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Benzene–ethanol association. The excess molar enthalpy and second virial cross-coefficients for (benzene + ethanol)(g) and (cyclohexane + ethanol)(g)

✍ Scribed by C.J. Wormald; C.J. Sowden

Publisher
Elsevier Science
Year
1997
Tongue
English
Weight
196 KB
Volume
29
Category
Article
ISSN
0021-9614

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✦ Synopsis

2 5 6 12

temperature range 363.2 K to 433.2 K are reported. These measurements supplement earlier measurements made over the range 453.5 K to 522.9 K at pressures up to 4.5 MPa. The non-ideality of the ethanol vapour is described using a quasi-chemical model in which only dimer and tetramer association equilibria are considered. The values of H E for m Ž . Ž . ethanol q cyclohexane g were found to agree well with values calculated using the Ž . Ž .

E association model. For ethanol q benzene g the experimental values of H were found to m be approximately 20 per cent smaller than values calculated from the model and this was attributed to weak association between the unlike molecules. A quasi-chemical model used to describe the association between the unlike molecules yielded a value of the equilibrium Ž . y 1 constant K 298.15 K s 0.28 MPa , and a value for the enthalpy of the ethanol᎐benzine 12 . y1 association of ⌬ H s y14 kJ mol . Second virial cross-coefficients B for ethanol᎐ 12 12 cyclohexane and ethanol᎐benzene have been derived from the H E measurements. ᮊ 1997 m Academic Press Limited

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