Thermodynamic equilibrium of the polyethylene glycol 2000 and sulphate salts solutions

被引：7

作者：

Jahani, Farahnaz ^{[1
]}

Abdollahifar, Mozaffar ^{[1
]}

Haghnazari, Nahid ^{[2
]}

机构：

[1] Islamic Azad Univ, Dept Chem Engn, Kermanshah Branch, Kermanshah, Iran

[2] Islamic Azad Univ, Dept Chem, Sanandaj Branch, Sanandaj, Iran

来源：

JOURNAL OF CHEMICAL THERMODYNAMICS | 2014年 / 69卷

关键词：

(Vapour plus liquid) equilibrium; Polyethylene glycol 2000; Sulphate salts; Isopiestic; Binodal; Activity; LIQUID-LIQUID EQUILIBRIUM; AQUEOUS 2-PHASE SYSTEMS; POLY(PROPYLENE GLYCOL); WATER; TEMPERATURE; PHOSPHATE;

D O I：

10.1016/j.jct.2013.10.015

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

In this research, the (liquid + liquid) and (vapour + liquid) equilibria of polyethylene glycol 2000 with salts Na2SO4, ZnSO4, (NH4)(2)SO4, Al-2(SO4)(3) and MgSO4 were investigated. Constant water activity curves and water activity data for the (vapour + liquid) equilibrium have been measured using the isopiestic method at T = 298.15 K. Furthermore, binodal values of aqueous two- phase systems for (liquid + liquid) equilibrium were determined at T = (298.15 and 308.15) K. A relation between the salting- out effect of electrolytes on the polymer aqueous solution and the slopes of constant water activity curves are reported. It was found that the slopes of constant water activity curves of aqueous two- phase systems, in two- phase and one- phase regions, have positive and negative deviation, respectively, from the linear isopiestic relation. Finally, the effect of temperature and cation of sulphate salts on the (liquid + liquid) and (vapour + liquid) equilibria was investigated. (C) 2013 Elsevier Ltd. All rights reserved.

引用

页码：125 / 131

页数：7

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