Abstract: A process for producing benzene is provided which comprises the steps of subjecting a charge rich in alkylaromatic hydrocarbons and containing 2-20% by weight paraffinic and/or naphthenic hydrocarbons, in a first catalytic zone, to a hydrotreatment in the presence of a catalyst mixture containing a selective mordenite catalyst and a reforming catalyst, then subjecting at least a portion of the resultant effluent to thermal or catalytic hydrodealkylation in a second zone, and separating and recovering benzene from the effluent from the second zone.

Abstract: A fresh charge containing aromatic hydrocarbons is hydrotreated in admixture with a recycle fraction, in the presence of a bifunctional catalyst, a portion of the effluent is subjected to steam-cracking, thereby recovering a gas oil fraction which is subjected to hydrogenation and forms said recycle fraction. The mixture of recycle fraction and charge is advantageously treated with hydrogen in the presence of a monofunctional catalyst to hydrogenate olefins, at a lower temperature than the hydrotreatment, and then passed to the hydrotreatment zone.

Abstract: A saturated hydrocarbon charge containing both butane and isobutane is subjected to selective hydrogenolysis in the presence of a catalyst comprising a specific carrier and 0.1 - 10 % b.w. of rhodium. Butane is thus selectively converted to ethane and propane, while isobutane is preserved or formed and can be recovered from the reaction product.

Abstract: The present process has for object the manufacture of olefinic hydrocarbons with respectively 2 and 3 carbon atoms per molecule. This object is attained by treating a charge selected from such cuts as light or heavy naphthas, kerosenes and light gas oils of distillation point lower than 360.degree. C. The cut is subjected to hydrogenolysis and the resulting C.sub.2 and C.sub.3 hydrocarbons are fed to a steam-cracking plant, while the C.sub.4.sup.+ hydrocarbons are subjected to further hydrogenolysis.

Abstract: This process for upgrading effluents from syntheses of the Fischer-Tropsch type comprises several steps applied to the three cuts obtained from these effluents, i.e. a "light fraction", a "light oil" and a "decanted oil". The products are mainly gasoline, kerosene and gasoil cuts.

Abstract: This process applies to effluents from syntheses of the Fischer-Tropsch type; it comprises several treatments applied to the three cuts obtained from these effluents, i.e. a "light fraction", a "light oil" and a "decanted oil". These treatments comprise such steps as distillation, polymerization, alkylation, hydrotreatment, cracking-decarboxylation, isomerization and hydro reforming. The products are mainly gasoline, kerosene and gasoil.

Abstract: Hydrocarbons are dehydrocyclized to aromatics over a new catalyst comprising a carrier such for example as alumina, platinum, at least one metal selected from iridium, tungsten and ruthenium, cobalt, at least one metal selected from the group consisting of copper, manganese, silver and gold, and at least one halogen such for example as chlorine.

Abstract: Process for producing aromatic hydrocarbons from gasolines substantially free of mono- and diolefins, comprising an aromizing step in the presence of a catalyst at a temperature from 400.degree. to 600.degree. C under a pressure from 1 to 30 kg/cm.sup.2 followed with the separation of an aromatic cut and of an alkylaromatic cut and a step of hydrodealkylating said alkylaromatic cut by means of hydrogen recovered from the aromizing step, in the presence of a catalyst, at a temperature from 400.degree. to 650.degree. C, under a pressure substantially equal or lower than that of the aromizing step.

Abstract: New catalyst comprising a carrier such for example as alumina, platinum, at least one metal selected from iridium, tungsten and ruthenium, cobalt, at least one metal selected from the group consisting of copper, manganese, silver and gold, and at least one halogen such for example as chlorine.

Abstract: New catalyst containing a carrier, platinum, iridium, manganese and optionally halogen. This catalyst is useful for reforming and dehydrogenation of hydrocarbons.

Abstract: Process for hydrodealkylating alkylaromatic hydrocarbons using a catalyst comprising at least two metals deposited on a carrier, a first of these two metals being selected either from the group consisting of cobalt, ruthenium, osmium, palladium, rhodium, iridium and platinum or from the group consisting of chromium, molybdenum, tungsten and manganese, and the second of these two metals being selected from zinc, cadmium, gallium, indium, thallium, manganese, copper, silver, gold, yttrium, titanium, niobium, tentalum, chromium, molybdenum, tungsten, rhenium, germanium, tin and lead.

Abstract: Process for hydrodealkylating an alkylaromatic hydrocarbon charge at a temperature from 400.degree. to 650.degree.C under a pressure from 1 to 30 kg/cm.sup.2 at a space velocity from 1 to 10 by reacting said charge with hydrogen in a molar proportion with respect to the effluent of the reactor in the range from 1 to 10, in the presence of a catalyst containing alumina and at least one metal selected from ruthenium, osmium, palladium, rhodium, iridium, platinum and manganese in an amount from 0.05 to 5 % of the catalyst, said catalyst having a specific surface from 1 to 100 m.sup.2 /g., a total pore volume of 0.2-0.8 g/cc and a heat of neutralization lower than 10 calories per gram are measured by ammonia adsorption at 320.degree. C. under 300 mm Hg.

Abstract: New catalyst containing a carrier, platinum, iridium, manganese and optionally halogen. This catalyst is useful for reforming and dehydrogenation of hydrocarbons.