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Pathwardhan-Kumer密度规则及基于线性等压关系的密度规则可适性的研究

胡玉峰   

  1. The State Key Laboratory of Heavy Oil Processing, University of Petroleum, Beijing 102200,
    China
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2001-09-28 发布日期:2001-09-28
  • 通讯作者: 胡玉峰

The Applicability of the Density Rule of Pathwardhan and Kumer and the Rule Based on Linear
Isopiestic Relation

HU Yufeng   

  1. The State Key Laboratory of Heavy Oil Processing, University of Petroleum, Beijing 102200,
    China
  • Received:1900-01-01 Revised:1900-01-01 Online:2001-09-28 Published:2001-09-28
  • Contact: HU Yufeng

摘要: The applicability of the density rule of Pathwardhan and Kumer and the rule based on the
linear isopiestic relation is studied by comparison with experimental density data in the
literature. Predicted and measured values for 18 electrolyte mixtures are compared. The two
rules are good for mixtures with and without common ions, including those containing
associating ions. The deviations of the rule based on the linear isopiestic relation are
slightly higher for the mixtures involving very strong ion complexes, but the predictions
are still quite satisfactory. The density rule of Pathwardhan and Kumer is more accurate
for these mixtures. However, it is not applicable for mixtures containing non-electrolytes.
The rule based on the linear isopiestic relation is extended to mixtures involving non-
electrolytes. The predictions for the mixtures containing both electrolytes and non-
electrolytes and the non-electrolyte mixtures are accurate. All these results indicate that
this rule is a widely applicable approach.

关键词: binary density rules;density;apparent molar volume;multicomponent system;binary sub- system

Abstract: The applicability of the density rule of Pathwardhan and Kumer and the rule based on the
linear isopiestic relation is studied by comparison with experimental density data in the
literature. Predicted and measured values for 18 electrolyte mixtures are compared. The two
rules are good for mixtures with and without common ions, including those containing
associating ions. The deviations of the rule based on the linear isopiestic relation are
slightly higher for the mixtures involving very strong ion complexes, but the predictions
are still quite satisfactory. The density rule of Pathwardhan and Kumer is more accurate
for these mixtures. However, it is not applicable for mixtures containing non-electrolytes.
The rule based on the linear isopiestic relation is extended to mixtures involving non-
electrolytes. The predictions for the mixtures containing both electrolytes and non-
electrolytes and the non-electrolyte mixtures are accurate. All these results indicate that
this rule is a widely applicable approach.

Key words: binary density rules, density, apparent molar volume, multicomponent system, binary sub- system