Elsevier

Fluid Phase Equilibria

Volume 406, 25 November 2015, Pages 55-60
Fluid Phase Equilibria

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

https://doi.org/10.1016/j.fluid.2015.07.029Get rights and content

Abstract

Isobaric 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 LW 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.

Introduction

sec-Butyl alcohol and sec-butyl acetate are important solvents and fine chemicals. The difference between vapor and liquid composition is nearly negligible. The mixture of sec-butyl alcohol and sec-butyl acetate is difficult to be separated by a conventional distillation process. Extractive distillation is a practical way of separating the difficult separated mixture, in which extractive agent is added to alter the vapor liquid equilibrium (VLE) of the binary system sec-butyl alcohol and sec-butyl acetate and make the separation feasible. N,N-dimethyl formamide and N,N-dimethyl acetamide were proved to be promising solvent in separation of sec-butyl alcohol and sec-butyl acetate mixture by extractive distillation in our previous work [1], [2]. Dimethyl sulfoxide (DMSO) is also indicated as a potential extractive agent for the separation of the discussed binary mixture [1], [3]. So far, only the isobaric VLE data of sec-butyl alcohol (1) + sec-butyl acetate (2) can be found in the open literature [4]. The VLE data for sec-butyl alcohol (1) + DMSO (3), sec-butyl acetate (2) + DMSO (3) and sec-butyl alcohol (1) + sec-butyl acetate (2) + DMSO (3) have not been reported in the literature. VLE data of the sec-butyl alcohol (1) + sec-butyl acetate (2) + DMSO (3) system are vital for the simulation and design of an extractive distillation process. To provide fundamental data for the separation of sec-butyl alcohol and sec-butyl acetate by extractive distillation using DMSO as extractive agent, isobaric VLE data for these systems were explored in this work.

Section snippets

Experimental chemicals

The analytical reagents from Tianjin Jiangtian Co., Ltd., China, sec-butyl alcohol, sec-butyl acetate and DMSO, were used in this work. Their molecular formula, CASRN and mass fraction are listed in Table 1. The purities of the chemicals were determined by a gas chromatograph (GC) equipped with a flame ionization detector (FID). The physical properties of the pure components are shown in Table 2. The saturated vapor pressure pis of the chemicals were calculated by the following extended Antoine

Experimental data

The reliability of the operation procedures and the experimental apparatus were confirmed in our previous work [8]. The isobaric VLE data of the binary systems sec-butyl alcohol (1) + DMSO (3), sec-butyl acetate (2) + DMSO (3) and ternary system sec-butyl alcohol (1) + sec-butyl acetate (2) + DMSO (3) were measured at 101.3 kPa with the modified Othmer still. The experimental data T, x1, y1 and calculated activity coefficients γ1, γ2 are listed in Table 4, Table 5, Table 6. The determination method of

Conclusion

The isobaric VLE data for the binary systems sec-butyl alcohol (1) + DMSO (3), sec-butyl acetate (2) + DMSO (3) and ternary system sec-butyl alcohol(1) + sec-butyl acetate (2) + DMSO (3) were measured at 101.3 kPa using a modified Othmer still. All of the binary VLE data passed the Herington test, Wisniak's LW method and a point to point method of Van Ness test described by Fredenslund et al. And the ternary VLE data passed the Van Ness test. The isobaric VLE data of the binary systems were correlated

References (17)

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