GB551663A - Process for making an improved gasoline - Google Patents

Abstract

551.663. Cracking hydrocarbons. INTERNATIONAL CATALYTIC OIL PROCESSES CORPORATION. Aug. 28, 1941, No. 9949. Convention date, Aug. 2. 1940. [Class 32] [Also in Group IV] Gasoline of improved octane number and stability is obtained by cracking a gas oil in presence of a catalyst which has already been used in the catalytic treatment of hydrocarbons, fractionating the cracked products to separate hydrogen, gaseous hydrocarbons and gasoline, and reforming the gasoline with or without the gases by passage over fresh or regenerated catalyst. The reforming operation effects the polymerization and alkylization of olefines, the isomerization of paraffins and the stabilization of unsaturates in the cracked product. Preferably the catalyst which has been used in the reforming is used without regeneration in the cracking stage. East Texas reduced crude vaporized in coil 3, heated to 825-850‹F. and separated from heavy fractions in flash evaporator 8, is formed into a suspension in an injector 12 with catalyst suspended in gases fed through line 128. The suspension is heated to cracking temperature in a coil or cylindrical reactor 28 and the cracked products pass to a cyclone separator 32 where catalyst is separated and falls down a baffled tower 33 to a hopper 39. The vapours pass through a cooler 46 to condense gas oil and thence to separator 50 where gas oil is removed through line 51 and optionally gases through line 55. The gasoline fraction is taken off through line 64 and formed into a suspension with regenerated catalyst supplied from hopper 63 to injector 57. The suspension is passed through line 68 to a coil or cylindrical reactor 70 heated to 650-850‹F. where the cracked vapours are reformed, the products passing to separator 74 where catalyst is separated and falls through a tower 75 to conveyer 80 and chamber 125 where it is again suspended in gas admitted through line 126 and fed through lines 128, to provide the catalyst for the cracking stage. The catalyst used in the cracking stage is fed from the hopper 39 to a chamber 103 where it is suspended is oxidizing gases admitted through line 104 and then fed through the coiled or cylindrical regeneration chamber 106 the regenerated catalyst being separated from gases in tower 59 and then fed through chamber 63 to injector 57 as catalyst for the reforming stage. Apparatus is described in which stationary catalyst is used in fixed beds in reactors instead of in suspension