GB1293272A - Method for the conversion of hydrocarbons - Google Patents

Abstract

1293272 Hydrotreating oils UNIVERSAL OIL PRODUCTS CO 12 Jan 1970 1375/70 Heading C5E A hydrocarbon oil feed 1 is catalytically reacted with hydrogen at 8 and a quench stream 35 is introduced into the reaction effluent in an amount responsive to the measured temperature of the vapour stream 12 so as to maintain the stream 12 at a predetermined temperature. The quenched effluent 9 is separated at 10 into a first liquid stream 11 and a first vapour stream 12 which is cooled to 50-150‹ F. and separated at 15 into a second vapour stream 16 comprising hydrogen and which is recycled to the reaction and a second liquid stream 18. At least a portion 4 of the second vapour stream is heated by indirect heat exchange at 38 with a portion 35 of the first liquid stream before being recycled to the reactor and the stream 35, after being cooled at 38, is used as the quench stream. A stream of water 3 can be included in the feed to the reactor and a portion 7 of the first liquid stream 11 can be recycled to the reactor via lines 7 and/or 40. The reaction is carried out at a feed inlet temperature of 700-800‹ F. and a pressure of 1000-3500 p.s.i.g. using a catalyst comprising a Group VIa and/or a Group VIII metal on an oxidic support, e.g. a composite of 2 wt. per cent nickel and 16% molybdenum on a carrier comprising 68% alumina, 22% boron trifluoride and 10% silica to remove S and N and to convert a portion of the feed into lower boiling products. Suitable feeds are heavy residual petroleum, coal tar, tar sand or shale oils having initial boiling points above 400‹ F. and end boiling points above 1100‹ F. The quench stream 35 is suitably cooled to 200- 450‹ F. so that the stream 9 is cooled from 900‹ to 700-800‹ F. prior to entering the hot separator 10. The remainder of the first liquid stream 11 enters the hot flash zone 24 at a pressure of 100-500 p.s.i.g. and is separated into a third liquid stream 27 and a third vapour stream 25 which is cooled at 26. The second liquid stream 18 is washed with water to remove ammonia, combined with the vapour stream 25 and separated at 20 into a stream 21, consisting mainly of propane and lighter gases, and a fourth liquid stream 22 of which a portion 23 can be recycled to the cold separator 15. The remainder of stream 22 can be combined with the liquid stream 27 and fractionated at 30 to provide a gasoline stream 31, a middle distillate 32 and a main stream 33 of fuel oil with less than 1% sulphur.