Patent JPS5722982A successfully refreshed from Google Patents.
Patent US3793182A successfully refreshed from Google Patents.
US3793182A
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Hydrocracking process for benzcoronene-contaminated feedstocks
Assignee: Union Oil Company of California
•
Filing: 1973-01-30
•
Granted: 1974-02-19
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Expires: 1993-01-30
Abstract
Abstract Mineral oil feedstocks which contain dissolved benzcoronenes are subjected to hydrocracking over certain catalysts based on a steam treated, metal-cation-deficient Y zeolite while maintaining a sufficient recycle of unconverted oil to bring about, in systems using non-steam-treated Y zeolite catalysts, a substantial buildup and eventual precipitation of benzcoronenes in cooler parts of the systems such as heat exchange surfaces. According to the invention, this buildup and precipitation is prevented by virtue of the higher activity of the steam-treated Y zeolite catalysts for conversion of benzcoronenes, as compared to the more conventional non-steam-treated Y zeolite catalysts.
Inventors
- 👤 J Ward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:58
CPC Classifications
B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/08; B01J29/084; C; C10; C10G; C10G47/00; C10G47/02; C10G47/10; C10G47/12; C10G47/16
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
16 words
A process as defined in claim 1 wherein substantially all of said unconverted oil is recycled.
Claim 2
Dependent Claim
28 words
calcining the resulting ammonium Y zeolite in the presence of sufficient water vapor to reduce the unit cell size of the zeolite by at least about 0.2 percent;
Claim 3
Dependent Claim
27 words
subjecting the calcined zeolite to a second ion-exchange with ammonium salt solution to reduce the sodium content thereof to less than about 3 weight-percent as Na2O; and
Claim 4
Dependent Claim
96 words
A process for hydrocracking a mineral oil feedstock containing dissolved benzcoronenes which comprises contacting said feedstock plus added hydrogen and under hydrocracking conditions with a catalyst comprising a Group VIII metal hydrogenating component supported on a metal-cation-deficient Y zeolite cracking base containing less than about 3 weight-percent Na2O, and which has been previously calcined while in its metal-cation-deficient and/or precursor ammonium form, in the presence of sufficient water vapor to reduce its unit cell size at least about 0.2 percent, recovering from said contacting a desired low-boiling product fraction, and recycling unconverted oil to said contacting.
Claim 5
Dependent Claim
30 words
A process as defined in claim 3 wherein said calcining is carried out at temperatures of about 1,110* - 1,650*F. in the presence of about 5-15 psi of water vapor.
Claim 6
Dependent Claim
12 words
calcining the twice-exchanged zeolite under substantially dry conditions to effect deammoniation thereof.
Claim 7
Dependent Claim
35 words
A process as defined in claim 3 wherein the severity of said calcining is controlled so as to reduce the unit cell size of said Y zeolite cracking base by at least about 0.4 percent.
Claim 8
Dependent Claim
16 words
A process as defined in claim 3 wherein said Group VIII metal is palladium and/or platinum.
Claim 9
Dependent Claim
28 words
A process as defined in claim 3 wherein said feedstock contains at least about 5 ppm of benzcoronenes, and wherein substantially all of said unconverted oil is recycled.
Claim 10
Dependent Claim
33 words
A process as defined in claim 3 wherein said Y zeolite cracking base is at least about 80 percent metal-cation-deficient and contains less than about 1 percent by weight of sodium as Na2O.
Claim 11
Dependent Claim
74 words
A process as defined in claim 3 wherein said Group VIII metal is palladium and/or platinum, said feedstock contains at least about 5 ppm of benzcoronenes, said Y zeolite cracking base is at least about 80 percent metal-cation-deficient and contains less than about one percent by weight of sodium as Na2O, and said calcining is controlled so as to reduce the unit cell size of said cracking base by at least about 0.4 percent.
Claim 12
Dependent Claim
66 words
A process for hydrocracking a mineral oil feedstock containing dissolved benzcoronenes which comprises contacting said feedstock plus added hydrogen and undeR hydrocracking conditions with a catalyst comprising a Group VIII metal hydrogenating component supported on a metal-cation-deficient Y zeolite cracking base, recovering from said contacting a desired low-boiling product fraction, and recycling unconverted oil to said contacting, said Y zeolite cracking base having been prepared by:
Claim 13
Dependent Claim
42 words
A process as defined in claim 10 wherein step (4) is carried out after intimately admixing the zeolite with a finely divided, hydrous oxide selected from the class consisting of alumina, silica, magnesia, beryllia, zirconia, titania, thoria, chromia, clays and combinations thereof.
Claim 14
Dependent Claim
13 words
A process as defined in claim 11 wherein said hydrous oxide comprises alumina.
Claim 15
Dependent Claim
30 words
A process as defined in claim 12 wherein step (2) is carried out at temperatures of about 1,100* - 1,650*F. in the presence of about 5-15 psi of water vapor.
Claim 16
Dependent Claim
38 words
A process as defined in claim 12 wherein the severity of said calcining in step (2) is controlled so as to reduce the unit cell size of said Y zeolite cracking base by at least about 0.4 percent.
Claim 17
Dependent Claim
16 words
A process as defined in claim 12 wherein said Group VIII metal is palladium and/or platinum.
Claim 18
Dependent Claim
28 words
A process as defined in claim 12 wherein said feedstock contains at least about 5 ppm of benzcoronenes, and wherein substantially all of said unconverted oil is recycled.
Claim 19
Dependent Claim
33 words
A process as defined in claim 12 wherein said Y zeolite cracking base is at least about 80 percent metal-cation-deficient and contains less than about one percent by weight of sodium as Na2O.
Claim 20
Dependent Claim
77 words
A process as defined in claim 12 wherein said Group VIII metal is palladium and/or platinum, said feedstock contains at least about 5 ppm of benzcoronenes, said Y zeolite cracking base is at least about 80 percent metal-cation-deficient and contains less than about one percent by weight of sodium as Na2O, and said calcining in step (2) is controlled so as to reduce the unit cell size of said cracking base by at least about 0.4 percent.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |