US3617525A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Residuum hydrodesulfurization
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1969-04-03
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Granted: 1971-11-02
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Expires: 1989-04-03
Abstract
Abstract An atmospheric residuum is desulfurized by first separating it into a gas oil fraction and a heavy residual fraction, desulfurizing the gas oil in the presence of hydrogen, combining the desulfurized gas oil with the heavy residual fraction and hydrodesulfurizing the mixture.
Inventors
- 👤 Karsten H Moritz
- 👤 Robert C W Welch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:30
CPC Classifications
C; C10; C10G; C10G65/00; C10G2300/00; C10G2300/10; C10G2300/107
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
116 words
A process for removing sulfur from a heavy residuum having a boiling point above about 1,050* F. which comprises: diluting said heavy residuum with a gas oil having a boiling point between about 650* and about 1,050* F. and having a sulfur content of less than 1 weight percent, in a reaction zone containing a sulfactive hydrogenation catalyst; introducing hydrogen into said reaction zone at a rate of about 500 to about 7,500 SCF/bbl.; and reacting said gas oil and heavy residuum with said hydrogen in the presence of said sulfactive hydrogenation catalyst in said reaction zone operating at a temperature between about 500* and 825* F., and at a pressure between 500 and 2,500 p.s.i.g.
Claim 2
Dependent Claim
66 words
A process of claim 2 wherein said catalyst consists of about 1 to about 15 weight percent of nickel or cobalt sulfide, and about 5 to about 25 weight percent tungsten or molybdenum sulfide on an alumina support having a surface area in pores of 30 to 70A. of at least 100 square meters per gram and containing about 1 to about 6 weight percent silica.
Claim 3
Dependent Claim
202 words
A process for removing sulfur from a residual oil having a boiling point above about 650* F. which comprises: separating said residual oil into a gas oil having a boiling point between about 650* and about 1,050* F. and a heavy residuum having a boiling point above about 1,050* F.; introducing hydrogen at a rate of about 500 to about 10,000 SCF/bbl. along with said gas oil into a first reaction zone containing a sulfactive hydrogenation catalyst; reacting said hydrogen and said gas oil in the presence of said catalyst in said first reaction zone at temperatures between about 600* and 850* F. and at pressures between about 300 and 1,000 p.s.i.g. so as to remove substantially all sulfur from said gas oil; diluting said heavy residuum with said substantially desulfurized gas oil in a second reaction zone containing said sulfactive hydrogenation catalyst; introducing hydrogen at a rate of about 500 to about 750 SCF/bbl. into said second reaction zone; and reacting said hydrogen and said gas oil and heavy residuum in the presence of said sulfactive hydrogenation catalyst in said second reaction zone at temperatures between about 500* and 825* F. and at pressures between about 500 and about 2,500 p.s.i.g.
Claim 4
Dependent Claim
70 words
A process according to claim 4 wherein said sulfactive hydrogen catalyst consists of about 1 to about 15 weight percent of nickel or cobalt sulfide, and about 5 to about 25 weight percent tungsten or molybdenum sulfide on an alumina support having a surface area in pores of 30 to 70 A. of at least 100 square meters per gram and containing about 1 to about 6 weight percent silica.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-01 | 1975-05-03 | 1975-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-01 | 1979-05-03 | 1979-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-01 | 1983-05-03 | 1983-11-02 | $7700.00 | Window Closed / Lapsed |