Equilibrium Data for PEG 4000 + Salt + Water Systems from (278.15 to 318.15) K
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- 作者：Carolina P. Carvalho ; Jane Sé ; lia R. Coimbra ; Isabele Andressa F. Costa ; Luí ; s Antonio Minim ; Luí ; s Henrique M. Silva ; Maria Cristina Maffia
- 刊名：Journal of Chemical & Engineering Data
- 出版年：2007
- 出版时间：March 2007
- 年：2007
- 卷：52
- 期：2
- 页码：351 - 356
- 全文大小：87K
- 年卷期：v.52,no.2(March 2007)
- ISSN：1520-5134
文摘
Liquid-liquid equilibrium data of aqueous two-phase systems composed of PEG 4000 + sodium sulfate, PEG4000 + 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 ofsalt necessary for phase splitting. From (308.15 to 318.15) K, for the aqueous systems PEG 4000 + lithiumsulfate or potassium phosphate, a small decrease of the STL was verified. In spite of producing a phase diagramwith a larger biphasic area, the sodium sulfate showed higher capability for inducing the phase splitting as comparedto potassium phosphate and lithium sulfate.