Thermodynamic Properties of the Azeotropic Mixture of Acetone, Cyclohexane and Methanol  

作　　者：王秀荣 南照东 谭志诚 

机构地区：[1]Library of Qufu Normal University, Qufu, Shandong 273165, China [2]Department of Chemistry, Qufu Normal University, Qufu, Shandong 273165, China [3]Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, Liaoning 116023, China

出　　处：《Chinese Journal of Chemistry》2006年第10期1301-1304,共4页中国化学（英文版）

基　　金：Project supported by the National Natural Science Foundation of China （No. 20073047） and the Doctor Foundation of Shandong Province （No. 2004B S04021 ）.

摘　　要：Molar heat capacities of the pure samples of acetone, methanol and the azeotropic mixture composed of acetone cyclohexane and methanol were measured by an adiabatic calorimeter from 78 to 320 K. The solid-solid and solid-liquid phase transitions of the pure samples and the mixture were determined based on the curve of the heat capacity with respect to temperature. The phase transitions took place at （126.16±0.68） and （178.96±1.47） K for the sample of acetone, （157.79±0.95） and （175.93±0.95） K for methanol, which were corresponding to the solid-solid and the solid-liquid phase transitions of the acetone and the methanol, respectively. And the phase transitions occurred in the temperature ranges of 120 to 190 K and 278 to 280 K corresponding to the solid-solid and the solid-liquid phase transitions of mixture of acetone, cyclohexane and methanol, respectively. The thermodynamic functions and the excess thermodynamic functions of the mixture relative to standard temperature of 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.Molar heat capacities of the pure samples of acetone, methanol and the azeotropic mixture composed of acetone cyclohexane and methanol were measured by an adiabatic calorimeter from 78 to 320 K. The solid-solid and solid-liquid phase transitions of the pure samples and the mixture were determined based on the curve of the heat capacity with respect to temperature. The phase transitions took place at （126.16±0.68） and （178.96±1.47） K for the sample of acetone, （157.79±0.95） and （175.93±0.95） K for methanol, which were corresponding to the solid-solid and the solid-liquid phase transitions of the acetone and the methanol, respectively. And the phase transitions occurred in the temperature ranges of 120 to 190 K and 278 to 280 K corresponding to the solid-solid and the solid-liquid phase transitions of mixture of acetone, cyclohexane and methanol, respectively. The thermodynamic functions and the excess thermodynamic functions of the mixture relative to standard temperature of 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.

关 键 词：azeotropic mixture ACETONE CYCLOHEXANE METHANOL heat capacity 

分 类 号：O642.3[理学—物理化学]