Experimental isobaric vapor liquid equilibrium for the ternary system of sec-butyl alcohol+sec-butyl acetate+dimethyl sulfoxide at 101.3kPa

Abstract

a b s t r a c tIsobaric vapor-liquid equilibrium (VLE) data were measured for the binary systems sec-butyl alcohol + dimethyl sulfoxide (DMSO), sec-butyl acetate + DMSO and the ternary system sec-butyl alcohol + sec-butyl acetate + DMSO at 101.3 kPa using a vapor-liquid equilibrium still. The thermodynamic consistency test for the binary experimental data was made by Herington method, Wisniak's L-W method and a point to point method of Van Ness test described by Fredenslund et al. And the thermodynamic consistency of the ternary system was checked by Van Ness test. The VLE data for the binary systems were correlated with the NRTL, Wilson and UNIQUAC activity coefficient models. And the binary and ternary VLE data predicted by the obtained binary interaction parameters agree well with the experimental data. The experimental results show that the relative volatility between sec-butyl alcohol and sec-butyl acetate is changed obviously when the mass ratio of DMSO to the pseudo-azeotrope mixture is 6:5. And DMSO is a promising extractive agent for the separation of the mixture of sec-butyl alcohol and sec-butyl acetate in extractive distillation.

Experimental isobaric (vapor + liquid) equilibrium data for the binary system N , N -dimethyl formamide + dimethyl sulfoxide and the quaternary system sec -butyl alcohol + sec -butyl acetate + N , N -dimethyl formamide + dimethyl sulfoxide at 101.3 kPa

“…The correlated binary interaction parameters are shown in Table 8, together with the root-mean-square deviations (RMSD) in temperature, pressure, liquid and vapor phase mole fraction. While the rest of binary interaction parameters were taken from literatures [5,6], which are also shown in Table 8. The comparisons between experimental and calculated data are shown in Fig.…”

“…In our previous work, DMF (3) and DMSO (4) were certified to be effective extractive solvents for separation of sec-butyl alcohol (1) and sec-butyl acetate (2) and DMSO performed better than DMF [5,6]. But the boiling point of DMSO is so high that it is likely to decompose when recovering extractive agent by distillation at 1 atm and even can cause explosion.…”

“…So, it is necessary to measure isobaric VLE data for the quaternary system sec-Butyl alcohol (1) þ sec-Butyl acetate (2) þ DMF (3) þ DMSO (4) and the constituent binary systems. The binary interactive parameters of the five systems: sec-butyl alcohol (1) þ sec-butyl acetate (2) [8], sec-butyl alcohol (1) þ DMF (3) [5], sec-butyl alcohol (1) þ DMSO (4) [6], sec-butyl acetate (2) þ DMF (3) [5], sec-butyl acetate (2) þ DMSO (4) [6] have been obtained in our previous work. Guo L. et al measured vapor pressure of the binary system of DMF (3) þ DMSO (4) at various temperature and concentrations by using a quasi-static ebulliometer method [7].…”

Isobaric Vapor–Liquid Equilibrium for the Binary and Ternary System with Isobutyl Alcohol, Isobutyl Acetate and Dimethyl Sulfoxide at 101.3 kPa

“…There are many strategies to separate the azeotropes, such as pressure-swing distillation, , azeotropic distillation, extractive distillation. − Among them, extractive distillation is the most widely used technology. With the addition of a solvent (entrainer), the relative volatility can be altered, which makes the azeotrope broken.…”

“…Dimethyl sulfoxide (DMSO) is a high polar solvent and can dissolve a lot many organic and inorganic chemicals. DMSO can be used to separate many azeotropes. − It was reported that DMSO was an effective solvent to separate isobutyl alcohol and isobutyl acetate. , Isobaric VLE data of the system of isobutyl alcohol, isobutyl acetate, and DMSO are essential for the simulation and design of an extractive distillation column. So far, the isobaric VLE data of isobutyl alcohol and isobutyl acetate have been reported .…”