Boreskov Institute of Catalysis of the Siberian Branch of Russian ...

PP-IV-191. Proportionally less isoparaffin hydrocarbons are formed from n-hexane present in thecycloparaffin containing feed.2. Octane numbers of the mixtures of cyclohexane and methyl cyclopentane are higherthan those of isoparaffin mixtures at the investigated reaction temperature.The yield of the mixture of iso- and cycloparaffins (ip+cp) obtained after separating n-paraffins with 100% efficiency was relatively high (60-75%). The cyclohexane isomerizes tomethyl cyclopentane having high octane number. The RON of the mixtures of iso- andcycloparaffins are nearly the same for all products RON ip+cp-feed ~40-52. Advantages of the lowtemperature processΔ(79.0-82.5) and are the followings:• energy-economical operation;• significant capacity increase can be reached due to the lower n-paraffin recirculation(applying the same amount of catalyst and LHSV), or in case of the same capacity theamount of catalyst is lower which results in cost saving;• more isoparaffin hydrocarbons (~4-6%) can be produced from a fraction of givenamount and composition (raw material saving);• hydrogen saving conversion, since the rate of hydrocracking reactions is lower as thecatalyst is active at medium temperature, thus less hydrogen isC m H 2m+2 + C n-m H 2(n-m)+2 →consumed. Hydrocracking: C n H 2n+2 + H 2• product mixture having at least 2-5 units higher octane number can be produced bysimple pass over.Desulphurization of the feedstock and removal of water is not an issue in the process,because the sulphur content of engine gasoline – thus that of the gasoline blendingcomponents, as well – has to be reduced below 50 (10) ppm in the European Union from 2005and it has to be practically water-free, too. Finally the obtained practically benzene-free(