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Equilibrium Data for PEG 4000 + Salt + Water Systems from (278.15 to 318.15) K

2007; American Chemical Society; Volume: 52; Issue: 2 Linguagem: Inglês

10.1021/je0602216

1520-5134

Carolina P. Carvalho, Jane Sélia dos Reis Coimbra, Isabele Andressa F. Costa, Luís Antônio Minim, Luís Henrique Mendes da Silva, Maria Cristina Maffia,

Mine drainage and remediation techniques

Liquid−liquid equilibrium data of aqueous two-phase systems composed of PEG 4000 + sodium sulfate, PEG 4000 + lithium sulfate, and PEG 4000 + potassium phosphate were determined from (278.15 to 318.15) K. When the temperature was increased, the slope of the tie line (STL) tended to increase, reducing the quantity of salt necessary for phase splitting. From (308.15 to 318.15) K, for the aqueous systems PEG 4000 + lithium sulfate or potassium phosphate, a small decrease of the STL was verified. In spite of producing a phase diagram with a larger biphasic area, the sodium sulfate showed higher capability for inducing the phase splitting as compared to potassium phosphate and lithium sulfate.