Determination and modelling of the high-pressure vapour–liquid equilibrium carbon dioxide–methyl acetate

Abstract

Experimental data for the high-pressure vapour–liquid equilibrium of the binary system of carbon dioxide and methyl acetate have been measured. Equilibrium data were needed for investigation of acetic acid esterification with methanol. Pressure–composition ( P– x) isotherms were determined at 308, 318 and 328 K and an operation pressure up to 9 MPa. Data were modelled using the Peng–Robinson equation of state. Van der Waals one-fluid mixing rules were used for the temperature-dependent function a and for parameter b in the Peng–Robinson equation. One parameter van der Waals model for the cross coefficient terms a ij and b ij was used, which both contain one adjustable binary interaction parameter k ij and l ij , respectively. In a second modelling method the temperature dependence of k ij and l ij was determined. A comparison of experimental results with calculations obtained from PR equation showed a reasonable accordance of the data over a wide range of composition.