Patent ID: 7156977
Filing Date: 2007-01-02
Classification: C10G

Abstract:
1. A process for hydroprocessing a hydrocarbon feed comprising the steps of (a) admixing the feed with a hydrogen rich gas and obtaining a first admixed process stream; (b) contacting the first admixed process stream with a first catalyst being active in hydrocracking of hydrocarbon compounds and obtaining a first catalyst effluent process stream; (c) separating the first catalyst effluent process stream in a gas phase stream and a liquid phase stream, and withdrawing the gas phase stream; (d) admixing the liquid phase stream with a hydrogen rich gas and obtaining a second admixed process stream; (e) contacting the second admixed process stream with a second catalyst being active in hydrocracking of hydrocarbon compounds and obtaining a second catalyst effluent process stream; (f) withdrawing and admixing the second catalyst effluent process stream with the gas phase stream obtained in step (c); and (g) withdrawing the admixed process stream provided in step (f), wherein ammonia is added after step (c) and prior to step (e); further comprising the steps of, in the one or more hydroprocessing reactors prior to step (a): installing a flanged spool piece between an existing man hole flange at top of the reactor; retrofitting existing mixer plates to partition plates; installing risers extending from top of reactor to upper surface of the partition plate between the catalyst beds and installing downcomers extending from top of the reactor to lower surface of the partition plate; and providing ducts connecting nozzles on the spool piece with the risers and the downcomers.