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Measurements of the Heat Capacity of an Azeotropic Mixture of Water and n-Butanol from 78 to 320 K by Zhao-Dong Nan; Zhi-Cheng TAN; Jun Xing is a Chemistry article available to read on EtoBox.

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## Abstract Molar heat capacities of __n__‐butanol and the azeotropic mixture in the binary system [water (x=0.716) plus __n__‐butanol (x=0.284)] were measured with an adiabatic calorimeter in a temperature range from 78 to 320 K. The functions of the heat capacity with respect to thermodynamic temperature were established for the azeotropic mixture. A glass transition was observed at (111.9±1.2) K. The phase transitions took place at (179.26±0.77) and (269.69±0.14) K corresponding to the solid‐liquid phase transitions of __n__‐butanol and water, respectively. The phase‐transition enthalpy and entropy of water were calculated. A thermodynamic function of excess molar heat capacity with respect to temperature was established, which took account of physical mixing, destructions of self‐association and cross‐association for __n__‐butanol and water, respectively. The thermodynamic functions and the excess thermodynamic ones of the binary systems relative to 298.15 K were derived based on the relationships of the thermodynamic functions and the function of the measured heat capacity and the calculated excess heat capacity with respect to temperature.

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Author

Zhao-Dong Nan; Zhi-Cheng TAN; Jun Xing

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); Wiley-Blackwell; Science Press; Wiley (ISSN 0256-7660)

Published

2005

Language

EN

Field

Chemistry (Physical Sciences)