Liquid−Liquid Equilibrium Data for Aqueous Two-Phase Systems Composed of Ethylene Oxide Propylene Oxide Copolymers
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Institute for Biotechnology and Bioengineering (IBB), Centre for Biological and Chemical Engineering, Instituto Superior Técnico, Av. Rovisco Pais, 1049-001 Lisbon, Portugal, and Biochemistry and Molecular Biology Department, Federal University of Ceará (UFC), CP 6033, CEP 60.451-970 Fortaleza, Ceará, Brazil
* To whom correspondence should be addressed. E-mail: [email protected]
†Instituto Superior Técnico.
‡Federal University of Ceará.
Abstract
Phase equilibrium of aqueous two-phase systems (ATPS) containing UCON 50 HB-2000 + potassium phosphate and UCON 50 HB-2000 + sodium citrate were investigated in this work. The effect of temperature and type of salt were determined at (277.15, 298.15, and 313.15) K in pH 6.0, 7.0, and 8.0. Increasing the temperature of the phase system leads to an increase in the slope of the tie-line (STL) and in the tie-line length (TLL) causing a shift in the binodal position toward the origin. Sodium citrate showed a better capability to induce phase separation than potassium phosphate.
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