INVESTIGATION OF THE HYDROGENATION OF SOME SUBSTITUTED ALKYLBENZENES IN A LABORATORY-SCALE TRICKLE-BED REACTOR

Citation
Tk. Rantakyla et al., INVESTIGATION OF THE HYDROGENATION OF SOME SUBSTITUTED ALKYLBENZENES IN A LABORATORY-SCALE TRICKLE-BED REACTOR, Journal of chemical technology and biotechnology, 67(3), 1996, pp. 265-275
Citations number
8
Categorie Soggetti
Engineering, Chemical",Chemistry,"Biothechnology & Applied Migrobiology
ISSN journal
02682575
Volume
67
Issue
3
Year of publication
1996
Pages
265 - 275
Database
ISI
SICI code
0268-2575(1996)67:3<265:IOTHOS>2.0.ZU;2-D
Abstract
The liquid-phase hydrogenation kinetics of toluene, cumene and mesityl ene was studied over an alumina-supported nickel catalyst in a laborat ory scale trickle-bed reactor operating isothermally at temperature of 75-115 degrees C and at hydrogen pressures of 20-40 bar. The experime nts performed in the absence of intraparticular diffusion resistance s howed that the catalyst deactivated rapidly at the initial stage of th e experiment, after which a virtually stable level of the catalyst act ivity was attained. The systematic kinetic experiments carried out wit h a stable aged catalyst revealed that cumene and mesitylene at high c oncentrations retarded the hydrogenation rate, whereas such an effect was not observable for toluene. The results of the kinetic experiments were interpreted quantitatively with a reaction mechanism involving s equential addition of hydrogen to absorbed aromatic molecules.