二元有机液体混合物热容与过剩热容的测定  

Measurement and Investigation of Heat Capacity and Excess Heat Capacity of Binary Liquid Mixture

作　　者：孙宏伟[1] 高铭书[2] 马沛生[2] 

机构地区：[1]北京化工大学化工系,北京100029 [2]天津大学化学工程系,天津300072

出　　处：《物理化学学报》1996年第6期537-542,共6页Acta Physico-Chimica Sinica

摘　　要：The heat capacities C_p and excess heat capaciries C_p^E of four binarysystems cyclohexanone-benzene, cyclohexanone-toluene, cyclohexanone-elhylbenzene,cyclohexanone-isopropylbenzene are measured at 298.15K and under latm by the Calvet microcalorimeter.The error of mole fraction is ±0.0002, of C_p±0.0085, of C_p^E±0.055,arld of temperature ±0.01K. The C_p^E values of the four systems are always positive forwhole ranges of mole fractions. The excess heat capacities decrease with the increase ofnumber of carbon atoms of aromatic hydrocarbon. The experimental results are at variance with the Prigogine-Flory corresponding state theory. The effect of changes of solutionorientational order on C_p^E is also investigated. The intermolecular orientational order entropy parameter θ2S12 is introduced to the Flory model. The Flory model including θ2S12is improved for the estimation of _p^E values.The heat capacities C_p and excess heat capaciries C_p^E of four binarysystems cyclohexanone-benzene, cyclohexanone-toluene, cyclohexanone-elhylbenzene,cyclohexanone-isopropylbenzene are measured at 298.15K and under latm by the Calvet microcalorimeter.The error of mole fraction is ±0.0002, of C_p±0.0085, of C_p^E±0.055,arld of temperature ±0.01K. The C_p^E values of the four systems are always positive forwhole ranges of mole fractions. The excess heat capacities decrease with the increase ofnumber of carbon atoms of aromatic hydrocarbon. The experimental results are at variance with the Prigogine-Flory corresponding state theory. The effect of changes of solutionorientational order on C_p^E is also investigated. The intermolecular orientational order entropy parameter θ2S12 is introduced to the Flory model. The Flory model including θ2S12is improved for the estimation of _p^E values.

关 键 词：热容 过剩热 取向次序 熵参数 溶液 

分 类 号：O645.164[理学—物理化学] O624.4[理学—化学]