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Improving prediction of salt effect on vle of isopropyl alcohol‐h 2 o‐salt and methanol‐h 2 o‐salt systems with preferential association
Author(s) -
Lee LiangSun,
Tsao YungZin,
Yang Barry L. M.
Publication year - 1991
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.5450690322
Subject(s) - salt (chemistry) , isopropyl alcohol , chemistry , methanol , solubility , alcohol , thermodynamics , isopropyl , double salt , inorganic chemistry , organic chemistry , physics
When a salt is added to an azeotropic mixture, the azeotropic composition tends to shift or even disappear, due to salt‐in and salt‐out effects. Models from the literature are applied to calculate the vapor‐liquid equilibrium of systems of isopropyl alcohol H 2 O‐salt, and methanol H 2 O‐salt. Schmitt and Vogelpohl's model (1982) gives the best results. With the concept of preferential association, an improvement can be accomplished through the modified distribution factor of the salt associating with components of the mixture for the systems mentioned above. Owing to the lack of solubility data of the salt in the individual components of the azeotropic mixture, the generality of this modification has not yet been demonstrated.