Hydrocracking process with feed/bottoms treatment

摘要

A hydrocracking process for treating a first and a second heavy hydrocarbon feedstream, in which the first heavy hydrocarbon feedstream contains undesired nitrogen-containing compounds, sulfur-containing compounds and poly-nuclear aromatic compounds. The process includes contacting the first heavy hydrocarbon feedstream with adsorbent material to produce a hydrocarbon stream having a reduced content of nitrogen-containing, sulfur-containing compounds and poly-nuclear aromatic compounds. The second heavy hydrocarbon feedstream is combined with the adsorbent-treated heavy hydrocarbon stream. The combined stream is charged to a hydrocracking reaction unit. The hydrocracked effluent is fractioned to recover hydrocracked products and a bottoms stream containing heavy poly-nuclear aromatic compounds, and bottoms are contacted with adsorbent material to produce an adsorbent-treated fractionator bottoms stream having a reduced content of heavy poly-nuclear aromatic compounds, and are recycled to the hydrocracking reaction unit.

主权项

1. A hydrocracking process for treating a first heavy hydrocarbon feedstream and a second heavy hydrocarbon feedstream, the first heavy hydrocarbon feedstream contains undesired nitrogen-containing compounds and poly-nuclear aromatic compounds, the process comprising:
a. contacting the first heavy hydrocarbon feedstream with an effective amount of adsorbent material to produce an adsorbent-treated heavy hydrocarbon stream having a reduced content of nitrogen-containing and poly-nuclear aromatic compounds; b. combining the second heavy hydrocarbon feedstream with the adsorbent-treated heavy hydrocarbon stream; c. introducing the combined stream and an effective amount of hydrogen into a hydrocracking reaction unit that contains an effective amount of hydrocracking catalyst to produce a hydrocracked effluent stream; d. fractionating the remainder of the hydrocracked effluent stream to recover hydrocracked products and a bottoms stream containing heavy poly-nuclear aromatic compounds; e. mixing the fractionator bottoms stream with solvent; f. contacting the mixture of fractionator bottoms stream and solvent with an effective amount of adsorbent material to produce an adsorbent-treated fractionator bottoms stream having a reduced content of heavy poly-nuclear aromatic compounds; g. integrating the adsorbent-treated fractionator bottoms stream with the combined stream of steps (b); and h. introducing the combined stream into the hydrocracking reaction unit.