5521027 Non-aqueous secondary electrochemical battery

Experimental Isobaric Vapor−Liquid Equilibrium for Binary Systems of Ethyl Methyl Carbonate + Methanol, + Ethanol, + Dimethyl Carbonate, or + Diethyl Carbonate at 101.3 kPa

“…The VLE data at atmospheric pressure were measured using a circulation vapor-liquid equilibrium still (a modified Othmer still). The total volume of the still was about 60 cm 3 of which the liquid occupied about 50 cm 3 . The details about this apparatus were described by Li et al 8 During the experiments, the liquid was injected into the boiling chamber and heated.…”

“…Equilibrium was assumed when constant vapor and liquid temperature was obtained in about (0.5 to 1) h. The system was maintained in the equilibrium state for about 30 min, and samples of the vapor and liquid phase were taken using a microsyringe from the sampling ports and then analyzed. This is done with minor disturbances on the equilibrium concentration and temperature since the size of the samples [(0.2 to 0.3) µL] is negligible compared to the volume of the still, 60 cm 3 .…”

“…Among the various synthesis processes for ethyl methyl carbonate, the transesterification of DMC with ethanol is environmentally benign and has a relatively high reaction equilibrium constant and thus is considered as a feasible process. 2,3 The reaction system contains the following five components: methanol, ethanol, DMC, EMC, and DEC, which implies a challenge in the separation. Although many contributions to the process parameters and the utilization of EMC have come forth, 4 those on the vapor-liquid equilibrium (VLE) data of EMC with other components are minimal.…”

“…In view of this, many researchers devote themselves to developing synthesis methods for ethyl methyl carbonate. Among the various synthesis processes for ethyl methyl carbonate, the transesterification of DMC with ethanol is environmentally benign and has a relatively high reaction equilibrium constant and thus is considered as a feasible process. , …”