The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 13, 2022
Filed:
Aug. 31, 2020
Chevron U.s.a. Inc., San Ramon, CA (US);
Maggie A. Eaves, Mobile, AL (US);
Charles R. Davis, Jr., Moss Point, MS (US);
Greg A. Mullek, Mobile, AL (US);
Clay Duncan, Jr., Pascagoula, MS (US);
Jeff W. Johns, Draper, UT (US);
Chevron U.S.A. Inc., San Ramon, CA (US);
Abstract
A process for shutting down a hydroprocessing reactor and for removing catalyst from the reactor, wherein the reactor includes a quench gas distribution system. The process comprises shutting off hydrocarbon feed to the reactor, stripping hydrocarbons from the catalyst, and cooling the reactor to a first threshold reactor temperature in the range of from 375-425° F. (190-218° C.). At least a portion of circulating gaseous medium flowing to the reactor is then routed through a temporary heat exchanger and cooling the gas to not less than 40° F. (4° C.). Once cooled, mixing the cooled gas with the circulating gaseous medium flowing to the reactor. Continuing steps routing and cooling until a second threshold temperature is reached wherein the reactor temperature is in a range between 120° F. and 250° F. (49° C.-121° C.). The reactor can then be purged with Ngas, followed by introducing water into the reactor via the quench gas distribution system. The catalyst can then be safely removed from the reactor.