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Influence of the Temperature on the Liquid–Liquid Equilibria of Heptane + Toluene + Sulfolane and Heptane + m-Xylene + Sulfolane

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Department of Environmental Engineering, Kun Shan University, Tainan 710, Taiwan, Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, Taipei 10608, Taiwan, and Department of Chemical and Materials Engineering, National University of Kaohsiung, Kaohsiung 811, Taiwan
* Corresponding author. E-mail: [email protected]
†Kun Shan University.
‡National Taipei University of Technology.
§National University of Kaohsiung.
Cite this: J. Chem. Eng. Data 2008, 53, 3, 760–764
Publication Date (Web):January 23, 2008
https://doi.org/10.1021/je700611f
Copyright © 2008 American Chemical Society
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    Abstract

    Equilibrium tie line data have been determined at (298.15, 323.15, 348.15, and 373.15) K for the ternary liquid–liquid equilibria (LLE) of heptane + (toluene or m-xylene) + sulfolane systems. The relative mutual solubility of toluene is higher than that of m-xylene in heptane + sulfolane mixtures. The tie line data were correlated with the UNIQUAC and NRTL models. The calculated values based on the UNIQUAC model were found to be better than those based on the NRTL model; the average root-mean-square deviation between the phase composition obtained from experiment and that from calculation was 0.5111 for UNIQUAC compared to 0.6475 for NRTL. The values of selectivity and the distribution coefficient were derived from the equilibrium data at different temperatures.

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