ISSN:
1572-8927
Keywords:
Excess functions
;
excess enthalpy
;
excess volume
;
Flory interaction parameter
;
Prigogine-Flory theory
;
liquid mixtures
;
isothermal compressibility
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract Isothermal compressibilitiesκ T for benzene + n-alkane systems at 25, 35, 45, and 60°C have been used to check the Prigogine-Flory theory using the van der Waals and Lennard-Jones potentials in order to study the energy-volume dependence. The Flory interaction parameter χ12 has also been calculated for those set of systems at four temperatures. The variation of χ12 with the number of carbon atoms in the n-alkane was studied. Three excess functions have been obtained from χ12 for the equimolecular mixture: (∂V E/∂p)T which is related toκ T E , the excess enthalpy H E , and the excess volume V E . Except for H E theoretical predictions using a Lennard-Jones potential are in good agreement with the experimental data. A similar treatment has been performed for the same set of systems but using H E data at 25°C. The theory, using a van der Waals potential, predicts correctly the variation of the three excess functions with the chain length of the n-alkane but using a Lennard-Jones potential results in better agreement for the order in the magnitude of these excess functions.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00647382
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