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A modified heil‐prausnitz equation for excess gibbs energy
Author(s) -
Vetere Alessandro
Publication year - 1977
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450550113
Subject(s) - non random two liquid model , thermodynamics , ternary operation , binary number , chemistry , gibbs free energy , activity coefficient , physics , mathematics , arithmetic , aqueous solution , computer science , programming language
An equation for the Gibbs excess energy, similar to that of Heil‐Prausnitz, is derived on the basis of the lattice theory of fluids. This equation takes into account both the enthalpic and entropic contributions to G E for liquid mixtures, and in addition uses the α ij parameter of Renon‐Prausnitz. It is compared in the one‐ and two‐parameter forms with the analogous equations of Wilson, NRTL and Heil‐Prausnitz for 44 binary liquid‐vapour systems, and with the NRTL equation for 2 ternary liquid‐liquid systems. Rules are given for calculating the α ij parameter. Methods are also reported for predictive calculations of the binary interaction parameter g 12 based on the properties of the pure fluids.