The esterification process of ethenyl benzene and its derivative compounds @-methyl, p-methoxy, p-chloro, m-methyl, m-nitro and m-chloro, respectively) was carried out with acetic acid and using perchloric acid as a catalyst. From the effects of the variables studied it could be concluded that: the temperature and the catalyst concentration influence positively over the olefin conversion, whereas the initial olefin concentration exert no effect over the same; and that the presence of perchloric salts exerts a different influence, depending on the temperature and on the catalyst concentration. It has been proven that the substituted radicals in the morp-positions exert an important influence over the conversion of the studied olefins. presenting growing reactivity in the following order: m-nitro ethenyl benzene, m-chloro ethenyl benzene, p-chloro ethenyl benzene, m-methyl ethenyl benzene, ethenyl benzene, p-methyl ethenyl benzene andp-methoxy ethenyl benzene. Finally, a kinetic and thermodynamic study has been done and the corresponding parameters have been calculated, with an adequate fitting.
Le procede d'esterification d'ethenylbenzene et de ses composes derives (p-methyl, p-chloro, m-methyl, m-nitro et m-chloro, respectivement) a ete realist avec de I'acide acetique et en utilisant de I'acide perchlorique comme catalyseur. A partir des effets des variables etudiees, on a pu conclure que la temperature et la concentration de catalyseur avaient une influence positive sur la conversion des olefines, tandis que la concentration initiale d'olefines n'a pas d'effet sur cette conversion; de m&me, il a ete conch que la presence de sels perchloriques exerce une influence variable selon la temperature et la concentration de catalyseur. I1 est demontre que les radicaux substitues dans les positions m-ou p-influent fortement la conversion des olefines etudies, laquelle presente une reactivite croissante dans I'ordre suivant : m-nitro ethenylbenzene, m-chloro ethenylbenzene, p-chloro Cthenylbenzene, m-methyl ethenylbenzene, ethenylbenzene, p-methyl ethenylbenzene etp-methoxy ethenylbenzene. Enfin, on a mene une etude cinetique et thermodynamique et les parametres correspondants ont ete calcules, avec un calage adequat.