Organic Salt Effect of Tetramethylammonium Bicarbonate on the Vapor-Liquid Equilibrium of the Dimethyl Carbonate plus Methanol System

Isobaric vapor-liquid equilibrium (VLE) data for the systems dimethyl carbonate (DMC) + methanol and DMC + methanol + tetramethylammonium bicarbonate (TMAB) at different salt mole fractions (0.04, 0.07, and 0.10) have been measured at 101.32 kPa. The bubble-point data of the system methanol + TMAB have also been measured at different salt mole fractions. The addition of the organic salt TMAB has a salting-out effect on DMC, and the effect would be enhanced with the increasing salt concentration. The VLE data of the salt-containing system were predicted by the modified Wilson and nonrandom two-liquid (NRTL) models proposed by Tan. The average deviations for the mole fraction of the vapor phase and the bubble point by the modified predictive model were: Delta y = 0.011, Delta T = 0.6 K.