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Solid-Liquid Equilibria and thermodynamic correlation for the ternary system (KCl + PEG10000/20000 + H2O) at 288.2 K and 298.2 K
The Journal of Chemical Thermodynamics ( IF 2.6 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.jct.2020.106221
Qin Huang , Maolan Li , Lin Wang , Xudong Yu

Abstract This work finished measuring the phase equilibria of ternary systems {KCl + polyethylene glycol (PEG) 10000/20000 + H2O} at 288.2 and 298.2 K. The solubility, density and refractive index were determined and corresponding diagrams were plotted in this work. There was only solid–liquid phase equilibrium existing in the ternary systems {KCl + PEG10000/20000 + H2O} at 288.2 K and 298.2 K. All of the phase diagrams of four systems are divided into three parts which respectively are the regions of unsaturated homogeneous liquid (L), one liquid and one solid KCl (L + S), and one liquid and two solids KCl and PEG (L + 2S). In addition, the effects of molar mass of PEG (PEG1000/4000/10000/20000) and temperature (288.2 K and 298.2 K) on phase equilibria were discussed. Results show that the sizes of regions of (L) and (L + S) increased and that of (L + 2S) decreased with the increase of temperature, and the regions of (L) and (L + S) decreased and that of (L + 2S) increased with the increase of the molar mass of PEG. The modified Pitzer model was adopted as the equilibrium thermodynamics model to correlate the experimental data. Comparing the experimental data and calculated dada, it can give a precise result with small error.

中文翻译:

三元系统 (KCl + PEG10000/20000 + H2O) 在 288.2 K 和 298.2 K 下的固液平衡和热力学相关性

摘要 本工作完成了三元体系{KCl + 聚乙二醇(PEG) 10000/20000 + H2O}在288.2和298.2 K下的相平衡测量,确定了溶解度、密度和折射率,并绘制了相应的图表。在288.2 K和298.2 K的三元体系{KCl + PEG10000/20000 + H2O}中仅存在固液相平衡。四个体系的所有相图分为三部分,分别是不饱和均相区域液体 (L),一种液体和一种固体 KCl (L + S),以及一种液体和两种固体 KCl 和 PEG (L + 2S)。此外,还讨论了PEG的摩尔质量(PEG1000/4000/10000/20000)和温度(288.2 K和298.2 K)对相平衡的影响。结果表明,(L)和(L+S)区域尺寸随着温度的升高而增大,(L+2S)区域尺寸减小,(L)和(L+S)区域尺寸减小, (L+2S)随着PEG摩尔质量的增加而增加。采用修正的 Pitzer 模型作为平衡热力学模型来关联实验数据。比较实验数据和计算数据,可以给出精确的结果,误差很小。
更新日期:2020-11-01
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