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Stability calculations for nonequilibrium separation processes
Author(s) -
Sridhar Lakshmi N.,
Torres Monica
Publication year - 1998
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690441007
Subject(s) - non equilibrium thermodynamics , tangent , plane (geometry) , tangent space , work (physics) , stability (learning theory) , separation (statistics) , statistical physics , separation process , mathematics , physics , thermodynamics , computer science , mathematical analysis , chemistry , geometry , chromatography , statistics , machine learning
Two of the most significant contributions in the last two decades to separation process are the numerical implementation of the tangent‐plane criterion to check the stability of any given mixture and the use of mass‐transfer models to solve separation‐process problems. This work combines the use of the tangent‐plane analysis with mass‐transfer models to solve problems with multiple liquid phases. As in equilibrium‐stage problems, the tangent‐plane analysis works effectively with nonequilibrium‐stage separation‐process problems. An example is presented where the nonequilibrium model, when used in conjunction with the tangent‐plane criterion, predicts the correct number of phases, while the equilibrium model predicts the incorrect number of phases.