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Issue 12, 1999
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Behaviour of binary mixtures of an alkyl methanoate+an n-alkane. New experimental values and an interpretation using the UNIFAC model

Abstract

This paper presents an interpretation on the behaviour of mixtures containing alkyl methanoates with n-alkanes from a structural point of view. New experimental data of molar excess properties, hE and vE, are measured at 298.15 K and 101.32 kPa for this work to complete the existing information. Mixtures corresponding to methyl methanoate+n-alkanes showed excess quantities higher than expected because of the self-association of methyl methanoates, which decreases as the chain length/molar mass of alkyl methanoates increases. The consideration of autoassociation in methanoates, presented in this paper as an empirical relationship for its characterization as a function of number of carbon atoms of alkyl methanoate, was included as a specific term in the UNIFAC model that gave excellent results in the predictions of HE, with mean differences smaller than 2%. In the Nitta model the association in methanoates was considered employing different forms of molecular interactions but the results were not so good.

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Article information


Phys. Chem. Chem. Phys., 1999,1, 2967-2974
Article type
Paper

Behaviour of binary mixtures of an alkyl methanoate+an n-alkane. New experimental values and an interpretation using the UNIFAC model

J. Ortega, J. Plácido, F. Toledo, M. Vidal, E. Siimer and J. L. Legido, Phys. Chem. Chem. Phys., 1999, 1, 2967
DOI: 10.1039/A901452G

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