Effect of temperature on the phase equilibrium of aqueous two‐phase polymer systems

H. Hartounian; E. Floeter; E. W. Kaler; S. I. Sandler

doi:10.1002/aic.690391208

Effect of temperature on the phase equilibrium of aqueous two‐phase polymer systems

H. Hartounian, E. Floeter, E. W. Kaler, S. I. Sandler

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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.

Original language	English (US)
Pages (from-to)	1976-1984
Number of pages	9
Journal	AIChE Journal
Volume	39
Issue number	12
DOIs	https://doi.org/10.1002/aic.690391208
State	Published - Dec 1993

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AU - Floeter, E.

AU - Kaler, E. W.

AU - Sandler, S. I.

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AB - 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.

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Effect of temperature on the phase equilibrium of aqueous two‐phase polymer systems

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