SOC FRANCAISE DES PROD POUR CATALYSE HYDROCARBON CONVERSION CATALYSTS THEIR PREPARATION AND US

摘要

1502625 Aromatization SOC FRANCAISE DES PRODUITS POUR CATALYSE 8 Oct 1975 [11 Oct 1974] 41261/75 Heading C5E [Also in Division B1] Hydrocarbon feeds are converted using a catalyst comprising (i) a carrier; (ii) platinum; (iii) at least one metal selected from iridium, rhodium and ruthenium; (iv) coba (v) at least one metal selected from copper, manganese, silver or gold; and, (vi) 0À1-10% wt. (based on the carrier) of a halogen in combined form. The catalyst is particularly suited to the production of aromatic hydrocarbons, e.g. benzene, toluene or xylenes, from gasolines, e.g. steam cracked or reformed gasolines from naphthenic hydrocarbons by dehydrogenation; or from paraffins by dehydrocyclization. For example, an unsaturated charge containing diolefins and mono-olefins may be firstly treated to a hydrogenation step to convert diolefins to monolefins and alkenylaromatics to alkyl aromatics; then the charge may be treated in a hydrogenationhydrodesulphurization step to convert monolefins to paraffins and free the charge from sulphur; and finally, the charge may be treated in the presence of hydrogen with the present catalyst to form aromatics, e.g. at 300-600‹ C., a pressure of 1-60 kg./cm.SP2/SP and a LHSV of 0À1-10. This step may be effected in a plurality of stages, for example a first stage at 400-600‹ C. using a catalyst wherein the catalyst is neutral and of a specific surface lower than 100 m.SP2/SP/g. and a second stage wherein the catalyst has a relatively high surface area and is acidic. The catalyst may be in fixed bed, moving bed or fluidized form. The examples describe treatment of a feed containing pentanes, hexanes, heptanes, cyclopentane, methylcyclopentane, cyclohexane, C 7 and C 8 naphthenes and some benzene and toluene to give a product of increased benzene and toluene content.