Pitzer理论在高浓碱性NaOH-H_2O体系溶解度计算中的应用  

Application of Pitzer Theory in the Calculation of Solubility in NaOH-H_2O System of High Hydroxyl Concentration

作　　者：余劲松[1] 郑平友[1] 张淑萍[1] 刘芙蓉[1] 

机构地区：[1]西安交通大学能源与动力工程学院化学工程系,西安710049

出　　处：《科学技术与工程》2006年第8期998-1001,共4页Science Technology and Engineering

摘　　要：将Pitzer理论应用于20℃—50℃NaOH-H2O体系溶解度计算,提出Pitzer模型中的经验常数a和b是温度的函数。从文献提供的该体系活度系数和渗透系数数据拟合出NaOH的Pitzer单盐参数β(0)、β(1)和CΦ、平衡常数与温度的函数关系式。用得到的这些参数计算20℃—50℃NaOH在水中的溶解度,平均误差为0.75%,最大误差为1.55%。说明得到的参数适用于高浓碱性单电解质体系溶解度计算,为高浓体系溶解度计算提供一种可行的方法,扩大了Pitzer理论的应用范围。Pitzer theory was applied to calculate solubility in NaOH-H2O system from 20℃ to 50℃. The empirical constants （a, b） were considered as function of temperature.The Pitzer parameters （β^（0）、β^（1）、C^Ф） and equilibrium constant of NaOH were regressed from the literature data. Adopting these parameters got, the solubility of NaOH in the NaOH-H2O system was calculated. The maximum error between the calculated and literature value was 1.55% and the average error was 0.75%, indicating that the Pitzer theory can be used to calculate electrolyte solubility in alkali system of high hydroxyl concentration. The applied range of Pitzer model was extended.

关 键 词：PITZER理论 活度系数 渗透系数 溶解度 

分 类 号：TQ013.1[化学工程]