物理化学学报 >> 2002, Vol. 18 >> Issue (05): 441-445.doi: 10.3866/PKU.WHXB20020512

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乙醇在正己烷中的解缔与超额焓

章丽辉;黑恩成;刘国杰   

  1. 华东理工大学化学系,上海　200237
  • 收稿日期:2001-09-14 修回日期:2001-11-26 发布日期:2002-05-15
  • 通讯作者: 刘国杰 E-mail:zlh304@elong.com

Dissociation of Selfassociation of Ethanol in nHexane and Excess Enthalpies of the Mixture

Zhang Li-Hui;Hei En-Cheng;Liu Guo-Jie   

  1. Chemistry Department,East China University of Science and Technology,Shanghai　200237
  • Received:2001-09-14 Revised:2001-11-26 Published:2002-05-15
  • Contact: Liu Guo-Jie E-mail:zlh304@elong.com

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摘要： 测定了不同温度和浓度下乙醇与正己烷液体混合物的热压力系数及内压,并用修正的van der Waals模型关联了这些实验数据,从模型参数B/A2得到了一个乙醇自缔合随组成而遭破坏程度的公式.根据这个公式设想了一个醇与烃的混合模型,建立了混合物的超额焓方程,它能够满意地描述上述混合物的超额焓随组成的变化规律,并显示物理和化学作用对HE的贡献

关键词: 乙醇与正己烷混合物, 内压, 修正的van der Waals模型, 解缔, 超额焓

Abstract: The thermal pressure coefficients and internal pressures of ethanol＋nhexane liquid mixtures have been measured at different temperatures and compositions.These experimental data are corrected with modified van der Waals model proposed in our previous work.From the parameter of this model B/A2 ,a formula describing the relationship between the dissociation degree of selfassociation and the composition of ethanol in the mixture is obtained.Based on this formula,a model is designed for the mixing of alcohols and hydrocarbons and the equation which can be satisfactorily used to describe the variation of excess enthalpies with the composition are established.It can clearly display the contributions of the physical and chemical action to the excess enthalpies.

Key words: Mixtures of ethanol and nhexane, Internal pressure, Modified van der Waals′ model, Dissociation of selfassociation, Excess enthalpy