Equilibrium data for PEG 4000 plus salt plus water systems from (278.15 to 318.15) K

被引：62
作者：
Carvalho, Carolina P.
Coimbra, Jane Selia R.
Costa, Isabele Andressa F.
Minim, Luis Antonio
Silva, Luis Henrique M.
Maffia, Maria Cristina
机构：
[1] Univ Fed Vicosa, LPS, Dept Food Technol, BR-36570000 Vicosa, MG, Brazil
[2] Univ Fed Vicosa, LPS, Dept Chem, BR-36570000 Vicosa, MG, Brazil
来源：
JOURNAL OF CHEMICAL AND ENGINEERING DATA | 2007年 / 52卷 / 02期
关键词：
D O I：
10.1021/je0602216
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
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.
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页码：351 / 356
页数：6
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