Procedure to convert heavy refinery hydrocarbons into petrochemical products

摘要

A process for converting heavy refinery hydrocarbons into petrochemical products, which comprises the following steps of: (a) feeding a hydrocarbon feedstock to a ring opening reaction area, where the process conditions prevailing in said reaction area for opening rings are a temperature of 100 ° C and 500 ° C, and a pressure of 2 to 10 MPa together with between 50 and 300 kg of hydrogen per 1,000 kg of raw material in an aromatic hydrogenation catalyst, and passing the current resulting to a ring cleavage unit at a temperature of 200 ° C to 600 ° C and a pressure of 1 to 12 MPa together with between 50 and 200 kg of hydrogen per 1000 kg of said resulting stream in a ring cleavage catalyst ; (b) feeding the effluent from (a) to a separation unit to produce a gaseous stream comprising light boiling hydrocarbons, a liquid stream comprising hydrocarbons in the boiling range of naphtha and a liquid stream comprising hydrocarbons in the boiling range of diesel; (c) feeding said liquid stream comprising hydrocarbons in the boiling range of naphtha to a hydrocracking unit, wherein the process conditions prevailing in said hydrocracking unit are a reaction temperature of 300-580 ° C, a pressure of 0.3-5 MPa gauge and an hourly space velocity by weight (WHSV) of 0.1-10 h-1; (d) separating the reaction products of said hydrocracking unit from step (c) in a higher gas stream, comprising light boiling hydrocarbons, and a BTX (a mixture of benzene, toluene and xylenes) comprising a stream bottom, (e) feed the upper gas stream of the hydrocracking unit of stage (d) and the gaseous stream of the stage separation unit (b) to a steam cracking unit and at least one or more units selected from the group of propane dehydrogenation unit, butane dehydrogenation unit and combined propane and butane dehydrogenation unit, preferably after separating a hydrogen-containing stream from said gaseous streams.