Process for Preparation of Hydrocracking Catalyst for Use in Hydrocracking of Hydrocarbon Streams (Sabic)

Process for Preparation of Hydrocracking Catalyst for Use in Hydrocracking of Hydrocarbon Streams (Sabic)
United States Patent Application 20160264884
Narayanaswamy; Ravichander ;   et al.   September 15, 2016
Applicant: Sabic Global Technologies
Abstract
A process for activating and maintaining a catalyst for use in hydrocracking a hydrocarbon stream includes continuously contacting a hydrocarbon stream with a hydroprocessing catalyst in the presence of hydrogen. Sulphides and chloride compounds in the hydrocarbon stream are used such that the hydroprocessing catalyst has the ability to hydrogenate, dechlorinate, and hydrocrack components of the hydrocarbon stream.
TECHNICAL FIELD
[0002] The present disclosure relates to the preparation of hydrocracking catalysts for the treatment of hydrocarbon streams resulting from pyrolysis of waste plastics for use in downstream processes.
BACKGROUND
[0003] Waste plastics contain polyvinylchloride (PVC). Through a pyrolysis process, waste plastics can be converted to gas and liquid products. These liquid products contain paraffins, i-paraffins (iso-paraffins), olefins, naphthenes, and aromatic components along with organic chlorides in concentrations of hundreds of ppm. However, the liquid products of a pyrolysis process (pyrolysis oils) are off-spec for use as a feedstock for steam crackers because steam cracker feed specifications require chloride levels less than 3 ppm, olefin content less than 1 wt %, and boiling end point requirements of 370.degree. C.
SUMMARY
[0004] Disclosed herein is a process for activating and maintaining a catalyst for use in hydrotreating a hydrocarbon stream to simultaneously reduce heavier boiling components, chlorides, and olefins, comprising continuously contacting the hydrocarbon stream with a hydroprocessing catalyst in the presence of hydrogen, wherein the hydrocarbon stream comprises one or more chloride compounds and one or more sulphides.
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