化工学报2019，Vol.70Issue(3)：830-839,10.DOI:10.11949/j.issn.0438-1157.20181154
KCl-PEG4000-H2O三元体系288、298、308K相平衡测定及计算
Measurements and simulation for ternary system KCl-PEG4000-H2O at 288, 298 and 308 K
摘要
Abstract
The phase equilibrium relationship of the ternary system KCl-PEG4000-H2O at 288, 298 and 308 K was studied by isothermal dissolution equilibrium method. The corresponding phase diagram, density-composition diagram and refractive index-composition diagram were drawn. The results show that over the entire PEG 4000 composition rang studied only one liquid phase is obtained, without the biphase region formed at 288, 298 and 308 K. The phase diagram of system KCl-PEG4000-H2O consists of one homogeneous area with unsaturated liquid (L), an equilibrium area containing the solid phase of KCl and saturated liquid phase (S+L), one area with one liquid phase and two solid phases(2S+L). The area of (2S+L) decrease with the increasing of temperature, while the areas of (L) and (S+L) increase with the increasing of temperature. The solubility of KCl decreases with the addition of PEG 4000 at 288, 298 and 308 K. When wPEG4000 in the solution is less than 0.50, the temperature has little effect on the salting-out ratio of the system, while when wPEG4000 is higher than 0.50, the salting-out ratio of the system decreases with the increasing of temperature. The thermodynamics calculation of equilibrium data of system KCl-PEG4000-H2O at 288, 298 and 308 K was carried out by using the modified Pitzer equation, it can be seen from the comparison of experimental and calculation diagrams that the predictive solubilities agree well with the experimental values.关键词
相平衡/热力学性质/溶解性/混合溶剂/Pitzer方程Key words
phase equilibria/thermodynamic properties/solubility/mixed solvents/Pitzer equation分类
化学化工引用本文复制引用
于旭东,黄琴,王林,李茂兰,郑洪,曾英..KCl-PEG4000-H2O三元体系288、298、308K相平衡测定及计算[J].化工学报,2019,70(3):830-839,10.基金项目
国家自然科学基金项目(U1507111) （U1507111）
