US4647368A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Naphtha upgrading process
Assignee: Mobil Oil AS
•
Filing: 1985-10-15
•
Granted: 1987-03-03
•
Expires: 2005-10-15
Abstract
Abstract An upgrading process for paraffinic naphthas subjects a full range naphtha to hydrocracking over a zeolite beta hydrocracking catalyst to effect a selective, partial hydrocracking in which the higher molecular weight n-paraffinic components of the naphtha are hydrocracked preferentially to the lower molecular weight components with concurrent isomerization of n-paraffins to isoparaffins, to form a hydrocracked effluent which comprises isobutane, C5 to C7 paraffins and relatively higher boiling naphthenes and paraffins. The hydrocracked effluent is split to remove the isobutane and the C5 and C7 paraffins with the balance of the higher boiling components being used as a reformer feed. Removal of the C5 and C7 paraffins permits improved reformer operation with the production of a higher octane product. The isomerization of the paraffins which occurs in the hydrocracking step provides a C5 to C7 paraffinic fraction which is of relatively higher octane number because of the shift to isoparaffins, permitting this component to be used as a gasoline blending component.
Inventors
- 👤 Mary P. McGuiness
- 👤 Kenneth M. Mitchell
- 👤 Robert A. Ware
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:33
CPC Classifications
C; C10; C10G; C10G59/00; C10G59/02
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
178 words
A method for upgrading a paraffinic naphtha including major amounts of C 5 and C 6 components to produce gasoline boiling range products of improved octane number, which comprises (i) hydrocracking the naphtha over a hydrocracking catalyst comprising zeolite beta and a hydrogenation-dehydrogenation component under conditions of elevated temperature and pressure and in the presence of hydrogen and at a conversion of not more than 25 volume percent to C 5- products, to effect a partial, preferential hydrocracking of the paraffins of relatively longer chain length in the naphtha and a concurrent isomerization of n-paraffins, to form a hydrocracking effluent comprising isobutane and higher boiling materials; (ii) fractionating the hydrocracked effluent to form (i) an isobutane stream, (ii) a relatively low boiling stream having a boiling range of approximately C 5 to 200° F. and comprising C 5 to C 7 iso-paraffins, and (iii) a relatively higher boiling stream having an initial boiling point of approximately 200° F., and (iii) reforming the relatively high boiling point stream to form a gasoline boiling range product of improved octane rating.
Claim 2
Independent Claim
178 words
A method for upgrading a paraffinic naphtha including major amounts of C 5 and C 6 components to produce gasoline boiling range products of improved octane number, which comprises (i) hydrocracking the naphtha over a hydrocracking catalyst comprising zeolite beta and a hydrogenation-dehydrogenation component under conditions of elevated temperature and pressure and in the presence of hydrogen and at a conversion of not more than 25 volume percent to C 5- products, to effect a partial, preferential hydrocracking of the paraffins of relatively longer chain length in the naphtha and a concurrent isomerization of n-paraffins, to form a hydrocracking effluent comprising isobutane and higher boiling materials; (ii) fractionating the hydrocracked effluent to form (i) an isobutane stream, (ii) a relatively low boiling stream having a boiling range of approximately C 5 to 200° F. and comprising C 5 to C 7 iso-paraffins, and (iii) a relatively higher boiling stream having an initial boiling point of approximately 200° F., and (iii) reforming the relatively high boiling point stream to form a gasoline boiling range product of improved octane rating.
Claim 3
Dependent Claim
19 words
A method according to claim 1 in which C 8 paraffins in the naphtha undergo hydrocracking to form isobutane.
Claim 4
Dependent Claim
21 words
A process according to claim 1 in which C 9 paraffins in the naphtha are hydrocracked to form isobutane and isopentane.
Claim 5
Dependent Claim
21 words
A process according to claim 1 in which C 10 paraffins in the naphtha are hydrocracked to form isobutane and isopentane.
Claim 6
Dependent Claim
26 words
A process according to claim 2 in which C 8 paraffins in the naphtha are hydrocracked to form isobutane and isomerized to form C 8 isoparaffins.
Claim 7
Dependent Claim
22 words
A process according to claim 1 in which the 200° F.+ reformer feed comprises C 6+ naphthenes, C 8+ paraffins and aromatics.
Claim 8
Dependent Claim
21 words
A process according to claim 1 in which the relatively low boiling fraction comprises principally C 6 and C 7 paraffins.
Claim 9
Dependent Claim
28 words
A process according to claim 1 in which the hydrocracking catalyst comprises a metal of groups VA, VIA, VIIA or VIIIA of the Periodic Table and zeolite beta.
Claim 10
Dependent Claim
18 words
A process according to claim 1 in which the hydrocracking catalyst comprises platinum or palladium and zeolite beta.
Claim 11
Dependent Claim
23 words
A process according to claim 8 in which the hydrocracking catalyst comprises a base metal or combination of base metals and zeolite beta.
Claim 12
Dependent Claim
27 words
A process according to claim 10 in which the hydrocracking catalyst comprises zeolite beta and at least one base metal selected from nickel, cobalt, tungsten or molybdenum.
Claim 13
Dependent Claim
19 words
A process according to claim 1 in which the zeolite beta has a silica:alumina ratio of at least 30:1.
Claim 14
Dependent Claim
24 words
A process according to claim 1 in which the hydrocracking catalyst comprises 10 to 95 percent by weight zeolite beta in an alumina binder.
Claim 15
Dependent Claim
24 words
A process according to claim 1 in which the hydrocracking catalyst comprises 40 to 70 percent by weight zeolite beta in an alumina binder.
Claim 16
Dependent Claim
17 words
A process according to claim 1 in which the naphtha is hydrotreaed prior to the hydrocracking step.
Claim 17
Dependent Claim
25 words
A method according to claim 1 in which the conversion in the hydrocracking step is not more than 10 volume percent to C 5- products.
References Cited (Backward Citations)
US2905619A
Cited
US3663424A
Cited
US3770614A
Cited
US3788975A
Cited
US3758628A
Cited
US3843510A
Cited
US3933619A
Cited
US3923641A
Cited
US3953320A
Cited
US3974061A
Cited
US4162212A
Cited
US4191634A
Cited
US4241231A
Cited
US4181599A
Cited
US4304657A
Cited
US4419220A
Cited
US4428819A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-03-02 | 1990-09-01 | 1991-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-02 | 1994-09-01 | 1995-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-02 | 1998-09-01 | 1999-03-03 | $7700.00 | Window Closed / Lapsed |