US3929616A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of lubricating oils
Assignee: Texaco Inc
•
Filing: 1974-06-26
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Granted: 1975-12-30
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Expires: 1994-06-26
Abstract
Abstract Lubricating oils of improved viscosity index are prepared from residue-containing oils by a procedure comprising solvent extraction, hydrocracking, deasphalting and dewaxing.
Inventors
- 👤 Theodore C Mead
- 👤 William B Ashton
- 👤 Jr John P Shillinglaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:56
CPC Classifications
C; C10; C10G; C10G67/00; C10G67/02; C10G67/14; C10G2400/00; C10G2400/10
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
71 words
A PROCESS FOR THE PRODUCTION OF A LUBRICATING OIL WHICH COMPRISES CONTACTING A RESIDUE-CONTAINING OIL WITH A SOLVENT HAVING AN AFFINITY FOR AROMATICS TO EXTRACT AROMATIC COMPOUNDS FROM THE OIL, CATALYTICALLY HYDROCRACKING RESULTING RAFFINATE, RECOVERING FROM THE HYDROCRACKED PRPDUCT A FRACTION BOILING IN THE LUBRICATING OIL RANGE, SUBJECTING SAID FRACTION TO DEASPHALTING TREATMENT BY CONTACTING SAME WITH A LOW MOLECULAR WEIGHT PARRAFIN AND SUBJECTING THE DEASPHALTED OIL TO A DEWAXING TREATMENT.
Claim 2
Dependent Claim
71 words
A PROCESS FOR THE PRODUCTION OF A LUBRICATING OIL WHICH COMPRISES CONTACTING A RESIDUE-CONTAINING OIL WITH A SOLVENT HAVING AN AFFINITY FOR AROMATICS TO EXTRACT AROMATIC COMPOUNDS FROM THE OIL, CATALYTICALLY HYDROCRACKING RESULTING RAFFINATE, RECOVERING FROM THE HYDROCRACKED PRPDUCT A FRACTION BOILING IN THE LUBRICATING OIL RANGE, SUBJECTING SAID FRACTION TO DEASPHALTING TREATMENT BY CONTACTING SAME WITH A LOW MOLECULAR WEIGHT PARRAFIN AND SUBJECTING THE DEASPHALTED OIL TO A DEWAXING TREATMENT.
Claim 3
Dependent Claim
14 words
The process of claim 1 in which the residue-containing oil is a vacuum residuum.
Claim 4
Dependent Claim
14 words
The process of claim 1 in which the residue-containing oil is an atmospheric residuum.
Claim 5
Dependent Claim
18 words
The process of claim 1 in which the viscosity index of the residue-containing oil is less than 70.
Claim 6
Dependent Claim
24 words
The process of claim 1 in which the fraction boiling in the lubricating oil range has an initial boiling point between 650* and 675*F.
Claim 7
Dependent Claim
16 words
The process of claim 1 in which the solvent having an affinity for aromatics is N-methyl-2-pyrrolidone.
Claim 8
Dependent Claim
14 words
The process of claim 1 in which the low molecular weight paraffin is propane.
Claim 9
Dependent Claim
41 words
The process of claim 1 in which the dewaxing is effected by contacting the deasphalted oil with a catalyst comprising a hydrogenating component on a support comprising acid-leached mordenite having a silica-alumina mol ratio of at least 20:1 under dewaxing conditions.
Claim 10
Dependent Claim
16 words
The process of claim 1 in which the dewaxing is effected by means of a solvent.
Claim 11
Dependent Claim
18 words
The process of claim 9 in which the solvent is a mixture of methyl ethyl ketone and toluene.
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) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |