Hydrocarbon upgrading process
AssigneeExxonMobil Research and Engineering Company
InventorDennis E. Walsh
Life of this patent
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Abstract
Low sulfur gasoline of relatively high octane number is produced from a catalytically or thermally cracked, olefin-rich, sulfur-containing hydrocarbon stream by hydrodesulfurization followed by treatment over an acidic catalyst containing a molecular sieve belonging to the MCM-22 family in combination with a metal component, preferably selected from the transition elements of the 4th and 5th periods of the Periodic Table. The treatment over the acidic catalyst in the second step restores the octane loss which takes place as a result of the hydrogenative treatment and results in a low sulfur gasoline product with an octane number comparable to that of the hydrocarbon feed.
Claims12
A process for upgrading a hydrocarbon stream from a catalytic or thermal cracking process comprising:
- contacting an olefin-rich, sulfur-containing cracked hydrocarbon product stream with a catalytically effective amount of a hydrodesulfurization catalyst in a first reaction zone under catalytic hydrodesulfurization conditions in the presence of hydrogen, to produce an intermediate product comprising a liquid fraction which has a reduced sulfur content and a reduced octane number as compared to said cracked hydrocarbon product stream;
- and
- contacting at least a gasoline boiling range portion of said intermediate product in a second reaction zone with a catalytically effective amount of an acidic catalyst comprising at least one molecular sieve belonging to the MCM-22 family in combination with a metal component under catalytic conversion conditions which convert and substantially saturate the olefins contained in, and formed during processing of, the gasoline boiling range portion of the intermediate product to provide a product comprising a fraction boiling in the gasoline boiling range having an octane number that is substantially the same as or higher than the octane number of the gasoline boiling range fraction of the intermediate product.
Dependencies are inferred from the claim text.