Vapor–Liquid Equilibrium for Methanol + Methyl Palmitate near the Critical Temperature of Methanol

Abstract

The vapor–liquid equilibrium for a methanol + methyl palmitate system was measured using a flow-type method at a pressure range of 1.86–8.81 MPa and a temperature range of 493–543 K, which is near the critical temperature of methanol (512.64 K). The mole fractions of methyl palmitate in the vapor phase were nearly zero, and the errors were also close to zero at all temperatures. The measuring errors of the liquid phase were slightly higher than those of the vapor phase. The Soave–Redlich–Kwong equation of state (SRK EOS), the Peng–Robinson equation of state (PR EOS), and the Cubic-Plus-Association equation of state (CPA EOS) combined with the Adachi–Sugie (AS) mixing rule were employed to correlate the measured data. The correlated results are consistent with the measured data. Because of their accuracy and concise calculation, the SRK and PR EOSs are better choices for correlating the methanol + methyl palmitate system when considering the accuracy and conciseness of calculating.