摘要
用全自动低温绝热量热计测定了水和正丙醇组成的共沸混合物(x(H2O)=0.568,x(nC3H7OH)=0.432)在80～320K温区的摩尔热容.建立了共沸混合物与温度T的函数关系.结果表明:水和正丙醇组成的共沸混合物在102.04K发生玻璃态转化,在258.17K发生固液相变,并获得了其相应的相变焓和相变熵.计算了以298.15K为基准的该共沸混合物的热力学函数.
The molar heat capacities of the azeotropic mixture composed of water and n-propanol were measured by an adiabatic calorimeter in temperature range from 80 to 320?K.The functions of the heat capacity with respect to thermodynamic temperature were established.The glass transition occurred at 102.04?K.The solid-liquid phase transition took place at 258.17?K.The melting enthalpy and entropy were calculated to be 5.869?kJ/mol and 22.73?J/(K·mol),respectively.The thermodynamic functions of the azeotropic mixture relative to 298.15?K were derived based on the relationships of the thermodynamic functions and the function of the measured heat capacity with respect to temperature.
出处
《河北师范大学学报（自然科学版）》
CAS
北大核心
2005年第2期173-176,192,共5页
Journal of Hebei Normal University：Natural Science
基金
国家自然科学基金资助项目(20373072)
