Lucia Odochian, Camelia Soldea, Cristina Paius, Anca Mihaela Mocanu, Costel Moldoveanu<br>Kinetic Study on Competitive Alkylation of an Arene Mixture <br>Coming from the Petrochemical Industry

Lucia Odochian, Camelia Soldea, Cristina Paius, Anca Mihaela Mocanu, Costel Moldoveanu
Kinetic Study on Competitive Alkylation of an Arene Mixture
Coming from the Petrochemical Industry

Abstract:

In the present paper the kinetics of the competitive Friedel-Crafts alkylation of a mixture of xylene isomers and ethylbenzene with t-buthyl chloride and anhydrous AlCl3 as a catalyst were studied by using a petrochemical by-product(Petrochemical Company of Brazi), under the optimum conditions of obtaining the alkylated products under consideration. The concentrations of the rection major components were estimated by gas-chromatography. The kinetic parameters of the competitive alkylation were estimated and the following reactivity series of the mixture components settled: ko-xylene ] k ethylbenzene ] km-xylene although the calculated corresponding activation energies obeyed the following order: Ea m-xylene [ Ea o-xylene [ Ea ethylbenzene The reactivity was made evident to be strongly influenced by the steric factor (p) of the alkylation reactions which was calculated and the following series found: pm-xylene [ po-xylene [ pethylbenzene Since the reaction thus performed resulted in alkylated m-xylene as the major reaction product which could be separated by distillation in a high purity state, the fact has to be pointed out that the present study brings an important contribution both to the high capitalization of the petrochemical by-product and to the obtaining of 5-t-buthyl-m-xylene of high quality as a key intermediate in nitro musk syntheses. Keywords: xylenes, Friedel-Crafts alkylation, optimum conditions, kinetical parameters, by-product capitalization

Issue: 2010, Volume 61, Issue 3

Pages:

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