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Liquid−Liquid Equilibrium of Aqueous Two-Phase Systems Containing Poly(ethylene) Glycol 4000 and Zinc Sulfate at Different Temperatures

2008; American Chemical Society; Volume: 53; Issue: 4 Linguagem: Inglês

10.1021/je700493t

ISSN

1520-5134

Autores

Rosana Moura de Oliveira, Jane Sélia dos Reis Coimbra, Kelly R. Francisco, Luís Antônio Minim, Luís Henrique Mendes da Silva, José Antônio Marques Pereira,

Tópico(s)

Ionic liquids properties and applications

Resumo

Liquid–liquid equilibrium data of aqueous two-phase systems composed of polyethylene(glycol) (PEG) 4000 + zinc sulfate at (5, 10, 35, and 45) °C were measured. The effect of temperature in the systems was studied. The expansion of the two-phase area with the increase in temperature from (5 to 35) °C and also a small reduction of the biphasic region from (35 to 45) °C were observed. The slope of all tie lines increased with the temperature increase. The tie line length increased in the ranges of (5 to 25) °C and (35 to 45) °C and decreased from (25 to 35) °C.

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