Isobaric Vapor–Liquid Equilibrium Measurements of Binary Systems of Dimethyl Carbonate with Dimethyl Sulfoxide, Anisole, and Diethyl Oxalate at 101.3 kPa

Abstract

In this work, three entrainers were selected to separate the azeotrope of dimethyl carbonate (DMC) and methanol, which were dimethyl sulfoxide, anisole, and diethyl oxalate. The vapor–liquid equilibrium (VLE) data of four binary systems (DMC + dimethyl sulfoxide, DMC + anisole, DMC + diethyl oxalate, and methanol + diethyl oxalate) were measured using a modified Rose-type circulating still at 101.3 kPa. The Van Ness point-to-point test and infinite dilution test were used to test the thermodynamic consistency of the experimental VLE data. The nonrandom two-liquid, universal quasi-chemical, and Wilson models were used to correlate the measured VLE data. The binary interaction parameters of the three models were regressed.

Strategy for the Separation of the Mixture of Dimethyl Carbonate, Formaldehyde, and Water

“…To check the consistency of the measured VLE data, the Van Ness test and infinite dilution test are adopted with reference to our previous work. 20 The details of the methods are presented in the Supporting Information.…”

“…According to our previous work, 20 the experimental VLE data was correlated with the NRTL and UNIQUAC models. The structural parameters r and q of ethylene glycol for the UNIQUAC model can be taken from the Aspen Property Databank, which are 2.4087 and 2.248, respectively.…”

“…The measurement apparatus and method have been described in previous work. 20 Briefly, the equilibrium temperature was measured using a precision mercury thermometer, and its uncertainty was 1 K. The system pressure was indicated with a manometer of uncertainty 0.08 kPa. To ensure that the system has reached equilibrium, the system temperature should be kept constant for at least 60 min.…”

“…Additionally, a modified Rose recirculating still was used to measure the VLE data of the DMC–ethylene glycol system at 101.3 kPa. The measurement apparatus and method have been described in previous work . Briefly, the equilibrium temperature was measured using a precision mercury thermometer, and its uncertainty was 1 K. The system pressure was indicated with a manometer of uncertainty 0.08 kPa.…”

Measurements, Correlations, and Modified UNIFAC Predictions of Isobaric Vapor–Liquid Equilibrium Data for the Binary System of Dimethyl Carbonate + Anisole at Different Pressures

“…VLE data for some binary mixtures consisting of either DMC or anisole with other components have been reported. 9−17 Recently, Song et al 18 have reported isobaric VLE data for the binary mixtures of DMC + dimethyl sulfoxide, DMC + anisole, DMC + diethyl oxalate, and methanol + diethyl oxalate at 101.3 kPa. However, for the binary system of DMC−anisole, isobaric, VLE data have not been reported Therefore, in the present study, we have considered DMC + anisole to study its phase equilibrium behavior at different pressures of 33.33, 46.66, 59.99, 73.33, and 94.66 kPa.…”