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Citation: Sun Hong-Wei, Gao Ming-Shu, Ma Pei-Sheng. Measurement and Investigation of Heat Capacity and Excess Heat Capacity of Binary Liquid Mixture[J]. Acta Physico-Chimica Sinica, ;1996, 12(06): 537-542. doi: 10.3866/PKU.WHXB19960612 shu

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

1.
Beijing University of Chemical Technology Department of Chemical Engineering,Beijing 100029

Received Date: 8 September 1995
Available Online: 15 June 1996

The heat capacities C_p and excess heat capaciries C_pE of four binary systems 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_pE±0.055, and of temperature ±0.01K. The C_pE values of the four systems are always positive for whole ranges of mole fractions. The excess heat capacities decrease with the increase of number of carbon atoms of aromatic hydrocarbon. The experimental results are at variance with the Pri gine-Flory corresponding state theory. The effect of changes of solution orientational order on C_pE 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 C_pE values.
- Heat capacity,
- Excess heat capacity,
- Pri gine-Flory corresponding state theory,
- Orientational order,
- Entropy parameter
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