热力学模型对KCl-K_2SO_4-H_2O体系溶解度的预测  

Solubility Prediction of System KCl-K_2SO_4-H_2O Using Thermodynamic Model

作　　者：尹霞[1] 汪琼[1] 吴玉双[1] 

机构地区：[1]湖南大学化学化工学院,湖南长沙410082

出　　处：《湖南大学学报（自然科学版）》2011年第2期65-69,共5页Journal of Hunan University:Natural Sciences

基　　金：湖南大学'中央高校基本科研业务费'资助

摘　　要：用Pitzer-Si monson-Clegg热力学模型(PSC模型)和Pitzer模型,结合KCl-H2O,K2SO-4H2O以及KCl-K2SO-4H2O体系水活度和溶解度实验数据,分别计算KCl-H2O体系和K2SO-4H2O体系的溶解度相图,及KCl-K2SO-4H2O体系在273.15 K,298.15 K,323.15 K和348.15 K的溶解度.结果表明对于溶解度较低的KCl-K2SO4-H2O体系,Pitzer模型仅用二元参数得到的计算值与实验值一致,而PSC模型需考虑三元离子相互作用参数.The solubility of the KCl-K2SO4-H2O system was simulated at a wide range of temperatures by using PSC model and Pitzer model.The experiment water activity and experiment solubility in the binary KCl-H2O,K2SO4-H2O and ternary KCl-K2SO4-H2O systems were used to obtain the model parameters.For the KCl-K2SO4-H2O system of low solubility,the Pitzer model values are in agreement with the experiment data just by using binary coefficients,and the PSC model should take into account the ternary coefficients.

关 键 词：热力学模型 溶解度 KCl-K2SO4-H2O体系 水活度 

分 类 号：O642[理学—物理化学]