US3730876A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of naphthenic oils
Assignee: Individual
•
Filing: 1970-12-18
•
Granted: 1973-05-01
•
Expires: 1990-12-18
Abstract
Abstract Naphthenic oils are prepared by hydrocracking a petroleum residuum and catalytically dewaxing the lubricating oil so produced. The dewaxed oil is then subjected to solvent extraction or mild hydrogenation.
Inventors
- 👤 A Sequeira
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:29
CPC Classifications
C; C10; C10G; C10G45/00; C10G45/58; C10G45/60; C10G45/64; C10G2400/00; C10G2400/10; Y; Y10; Y10S; Y10S208/00; Y10S208/02
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
13 words
The process of claim 1 in which the charge is a vacuum residuum.
Claim 2
Dependent Claim
18 words
The process of claim 1 in which the dewaxing catalyst has a silica:alumina ratio of at least 40.
Claim 3
Dependent Claim
35 words
The process of claim 1 in which the surface area is between 280 and 400 m2/g, the pore volume is between 0.6 and 1.0 cc/g and the average pore diameter is between 70 and 90A.
Claim 4
Dependent Claim
14 words
The process of claim 1 in which the catalytically dewaxed oil is mildly hydrogenated.
Claim 5
Dependent Claim
18 words
The process of claim 1 in which the catalytically dewaxed oil is subjected to a solvent extraction treatment.
Claim 6
Dependent Claim
11 words
The process of claim 6 in which the solvent is furfural.
Claim 7
Dependent Claim
12 words
The process of claim 6 in which the solvent is N-methyl pyrollidone.
Claim 8
Dependent Claim
21 words
The process of claim 5 in which the entire effluent of the dewaxing zone is introduced into the mild hydrogenation zone.
Claim 9
Dependent Claim
84 words
The process of claim 1 in which the charge is introduced into a fixed bed of hydrocracking catalyst at an intermediate point thereof and at least 3,000 SCF hydrogen per barrel of charge is introduced at the lower end of said bed to flow countercurrently to downwardly flowing heavier components of said charge and concurrently with upwardly flowing lighter components of said charge and the products of the hydrocracking reaction and removing from the hydrocracking zone an overhead product containing a lube oil fraction.
Claim 10
Dependent Claim
16 words
The process of claim 10 in which the entire overhead is introduced into the dewaxing zone.
Claim 11
Dependent Claim
19 words
The process of claim 11 in which the entire dewaxing zone effluent is introduced into a mild hydrogenAtion zone.
References Cited (Backward Citations)
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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) | 1976-04-30 | 1976-10-30 | 1977-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-30 | 1980-10-30 | 1981-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-30 | 1984-10-30 | 1985-05-01 | $7700.00 | Window Closed / Lapsed |