A nonclassical model of a type 2 mixture with vapor-liquid, liquid-liquid, and three-phase equilibria

被引：5

作者：

Rainwater, JC ^{[1
]}

机构：

[1] Natl Inst Stand & Technol, Phys & Chem Properties Div, Chem Sci & Technol Lab, Boulder, CO 80303 USA

来源：

INTERNATIONAL JOURNAL OF THERMOPHYSICS | 2000年 / 21卷 / 03期

关键词：

carbon dioxide; critical exponents; liquid-liquid equilibria; methane; three-phase locus; Type; 2; mixture; vapor liquid equilibria;

D O I：

10.1023/A:1006645603685

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

A model with nonclassical exponents is developed for phase equilibria of a Type 2 mixture with vapor liquid equilibrium (VLE) and liquid-liquid equilibrium (LLE). Starting with a Leung-Griffiths model for a Type I mixture with only VLE, the model adds a Schofield parametric construction to describe LLE and a three-phase locus. Care is taken to suppress a spurious and artificial phase boundary. The model is applied to VLE data of ml bon dioxide + methane. It is conjectured that this mixture upon cooling would undergo liquid liquid separation, hut it freezes before such "virtual LLE" can be observed. Experimental bubble curves and the LLE structure from a classical equation of state are accurately modeled.

引用

页码：719 / 737

页数：19

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