Elsevier

Fluid Phase Equilibria

Volume 394, 25 May 2015, Pages 83-87
Fluid Phase Equilibria

Isobaric vapor–liquid equilibrium for ternary system of sec-butyl alcohol + sec-butyl acetate + N,N-dimethyl acetamide at 101.3 kPa

https://doi.org/10.1016/j.fluid.2015.03.013Get rights and content

Abstract

Isobaric vapor–liquid equilibrium (VLE) data were measured for the binary systems sec-butyl alcohol + N,N-dimethyl acetamide (DMAC), sec-butyl acetate + DMAC and the ternary system sec-butyl alcohol + sec-butyl acetate + DMAC at 101.3 kPa using a vapor–liquid equilibrium still. The thermodynamic consistency test for the binary experimental data was made by Herington method and McDermott–Ellis method. And the thermodynamic consistency test for the ternary experimental data was made by McDermott–Ellis method. The binary VLE data were correlated with the NRTL, Wilson and UNIQUAC activity coefficient models. The obtained binary interaction parameters were used to predict the binary and ternary VLE data. The results indicate that the calculated values of vapor phase mole fraction and boiling temperature by the NRTL, Wilson and UNIQUAC models agree well with the experimental data. And the binary pseudo-azeotrope of sec-butyl alcohol and sec-butyl acetate was eliminated when the mass ratio of DMAC to the pseudo-azeotrope mixture is 6:5. Thus, DMAC is an appropriate solvent for 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 raw materials. sec-Butyl alcohol is also the feedstock of pesticides, wetting agents, polymerization additives and so on [1]. And sec-butyl acetate is an environment harmony solvent, which can be used as spice, solvent of lacquer and volatile solvent in printing ink [2], [3]. sec-Butyl alcohol and sec-butyl acetate form a “pseudo-azeotrope” [4], [5], which cannot be separated by common distillation. To separate the binary mixture by extractive distillation, the isobaric VLE data for ternary system of sec-butyl alcohol + sec-butyl acetate + N,N-dimethyl formamide at 101.3 kPa were measured in our previous work [1]. It is reported that N,N-dimethyl acetamide (DMAC) is another promising solvent for separating the “pseudo-azeotrope” of sec-butyl alcohol and sec-butyl acetate [6], which presents fine solubility with alcohols and esters, good thermo stability, low toxicity and low corrosiveness [7], [8], [9]. Isobaric VLE data for the system of sec-butyl alcohol (1) + sec-butyl acetate (2) + DMAC (3) and its corresponding binary systems are vital for the simulation and design of an extractive distillation column. So far, no VLE data except those for sec-butyl alcohol (1) + sec-butyl acetate (2) system have been reported in the open literature as yet [4]. Thus, isobaric VLE data for sec-butyl alcohol (1) + DMAC (3), sec-butyl acetate (2) + DMAC (3) and sec-butyl alcohol (1) + sec-butyl acetate (2) + DMAC (3) were determined in this work to provide fundamental data for the separation of sec-butyl alcohol and sec-butyl acetate by extractive distillation using DMAC as the extractive agent.

Section snippets

Experimental reagents

Three analytical reagents (AR), sec-butyl alcohol, sec-butyl acetate and DMAC, were used in this work. The molecular formula, CASRN, source and mass fraction measured by a gas chromatograph (GC) equipped with a flame ionization detector (FID) of the reagents are listed in Table 1, respectively. The physical properties of the pure components, including molecular weight M, density ρ, boiling point Tb, critical temperature Tc, critical pressure pc and acentric factor ω, are shown in Table 2, which

Experimental data

The reliability of the operation procedures and the experimental apparatus was tested in our previous work by comparing the experimental VLE data of methanol and ethanol and literature ones [1]. The isobaric VLE data of the binary systems sec-butyl alcohol (1) + DMAC (3), sec-butyl acetate (2) + DMAC (3) and ternary system sec-butyl alcohol (1) + sec-butyl acetate (2) + DMAC (3) were measured at 101.3 kPa with the above modified Othmer still. The experimental data T, x1, y1 and calculated activity

Conclusion

The isobaric VLE data of binary systems sec-butyl alcohol (1) + DMAC (3), sec-butyl acetate (2) + DMAC (3) and ternary system sec-butyl alcohol (1) + sec-butyl acetate (2) + DMAC (3) at 101.3 kPa were measured with a modified Othmer still. The thermodynamic consistency test for the binary experimental data was made by Herington method and McDermott–Ellis method. And the thermodynamic consistency test for the ternary experimental data was made by McDermott–Ellis method. The binary VLE data were

References (16)

  • X.M. Zhang et al.

    Fluid Phase Equilib.

    (2014)
  • L. Zhang

    Market Modern.

    (2006)
  • J.F. Shen

    Anhui Chem. Ind.

    (2012)
  • Y.G. Hu

    Speciality Petrochem.

    (2000)
  • H.X. Wang et al.

    J. Chem. Eng. Data

    (2013)
  • W. Clough et al.

    Ind. Eng. Chem.

    (1923)
  • L. Berg, U.S. Patent 4,718,988, January 12,...
  • X.L. Wang et al.

    J. Petro. Univ.

    (2003)
There are more references available in the full text version of this article.

Cited by (13)

  • Densities and excess volumes of binary and ternary mixtures of N, N-dimethyl sulfoxide, N,N-dimethylacetamide, and N-methyl-2-pyrrolidone at T = (293.15, 313.15)K and atmospheric pressure

    2022, Chemical Data Collections
    Citation Excerpt :

    NMP is more commonly used for separation of hydrocarbon mixtures [12–14]. DMA is considered as potential extractive agent, since it selectively increases the relative volatility of the substances [15–17]. The use of mixed extractive agents containing one of discussed solvents can provide a number of advantages [18–25].

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

    2019, Journal of Chemical Thermodynamics
    Citation Excerpt :

    It is also used in pesticides, polymerization additives, gasoline additives and so on [3]. SBAC is an environmental friendly solvent used in metal cleaning agents, printing ink and spices [4,5]. And the features of high octane number, low oxygen content and low-toxicity make it replace methyl tert-butyl ether (MTBE) as the gasoline additive [6].

  • Vapor–liquid equilibrium in the ternary system isobutyl alcohol + isobutyl acetate + N, N-dimethyl acetamide and the binary systems isobutyl alcohol + N, N-dimethyl acetamide, isobutyl acetate + N, N-dimethyl acetamide at 101.3 kPa

    2017, Fluid Phase Equilibria
    Citation Excerpt :

    Because of these merits, it is widely used as solvent in the open literature [18–20]. It is reported that DMAC is a promising solvent for separating the azeotropeic mixtures of alcohol and acetate [18], which presents high selectivity and fine solubility with alcohols and esters, good thermal stability, low toxicity and low corrosiveness. Because of the properties above, DMAC was selected as the solvent to separate isobutyl alcohol and isobutyl acetate here.

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

    2015, Fluid Phase Equilibria
    Citation Excerpt :

    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].

View all citing articles on Scopus
View full text