3种离子交换相平衡模型在Tau/OH~-体系中的比较

在牛磺酸/氢氧根相平衡体系下,对计量置换模型、异质作用模型和改进的Langmuir模型的计算精度等特性进行了比较。采用静态法进行牛磺酸/氢氧根体系的离子交换平衡实验,测定30℃下的离子交换等温线;分别使用计量置换模型、异质作用模型和改进的Langmuir模型方程对相平衡数据进行拟合得到相关模型参数。结果表明:改进的Langmuir模型在一定牛磺酸浓度范围内可以正确地描述Tau/OH-体系的相平衡,拟合结果优于计量置换模型和异质作用模型。

Comparison of three ion exchange equilibrium models in Tau/OH~- system

The characteristics such as calculation accuracy of three ion exchange phase equilibrium models,i.e.,the stoichiometric displacement model,the heterogeneous action model and the improved Langmuir model,were compared in Tau/OH-system.The ion exchange equilibrium experiment was made by static method,and the ion exchange isotherm at 30 ℃ was determined.The equilibrium data were fitted by three ion exchange equilibrium equations,and the related model parameters were obtained.The results show that the improved Langmuir model fits the ion exchange equilibrium of Tau/OH-system very well in a certain concentration range of taurine,and the fitted data of improved Langmuir model are better than those of stoichiometric displacement model and heterogeneous action model.