Equilibrium Phase Behavior of Poly(ethylene glycol) + Potassium Phosphate + Water Two-Phase Systems at Various pH and Temperatures

This work presents the effects of changes in temperature (4 °C, 25 °C, and 40 °C), pH (6, 7, and 9), and polymer molecular weight (1000 and 8000) on the equilibrium phase behavior of two-phase PEG + potassium phosphate + water systems. As the temperature and pH were increased, the binodal curve shif...

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Bibliographic Details
Published in:Journal of chemical and engineering data 1997-03, Vol.42 (2), p.398-401
Main Authors: Silva, Luiza Helena Meller da, Coimbra, Jane S. R, Meirelles, Antonio José de A
Format: Article
Language:English
Subjects:
Chemistry
Exact sciences and technology
General and physical chemistry
Liquid-liquid equilibria
Phase equilibria
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Summary:This work presents the effects of changes in temperature (4 °C, 25 °C, and 40 °C), pH (6, 7, and 9), and polymer molecular weight (1000 and 8000) on the equilibrium phase behavior of two-phase PEG + potassium phosphate + water systems. As the temperature and pH were increased, the binodal curve shifted to lower polyethylene and phosphate concentrations, resulting in a higher difference in polymer and salt concentrations between the top and bottom phases. This corresponds to an increase in the region of two-phase coexistence.
ISSN:0021-9568
1520-5134
DOI:10.1021/je9602677