Hydrocracking operation with reduced accumulation of heavy polynuclear aromatics
AssigneeChevron U.S.A. Inc.
InventorsLing JIAO, Bi-Zeng ZHAN, Don BUSHEE, Theodorus Ludovicus Michael MAESEN, Hye-Kyung TIMKEN, Richard DUTTA, Jay PAREKH
Life of this patent
Estimating the term…
Abstract
Provided is a hydrocracking process with a recycle loop for converting a petroleum feed to lower boiling products, which process comprises reacting a stream over a non-zeolite noble metal catalyst at a temperature of about 650° F. (343° C.) or less in a reactor positioned in the recycle loop of the hydrocracking reactor.
Claims12
A two-stage hydrocracking process with a second stage reactor recycle loop for converting a petroleum feed to lower boiling products, which process comprises:
- (i) hydrotreating a petroleum feed in the presence of hydrogen to produce a hydrotreated effluent stream comprising a liquid product in a first reactor;
- (ii) passing at least a portion of the hydrotreated effluent stream to a separation section;
- (iii) passing at least a portion of a bottoms fraction of the separation section comprising a heavy polymuclear aromatic including coronene to a reactor comprising a non-zeolite Pt—Pd noble metal catalyst, which reactor is run at a temperature between 400° F. (204° C.) and 500° F. (260° C.) to produce a product free of coronene, which is completely converted;
- (iv) passing the entirety of the product from the reactor comprising the non-zeolite noble metal catalyst directly, without separation, to a second stage hydrocracking reactor to produce a hydrocracked effluent stream;
- and
- (v) recycling the hydrocracked effluent stream back to the hydrotreated effluent stream of (i).
A two-stage hydrocracking process with a second stage reactor recycle loop for converting a petroleum feed to lower boiling products, which process comprises:
- (i) hydrotreating petroleum feed in a first stage reactor in the presence of hydrogen to produce a hydrotreated effluent stream comprising a liquid product;
- (ii) passing at least a portion of the hydrotreated effluent stream to a separation section;
- (iii) passing at least a portion of a bottoms fraction of the separation section comprising a heavy polynuclear aromatic including coronene to a second stage hydrocracking reactor to produce a hydrocracked effluent stream;
- (iv) recycling the hydrocracked effluent stream comprising passing the hydrocracked effluent stream directly, without separation, through a reactor comprising a non-zeolite Pt—Pd noble metal catalyst, which is run at a temperature between 400° F. (204° C.) and 500° F. (260° C.) to produce a product free of coronene which is completely converted.
Dependencies are inferred from the claim text.