THERMODYNAMICS OF AMMONIUM-SULFATE POLYETHYLENE-GLYCOL AQUEOUS 2-PHASE SYSTEMS .2. CORRELATION AND PREDICTION USING EXTENDED UNIFAC EQUATION

被引：41

作者：

GAO, YL

PENG, QH

LI, ZC

LI, YG

机构：

[1] Department of Chemical Engineering, Tsinghua University, Beijing

来源：

FLUID PHASE EQUILIBRIA | 1991年 / 63卷 / 1-2期

关键词：

D O I：

10.1016/0378-3812(91)80029-U

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

An extended UNIFAC equation is proposed for the correlation and prediction of liquid-liquid equilibrium data for ammonium sulfate-polyethylene glycol (PEG) aqueous two-phase systems. The Fowler-Guggenheim equation is also used to calculate the long-range electrostatic interactions of the ions, taking into account the ion association of NH4+ and SO4(2-) in both phases. Three experimental series with the PEG molecular weight of 1000, 1540 and 2000 were used to regress the UNIFAC group interaction parameters needed in the proposed equation, and the series with the PEG molecular weight of 4000 is predicted. The results show that the extended UNIFAC equation has good predictive capability.

引用

页码：173 / 182

页数：10

共 8 条

[1]

Davies C.W., 1962, ION ASS

[2]

FOWLER R, 1956, STATISTICAL THERMODY

[3] UNIFAC AND RELATED GROUP-CONTRIBUTION MODELS FOR PHASE-EQUILIBRIA [J].