亚氨基二乙酸-氯化钠-水三元体系溶解度模型  

Thermodynamic model on solubility of IDA-NaCl-H_2O

作　　者：吴俊[1] 杨运泉[1] 罗和安[1] 段正康[1] 叶洪平[1] 

机构地区：[1]湘潭大学化工学院,湖南湘潭411105

出　　处：《化学工程》2006年第1期44-47,共4页Chemical Engineering(China)

基　　金：湖南省自然科学基金项目(01JJY2010);湖南省科技攻关项目(02GKY3023)

摘　　要：根据电解质溶液理论,对Nass和P inho等人提出的氨基酸在NaC l水溶液中溶解度的UNIFAC模型特点进行了分析比较。采用Chen等人提出的电解质型三元体系NRTL活度系数关联方程,结合考虑Born项和P itzer-Debye-Hückel项对基团间长程相互作用力的贡献,在简化基础上,建立了计算IDA-NaC l-H2O三元体系溶解度数学模型。采用该模型对此体系0—60℃范围内的溶解度随温度变化关系进行关联计算,并与实测结果进行对比分析,结果令人满意,二者的平均相对误差为2.93%。按照基团静电作用机制,理论解释了NaC l浓度对IDA溶解度的影响规律。According to the equilibrium theory of electrolyte solution system, the characteristics of UNIFAC models for amino acid solubility in NaCl-H2O supposed by Nass and Pinho were analyzed. Taking into account of the contribution by Born item and Pitzer-Debye-Hückel item to the long-range force between the groups, an extended electrolyte NRTL model of Chen was established and applied to the ternary system consisting of IDA-NaCl-H2O. By the model, the solubility of IDA at different NaCl concentrations and at the temperatures from 0-60 ℃ were correlated and predicted. The modeling results are coincided well with the experimental data, the relative deviation is under 2.93%. The effect of NaCl concentration on the solubility of IDA was explained theoretically by static interaction mechanism of the groups.

关 键 词：亚氨基二乙酸 活度系数 溶解度 NRTL模型 

分 类 号：O645.12[理学—物理化学]