氯化锂在正丙醇-水混合溶剂中的稀释热测定及关联  

Heat of Dilution of LiCl/n-C_3H_7OH-H_2O System

作　　者：洪玲[1] 张雅明[1] 王延儒[1] 时钧[1] 

机构地区：[1]南京化工大学化学工程系,江苏南京210009

出　　处：《高校化学工程学报》2000年第5期453-457,共5页Journal of Chemical Engineering of Chinese Universities

摘　　要：使用LKB 2107型微量热计-微机数据采集系统测量了288.15K、298.15K、308.15K下LiCl/-n-C3H7OH-H2O体系在不同混合溶剂浓度下的稀释热。测量结果用扩展的Debye-H(ckl方程、Pitzer模型和单参数模型关联。计算了方程中的参数和溶液无限稀释热 - (mLiCl=1mol·kg-1溶剂）。结果表明：相同混合溶剂浓度下，-随温度增加而增加；同一温度下， -还与溶剂浓度有关，< 0.88时，随的增大而增大，到0.88左右达最大值。The heat of dilution of LiCl/n-C3H7OH-H2O solution has been measured with LKB 2107 flow microcalorimeter-PC data acquisitor system at 288.15K,298.15K and 308.15K. The experimental results were correlated using the extended form of the Debye-H(ckel limiting law, the ion interaction model of Pitzer and the single parameter model. The parameters of each model were correlated, and the molar enthalpies of dilution at infinite dilution of LiCl（mLiCl=1.0mol·kg-1）for fixed composition of the mixed solvent were obtained. The results indicate that: -(HD( increases with temperature at the same concentration of mixed solvents, and -(HD( changes with the concentration of solvents at the same temperature. The maximum value of -(HD( is at 0.88 (mole fraction of n-propanol).

关 键 词：稀释热 氯化锂 正丙醇 溶液性质 

分 类 号：TQ131.11[化学工程—无机化工] TQ027.35