Acta Phys. -Chim. Sin. ›› 2004, Vol. 20 ›› Issue (01): 85-89.doi: 10.3866/PKU.WHXB20040118

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Isobaric Vapor-Liquid Equilibria of Maleic Anhydride-DIBE System Using a Small Modified Ebulliometer

Chen Li;Tian Yi-Ling;Zhao Xue-Feng;Fu Hua-Feng;Li Yong-Bo   

  1. Department of Chemistry, School of Science, Tianjin University, Tianjin　300072
  • Received:2003-06-30 Revised:2003-08-19 Published:2004-01-15
  • Contact: Tian Yi-Ling E-mail:tianyiling@eyou.com

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Abstract: T, p data for Maleic anhydride and DIBE (di-isobutylhexahydrophthalate) at different feed compositions(q) have been measured with a small modified ebulliometer and T, q data under different pressures have been obtained through interpolation. The vapor-liquid equilibrium data have been calculated by means of the parameters of NRTL equation optimized by the simplex method. The azeotropes are found to change obviously with the pressures. The azeotropes tend to disappear when the pressure is lowered to 20 kPa.

Key words: Maleic anhydride, DIBE(di-isobutylhexahydrophthalate), NRTL equation, Isobaric vapor-liquid equilibrium