Multi-stage hydrocracking process for the hydroconversion of hydrocarbonaceous feedstocks

摘要

A process for the hydroconversion of a hydrocarbon feedstock. The process includes contacting the hydrocarbon feedstock with a catalyst in a first hydrocracking section to obtain a first hydrocarbon effluent stream which is separated into a gaseous stream, a light liquid stream and a heavy liquid stream. These liquid streams are fractioned into a number of fractions of hydrocarbons including a fraction of hydrocarbons having a boiling point above 350° C. This fraction of hydrocarbons is contacted with a catalyst in a second hydrocracking section to obtain a second hydrocarbon effluent stream that is separated to obtain a gaseous stream, a light liquid stream and a heavy liquid stream. These liquid streams are fractioned into a number of fractions of hydrocarbons including a heavy fraction of hydrocarbons having a boiling point above 350° C. This fraction of hydrocarbons is split into a major stream and a minor stream with the major stream being recycled and the minor stream is recovered.

主权项

1. A process for the hydroconversion of a hydrocarbonaceous feedstock comprising the steps of:
(a) contacting the hydrocarbonaceous feedstock at a first elevated temperature and a first pressure in a first hydrocracking section in the presence of hydrogen with a first hydrocracking catalyst to obtain a first hydrocarbon effluent stream; (b) separating at least part of the first hydrocarbon effluent within a first separating section into a first gaseous stream, a first light liquid stream of hydrocarbons boiling at or less than 350° C. and a first heavy liquid stream of hydrocarbons boiling above 350° C.; (c) separating the first light liquid stream and the first heavy liquid stream within a fractionating section having a bottom part operated at a temperature in the range of from 300-400° C. and a pressure in the range of from 0.05-10 bar and an upper part operated at a temperature in the range of from 0-100° C. and a pressure in the range of from 0.01-10 bar to yield a number of fractions of hydrocarbons including a heavy fraction of hydrocarbons that have a boiling point above 350° C.; (d) splitting at least part of the heavy fraction of hydrocarbons into at least two parts including a major stream and a minor stream, wherein the minor stream has a weight that is less than 5% wt, based on the weight of the hydrocarbonaceous feedstock; (e) contacting the major stream at a second elevated temperature and second pressure in a second hydrocracking section in the presence of hydrogen with a second hydrocracking catalyst to obtain a second hydrocarbon effluent stream; (f) separating at least part of the second hydrocarbon effluent stream within a second separating section into a second gaseous stream, a second light liquid stream and a second heavy liquid stream; (g) separating the second light liquid stream and the second heavy liquid stream within the fractionating section.