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Thermodynamic properties of (a butyl ester  +  ann-alkane). XIII.HmEandVmEfor {xCH3(CH2)u − 1CO2(CH2)3CH3 + (1  − x)CH3(CH2)2 v + 1CH3}, whereu =  1 to 3 andv =  1 to 7

✍ Scribed by F.J. Toledo-Marante; ; J. Ortega; ; M. Chaar; ; M. Vidal

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
531 KB
Volume
32
Category
Article
ISSN
0021-9614

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✦ Synopsis

In the framework of a series of studies carried out by our research team, the excess molar enthalpies H E m and excess molar volumes V E m for 21 binary mixtures composed of one of three butyl esters (ethanoate, propanoate, and butanoate) and one of seven odd n-alkanes (pentane to heptadecane) were determined experimentally at T = 298.15 K. Experimentation showed the mixing processes for these systems to be endothermic, with the H E m values varying quasi-linearly with n-alkane chain length; there is also a regular variation in the V E m values, though the mixtures of the three butyl esters with pentane presented contraction effects with values of V E m that were more negative than expected. The most probable molecular interactions taking place in (ester + n-alkane) systems are discussed. Comparison of the experimental results with certain theoretical groupcontribution models showed that differences in the estimates increased with increasing molar mass of the mixture components, indicating a need to improve modeling by adapting the models so that they more closely reflect the special circumstances that affect the behaviour of the mixtures in question.

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