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Effect of temperature on the phase equilibrium of aqueous two‐phase polymer systems
Author(s) -
Hartounian H.,
Floeter E.,
Kaler E. W.,
Sandler S. I.
Publication year - 1993
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.690391208
Subject(s) - gibbs free energy , thermodynamics , polyethylene glycol , aqueous solution , polymer , phase (matter) , chemistry , aqueous two phase system , dextran , chromatography , organic chemistry , physics
Abstract We report experimental data showing the effect of temperature on polymer partitioning in the dextran (DEX500)‐polyethylene glycol (PEG8000)‐water system. Increasing temperature increases the concentration of PEG in the top phase and decreases the concentration of DEX in the bottom phase. A solution thermodynamic model based on local compositions with temperature‐dependent parameters correlates the experimental data well, and an efficient Gibbs‐free energy minimization algorithm for phase equilibrium calculations is described. The partial molar enthalpies and entropies of each of the solutes, calculated with the model, are negative and decrease in magnitude as temperature increases.