Claims
- 1. A hydrocracking process for converting a heavy hydrocarbon feed to a lighter fraction having a 300° F. end point, the process comprising:feeding a heavy hydrocarbon feed and hydrogen in a fixed catalyst bed comprising a hydrocracking catalyst comprising a large pore zeolite catalyst loaded with a metal selected from the group consisting of noble metals and transition metals, said heavy hydrocarbon feed having a boiling point range from about 200° F. to about 900° F. and comprising at least 13 percent by weight hydrogen, less than 2 percent by weight heteroatoms, and less than 40 percent by weight aromatics; hydrocracking said heavy hydrocarbon feed at a hydrogen partial pressure of from about 300 to about 540 psig to convert the heavy hydrocarbon feed to a lighter fraction having a boiling end point of less than about 300° F. and a heavy fraction; separating said lighter fraction from said heavy fraction; recovering said lighter fraction as product; and recycling said heavy fraction to said fixed catalyst bed to substantially convert all of said heavy fraction to a lighter fraction having a boiling end point of less than about 300° F.; wherein said hydrocracking catalyst stabilizes to an aging rate of less than about 0.6° F. per day after 30 days on stream.
- 2. The hydrocracking process of claim 1, wherein said heavy hydrocarbon feed is selected from the group consisting of naphtha, kerosene, and diesel fractions.
- 3. The hydrocracking process of claim 1, wherein said catalyst bed further comprises a hydrotreating catalyst.
- 4. The hydrocracking process of claim 1, wherein the large pore zeolite is selected from the group consisting of zeolites X, Y, USY, beta, REX, REY, mordenite, ZSM-4, ZSM-20, ZSM-12, ZSM-38 and ZSM-50.
- 5. The hydrocracking process of claim 1, wherein the large pore zeolite is selected from the group consisting of X, Y, USY, and beta zeolites.
- 6. The hydrocracking process of claim 1, wherein the catalyst bed further comprises a base metal.
- 7. The hydrocracking process of claim 1, wherein the hydrocracking catalyst stabilizes to an aging rate of less than about 0.1° F. per day after 30 days on stream.
- 8. The hydrocracking process of claim 1, wherein the large pore zeolite has a constraint index of less than about 2.
- 9. The hydrocracking process of claim 1, wherein the large pore zeolite has a constraint index of less than about 2 and at least one noble metal or transition metal in combination with Mo, W or combinations thereof.
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a continuation-in-part of application Ser. No. 08/964,269, filed Nov. 3, 1997, now abandoned.
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Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
08/964269 |
Nov 1997 |
US |
Child |
09/357504 |
|
US |