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BIBTEX RIS

Liquid−Liquid Equilibrium of Aqueous Two-Phase System Composed of Poly(ethylene glycol) 400 and Sulfate Salts

2009; American Chemical Society; Volume: 55; Issue: 3 Linguagem: Inglês

10.1021/je9006162

ISSN

1520-5134

Autores

João Paulo Martins, Jane Sélia dos Reis Coimbra, Fabíola Cristina de Oliveira, Guilherme Sanaiotti, César A. S. da Silva, Luís Henrique Mendes da Silva, Maria do Carmo Hespanhol da Silva,

Tópico(s)

Ionic liquids properties and applications

Resumo

Phase diagrams of aqueous two-phase systems (ATPS) composed of 400 g·mol−1 poly(ethylene glycol) (PEG) + sodium sulfate or magnesium sulfate were determined at (298.15, 308.15, and 318.15) K. The temperature effect on the biphasic area was not relevant, indicating a small enthalpic contribution associated with the phase separation. The ability of the salts in inducing the formation of the ATPS with PEG 400 followed the order sodium sulfate < magnesium sulfate. The liquid−liquid equilibrium experimental data were correlated using the NRTL (nonrandom two-liquid) activity coefficient model, and new interaction parameters were estimated. The mean deviations between calculated and experimental compositions were lower than 0.99 %, showing the good descriptive quality and applicability of the NRTL model.

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