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

被引：44

作者：

Martins, Joao Paulo ^{[2
]}

dos Reis Coimbra, Jane S. ^{[1
]}

de Oliveira, Fabiola Cristina ^{[1
]}

Sanaiotti, Guilherme ^{[3
]}

da Silva, Cesar A. S. ^{[3
]}

Mendes da Silva, Luis Henrique ^{[2
]}

da Silva, Maria do Carmo H. ^{[2
]}

机构：

[1] Univ Fed Vicosa, Dept Food Technol, LPS, BR-36570000 Vicosa, MG, Brazil

[2] Univ Fed Vicosa, Dept Chem, BR-36570000 Vicosa, MG, Brazil

[3] Univ Estadual Campinas, Dept Food Engn, Fac Food Engn, ExTrAE,Lab Extract Appl Thermodynam & Equilibrium, BR-13083862 Campinas, SP, Brazil

来源：

JOURNAL OF CHEMICAL AND ENGINEERING DATA | 2010年 / 55卷 / 03期

关键词：

MAGNESIUM-SULFATE; TEMPERATURES; PARTITION; ACID;

D O I：

10.1021/je9006162

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

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 oil 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.

引用

页码：1247 / 1251

页数：5

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