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Eine Näherung zur Voraussage des Zusatzvolumens binärer nichtassoziierter Mischungen

Estimation of the excess volume of binary nonassociated mixtures

Abstract

The excess volume of simple binary liquid nonassociated mixtures is calculated from data of the excessGibbs free energy and the enthalpy of mixing using a relationship between the excess volume and the excess entropy at constant pressure and at constant volume given byScatchard 1. Estimation of the excess entropy at constant volume for component molecules of equal size is based on theScatchard-Hildebrand 2,3 concept, differences in molecular size are taken into account by a separateFlory-Huggins 4,5 term.

The proposed correlation provides a reasonable estimate of the excess volume from easily obtainable macroscopic properties without any fitting parameters. The method was tested on 31 systems and only in two cases where the excess volume is very small, the sign is incorrectly predicted.

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Author information

Correspondence to Dr. Ernst Liebermann.

Additional information

Herrn Prof. Dr.Hans Nowotny zum 65. Geburtstag in Verehrung gewidmet.

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Liebermann, E. Eine Näherung zur Voraussage des Zusatzvolumens binärer nichtassoziierter Mischungen. Monatshefte für Chemie 108, 505–515 (1977). https://doi.org/10.1007/BF00912793

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