Liquid–Liquid Equilibria of an Aqueous Two-Phase System Containing Poly(ethylene) Glycol 1500 and Sulfate Salts at Different Temperatures

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• 作者：Joã ; o Paulo Martins ; Carolina de Paula Carvalho ; Luis Henrique Mendes da Silva ; Jane Sé ; lia dos Reis Coimbra ; Maria do Carmo Hespanhol da Silva ; Guilherme Dias Rodrigues ; Luis Antonio Minim
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2008
• 出版时间：January 2008
• 年：2008
• 卷：53
• 期：1
• 页码：238 - 241
• 全文大小：74K
• 年卷期：v.53,no.1(January 2008)
• ISSN：1520-5134

文摘

Phase diagrams of aqueous two-phase systems composed of poly(ethylene) glycol (PEG) 1500, lithium sulfate, or magnesium sulfate were determined at (283.15, 298.15, and 313.15) K and of PEG 1500 + sodium sulfate were obtained at (278.15, 298.15, 305.65, and 313.15) K. The temperature effect on the position of the binodal curves was negligible, indicating a small enthalpic contribution to the phase separation process. The ability of the three salts to induce the formation of a biphasic system with PEG 1500 followed the order MgSO₄ > Na₂SO₄ > Li₂SO₄.