Solid-Liquid Phase Equilibria and Excess Gibbs Free Energies for p-Xylene+Cyclohexane,p-Xylene+Dimethyl Sulfoxide

Chem. J. Chinese Universities ›› 1994, Vol. 15 ›› Issue (9): 1353.

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Solid-Liquid Phase Equilibria and Excess Gibbs Free Energies for p-Xylene+Cyclohexane,p-Xylene+Dimethyl Sulfoxide

CHE Guan-Quan, HUANG Zhong-Qi, LUO San-Lai, YUN Feng-Cun, ZOU Yong-Kuang

Department of Chemistry, Zhongshan University, Guangzhou, 510275

Received:1993-09-09 Revised:1994-05-21 Online:1994-09-24 Published:1994-09-24

Abstract

Abstract: Melting temperatures have been measured and the solid-liquid phase diagrams were constructed for p-xylene+cyclohexane, and p-xylene+ dimethyl sulfoxide.They are simple eutectic systems.Eutectic temperatures and compositions are 240. 96 K, 0.825 and 280.99K, 0.53Ofor(1-x)p-C₆H₄(CH₃)₂+xC₆H₁₂ and(1-x)p-C₆H₄ (CH₃) ₂+x(CH₃)₂SO, respectively. Excess molar Gibbs free energies were calculated at 313.15 K.The largest values of are 233.7 and 1224. 8/mol for(1-x)p-C₆H₄ (CH₃) ₂+xC₆H₁₂ and (1-x)pC₆H₄(CH₃)₂+x (CH₃)₂SO, respectively, showing positive deviations from ideal-solution behvior.The latter deviation is very large, especially.

Key words: Phase diagram, Solid-liquid equilibria, Excess Gibbs free energy

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CHE Guan-Quan, HUANG Zhong-Qi, LUO San-Lai, YUN Feng-Cun, ZOU Yong-Kuang. Solid-Liquid Phase Equilibria and Excess Gibbs Free Energies for p-Xylene+Cyclohexane,p-Xylene+Dimethyl Sulfoxide[J]. Chem. J. Chinese Universities, 1994, 15(9): 1353.

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Solid-Liquid Phase Equilibria and Excess Gibbs Free Energies for p-Xylene+Cyclohexane,p-Xylene+Dimethyl Sulfoxide

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