Patent US4059504A successfully refreshed from Google Patents.
US4059504A
Expired / Lapsed
US
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Hydrotreating of pyrolysis gasoline
Assignee: Lummus Technology LLC
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Filing: 1976-07-21
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Granted: 1977-11-22
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Expires: 1996-07-21
Abstract
Abstract Pyrolysis gasoline is stabilized by hydrotreating in the presence of a catalyst of cobalt-tungsten sulfide supported on high surface area alumina. Dienes are selectively hydrogenated and mercaptan sulfur is reduced, without production of polymer and the product has an ASTM distillation curve essentially identical to the feed.
Inventors
- 👤 William V. Bauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:20
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/70; B01J23/76; B01J23/84; B01J23/85; B01J23/888; C; C10; C10G; C10G2400/00; C10G2400/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
45 words
In a process for selectively hydrogenating dienes in a liquid feed containing dienes, the improvement comprising: effecting said hydrogenating in the presence of a cobalt-tungsten sulfide catalyst supported on high surface area alumina to produce a hydrotreated product without formation of dimers and higher polymers.
Claim 2
Dependent Claim
45 words
In a process for selectively hydrogenating dienes in a liquid feed containing dienes, the improvement comprising: effecting said hydrogenating in the presence of a cobalt-tungsten sulfide catalyst supported on high surface area alumina to produce a hydrotreated product without formation of dimers and higher polymers.
Claim 3
Dependent Claim
37 words
The process of claim 1 wherein the catalyst contains from 0.4% to 15% of cobalt and from 1% to 20% of tungsten, all by weight, and the cobalt to tungsten weight ratio is from 0.25 to 0.75.
Claim 4
Dependent Claim
35 words
The process of claim 2 wherein cobalt is present from 1% to 5%, tungsten is present from 3% to 10%, all by weight, and the cobalt to tungsten weight ratio is from 0.25 to 0.75.
Claim 5
Dependent Claim
32 words
The process of claim 1 wherein the liquid feed is a pyrolysis gasoline, said hydrogenating selectively hydrogenating dienes and styrenes present in the pyrolysis gasoline without significant hydrogenating of aromatics and olefins.
Claim 6
Dependent Claim
23 words
The process of claim 4 wherein the hydrogenating is effected at a reaction zone inlet temperature of from 200° F to 375° F.
Claim 7
Dependent Claim
37 words
The process of claim 5 wherein the catalyst contains from 0.4% to 15% of cobalt and from 1% to 20% of tungsten, all by weight, and the cobalt to tungsten weight ratio is from 0.25 to 0.75.
Claim 8
Dependent Claim
34 words
The process of claim 6 wherein cobalt is present from 1% to 5%, tungsten is present from 3% to 10%, all by weight, the cobalt to tungsten weight ratio is from 0.25 to 0.75.
Claim 9
Dependent Claim
37 words
The process of claim 7 wherein hydrogen is employed in an amount to provide from 10 to 50% in excess of the stoichiometric requirements for saturating one double bond of the dienes and styrenes in the feed.
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) | 1980-11-21 | 1981-05-23 | 1981-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-21 | 1985-05-23 | 1985-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-21 | 1989-05-23 | 1989-11-22 | $7700.00 | Window Closed / Lapsed |