氯化锂在甲醇-水溶剂中的稀释热测定及关联  

HEAT OF DILUTION OF LiCl IN CH_3OH-H_2O MIXED SOLVENT SYSTEM

作　　者：张雅明[1] 洪玲 李建峰 王延儒[1] 时钧[1] 

机构地区：[1]南京化工大学化工学院,南京210009

出　　处：《南京化工大学学报》2000年第2期70-73,共4页Journal of Nanjing University of Chemical Technology(Natural Science Edition)

摘　　要：使用 L KB2 1 0 7型微量热计 -微机数据采集系统测量了 2 88.1 5K、2 98.1 5K、30 8.1 5K下 Li Cl- CH3OH-H2 O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- Hückl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 -ΔH∞D( m Li Cl=1 mol/ kg)。结果表明 :相同混合溶剂浓度下 ,-Δ H∞D 随温度增加而增加 ;同一温度下 ,- ΔH∞D 随溶剂浓度 x2 ′的增大而增大。Heat of dilution for LiCl/CH_3OH-H_2O system has been measured with LKB 2107 flow microcalorimeter-PC data acquisitor system at 288.15 K,298.15 K and 308.15 K. The experimental results were correlated using the extended form of the Debye-Hückel 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(m_LiCl=1.0 mol/kg)for fixed composition of the mixed solvent were obtained. The results indicate that ΔH_D∞ increases with temperature at the same concentration of mixed solvents, and ΔH_D∞ increases with the concentration of solvents at the same temperature.

关 键 词：稀释热 氯化锂 甲醇 水溶剂 电解质溶液 

分 类 号：O646.1[理学—物理化学] O645.13[理学—化学]