Ternary Liquid−Liquid Equilibria for Systems of (Sulfolane + Toluene or Chloronaphthalene + Octane)

Abstract

Tie-line data for ternary systems of (sulfolane + toluene + octane) at temperatures of 303.2 K and 313.2 K and (sulfolane + chloronaphthalene + octane) at temperatures of 298.2 K and 303.2 K are reported. The composition of liquid phases at equilibrium was determined by gas-liquid chromatography, and the results were correlated with the UNIQUAC and NRTL activity coefficient models to obtain the binary interaction parameters. Both the UNIQUAC and the NRTL models satisfactorily correlated the equilibrium compositions. The partition coefficients and the selectivity factor of sulfolane for extraction of toluene and chloronaphthalene from octane-containing systems are calculated. Then the efficiency of the extraction of toluene from the (toluene + octane) mixture is compared with that for the extraction of chloronaphthalene from the (chloronaphthalene + octane) mixture by using the calculated selectivity factors and the partition coefficients of the used solvent. The phase diagrams for the ternary systems are presented, and the correlated tie-line results have been compared with the experimental data.

(Liquid+liquid) equilibria for ternary mixtures of (ethylene glycol+toluene+n-octane)

“…Considering the important role of a suitable solvent in the extraction process operations, the research for finding new solvents, in (liquid + liquid) extraction is an ongoing investigation [4][5][6][7][8]. In this line of research, the theoretical and experimental studies of (liquid + liquid) equilibrium (LLE) for different systems were presented in the literature [9][10][11]. The basic aim of these investigations was focused on the finding a non-toxic, inexpensive, and easily recoverable solvent for (liquid + liquid) extraction processes in the industrial units [12].…”

“…In previous works, we reported the LLE results for the mixtures (tetramethylene sulfone or dimethyl sulfoxide or ethylene carbonate + toluene or m-xylene + n-heptane or n-octane or cyclohexane) at different temperatures (298.5, 303.15, and 313.15) K [10][11][12]. On the basis of this work, it was suggested that ethylene carbonate as a solvent was more suitable than tetramethylene sulfone or dimethyl sulfoxide for extracting the aromatic hydrocarbon from alkane mixtures.…”

Separation of aromatic hydrocarbons (toluene or benzene) from aliphatic hydrocarbon (n-heptane) by extraction with ethylene carbonate

“…The equilibrium apparatus used in the present work was similar to that used in the previous study [3]. The equilibrium cell is made of glass with a water jacket to maintain a constant 0021-9614/$ -see front matter Ó 2010 Elsevier Ltd. All rights reserved.…”

“…The separation of aromatic hydrocarbons from alkanes by solvent extraction processes has been an area of active research in various chemical, petrochemical, and oil industries [1][2][3]. Because of the known limitations of the direct separation processes such as distillation for practical extraction of the constituent components of the non-ideal mixtures, the indirect separation processes such as solvent extraction may be considered.…”

Liquid–Liquid Equilibria for the Extraction of Chloropropanols from 1,2-Dichloropropane Using Water or 1,4-Butylene Glycol

“…Liquid–liquid extraction (LLE) of chloropropanols appears as another convenient choice for DCP upgrading. In order to understand and design a proper solvent extraction process, reliable liquid–liquid phase equilibria data are necessary. , …”