Patent US3669875A successfully refreshed from Google Patents.
US3669875A
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US
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Two-stage reforming process
Assignee: Mobil Oil AS
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Filing: 1969-10-13
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Granted: 1972-06-13
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Expires: 1989-10-13
Abstract
Abstract A naphtha hydrocarbon fraction is reformed in a plurality of catalytic reforming zones under conditions which are particularly selective for effecting naphthene dehydrogenation in a first stage and paraffin cyclization to form aromatics in a second stage so that below about 5 weight percent of naphthenes remain in the paraffin-rich charge passed to the second stage operated at a space velocity greater than 3 LHSV and maintained at a pressure below about 100 psig.
Inventors
- 👤 Charles J Plank
- 👤 Pharez G Waldo
- 👤 Harry G Doherty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:36
CPC Classifications
C; C10; C10G; C10G59/00; C10G59/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
35 words
The method of claim 1 wherein the platinum type reforming catalyst is platinum dispersed on an alumina matrix promoted with chlorine and sulfur is maintained in the charge during cyclization of paraffins to form aromatics.
Claim 2
Dependent Claim
26 words
The method of claim 1 wherein the platinum type reforming catalyst is a bimetallic reforming catalyst which relies upon a metal halide complex as a promoter.
Claim 3
Dependent Claim
35 words
The method of claim 1 wherein the moisture level of the reforming operation is restricted to within the range of 5 to 25 ppm of water as measured in the gaseous effluent of the process.
Claim 4
Dependent Claim
40 words
The method of claim 1 wherein a bimetallic platinum containing reforming catalyst is employed under restricted moisture conditions and the catalyst has an acid function which is controlled during paraffin conversion by the addition of chlorine with the paraffin charge.
Claim 5
Dependent Claim
36 words
The method of claim 1 wherein hydrogen is generated during the reforming operation and the generated hydrogen is relied upon to maintain the desired hydrogen to hydrocarbon ratio employed in each step of the reforming operation.
References Cited (Backward Citations)
US2870084A
Cited
US2952611A
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US3111480A
Cited
US3287253A
Cited
US3392107A
Cited
US3424669A
Cited
US3474026A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |