble pressure data is correlated with Ghoderao-Dalvi-Narayan (GDN) and Peng-Robinson (PR) equations of state by the using Van der Waals single fluid mixing rules with two adaptable interaction factors. The pressure-composition (P-x) isotherms are obtained for the binary systems (carbon dioxide + vinyl laurate), (carbon dioxide + vinyl methacrylate), and (carbon dioxide + vinyl propionate) at several temperatures varying from 313.2 K to 393.2 K. A good fit to the experimental data is obtained with GDN equation of state performing better than PR equation of state.