内压与液体混合物的超额焓

本文在前文提出的通用液体混合模型的基础上, 对其中某些近似假设和混合规则进行了合理的修正, 从而得到了一个液体混合物的超额焓与组分内压间的关系式。对于正常液体混合物, 式中有两个可调的修正系数, 对于醇-烃混合物, 则有三个可调参数。对十六个二元液体混合物的计算结果表明, 关系式不仅能准确地描述一般液体混合物的超额焓随浓度的变化规律, 而且亦适用于具有S型H^E-x曲线的复杂液体混合物。

Insternal pressure and excess enthalpy of liquid mixtures

Based on the general mixing model of liquids suggested by our previous work, the reasonable modifications are performed for some approximate assumptions and mixing rules. A relationship between the excess enthalpy of liquid mixture and the internal pressure of components is obtained, which has two adjustable correct coefficients for normal liquid mixtures and three for alcohol-hydrocarbon mixtures. The calculated results for sixteen binary liquid mixtures show that the relationship not only can describe the variation of excess enthalpy with the concentration for ordinary liquid mixtures, but also can apply to the complex systems which have S-shaped curves in the H^E-x diagram.