K^+, Na^+//Cl^-,SO_4^(2-),NO_3^--H_2O体系热力学研究

Thermodynamic model of the system K^+, Na^+//Cl^-,SO_4^(2-),NO_3^--H_2O

通过引入表达离子缔合或离子间的短程静电作用项,提高了局部组成模型关联单一电解质水溶液体系热力学性质的精度,并通过建立新的计算多元混合体系作用参数的方法,将其推广应用到多离子电解质溶液体系。在此基础上,预测了Na+//Cl-,SO2-3,H2O、K+//Cl-,SO2-4,NO-4,NO-3,H2O、K+,Na+//Cl-,SO2-4,H2O、K+,Na+//Cl-,NO-3,H2O3,H2O、K+,Na+//SO2-4,NO-3,H2O5个四元体系及K+,Na+//Cl-,SO2-4,NO-五元体系的溶解度,模型参数均通过上述体系所包含的二元、三元体系的溶解度数据获得,计算结果满意。

With introducing a term to present ion association and developing a new method to calculate the energy parameters of multicomponent electrolyte solution, the electrolyte nonrandom twoliquid model proposed by Chen C. C. was improved, and could be used for mixtures containing an indefinite number of ions of arbitrary charge. As a result, the solubilities were predicted for the system Na+//Cl-,SO2-4,NO-3,H2O?K+//Cl-,SO2-4,NO-3,H2O?K+,Na+//Cl-,SO2-4,H2O?K+,Na+//Cl-,NO-3,H2O?K+,Na+//SO2-4,NO-3,H2O?K+,Na+//Cl-,SO2-4,NO-3,H2O, all parameters were determined only from the liquidsolid equilibrium data of the binary and ternary systems. The solubilities predicted agree with the data in literature very well.