Experimental values and analysis of mixing heats of the binary mixtures formed by alkyl benzoates and n-alkanes

H E values for 28 binary mixtures of four alkyl (methyl, ethyl, propyl, and butyl) benzoates and seven odd n-alkanes (from pentane to heptadecane) were determined experimentally at 298.15 K. Data plots ( x, H E) revealed the endothermicity of the mixtures. For a given ester the endothermic effects i...

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Bibliographic Details
Published in:Fluid phase equilibria 1995-07, Vol.108 (1), p.121-133
Main Authors: Ortega, Juan, Postigo, Miguel A.
Format: Article
Language:English
Subjects:
Alkanes
Benzoates
Chemical thermodynamics
Chemistry
Data
Exact sciences and technology
Excess enthalpies
Experiments
General and physical chemistry
Mixtures
Thermodynamic properties
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Summary:H E values for 28 binary mixtures of four alkyl (methyl, ethyl, propyl, and butyl) benzoates and seven odd n-alkanes (from pentane to heptadecane) were determined experimentally at 298.15 K. Data plots ( x, H E) revealed the endothermicity of the mixtures. For a given ester the endothermic effects increased regularly with n-alkane chain length and decreased regularly with the length of the alkylated chain of benzoate. The experimental values were analysed using two versions of the UNIFAC group contribution model. Using the new data, values were calculated for the specific interactions of the characteristic carboxyl group, COO, on the benzoates with other groups in the mixing process for these mixtures, namely, CH 2 COO and ACH COO . Using the new values the model produced good H E estimates, with an overall mean error of less than 5%.
ISSN:0378-3812
1879-0224
DOI:10.1016/0378-3812(95)02704-I