乙醇在正己烷中的解缔与超额焓

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

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vanderWaals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。

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.