HYDROGEN-CONSUMING PROCESS FOR CONVERSION OF A HYDROCARBON CHARGE STOCK INTO LOWER-BOILING HYDROCARBON PRODUCTS

摘要

1357188 Hydrocracking UNIVERSAL OIL PRODUCTS CO 23 Aug 1971 [24 Aug 1970] 39356/71 Heading C5E A hydrocarbon charge stock is converted into lower-boiling hydrocarbons in the presence of hydrogen in two catalytic reaction systems arranged in parallel. Each system contains from 30 to 70% of the catalyst and receives from 30 to 70% of the charge; the effluent from each is separated into gaseous and liquid phases without reduction of pressure and at a temperature of 316‹ to 427‹C.; the gaseous phase from the first reaction system provides the hydrogen for the second, and at least part of the gaseous phase from the second system provides hydrogen for the first. As shown, charge stock is heated at 2 and divided into two streams in lines 3 and 4. The stream in line 3 joins a stream of hydrogen in line 5, that has been preheated at 20, and passed over catalyst in reactors 6 and 8, and to a hot separator 10. The liquid phase from this separator is fractionated at 24, and the gas phase passes by line 11 to join the feed stream in line 4. This passes over catalyst in reactors 12 and 14 to a hot separator 16. The gas phase from this separator is cooled and again separated at 18 ; the gas phase from the cold separator passes by line 19 to the heater 20. The liquid phases from all three separators are mixed and fractionated at 24. A portion of the bottoms fraction may be recycled by lines 31 and 32 as a quench for the two streams at points between reactors 6 and 8 or 12 and 14 respectively. Makeup hydrogen is introduced at 21. The catalyst may comprise a metal of the V, Mo, or Ni groups on a porous carrier, e.g. alumina, titania, zirconia, magnesia, thoria, boria, silica-alumina, silica-magnesia, chromia-alumina, alumina-silica-boron phosphate, silica-zirconia or a zeolite. It may be used in a fixed bed, a moving bed, a fluidized bed or a batch operation, but a fixed bed is preferred, with upward, downward or radial flow. The conversion process may be a hydrocracking, aromatic hydrogenation, ring-opening, hydrofining to remove nitrogen or sulphur or to saturate olefines, improvement of kerosene fractions for jet fuel or hydrogenation.