Patent US3917566A successfully refreshed from Google Patents.
US3917566A
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Process for manufacture of lubricating oil
Assignee: Mobil Oil AS
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Filing: 1974-08-08
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Granted: 1975-11-04
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Expires: 1994-08-08
Abstract
Abstract A stabilized lubricating oil having acceptable corrosion properties and being resistant to oxidation and sludge formation upon exposure to an oxidative environment is prepared without forming undesirable color bodies therein by the sequential steps of: A. CONTACTING THE LUBRICATING OIL STOCK WITH A SMALL AMOUNT OF ELEMENTAL SULFUR OF FROM ABOUT 0.05 TO ABOUT 1.0 PERCENT BY WEIGHT AT A CONTACT TEMPERATURE OF FROM ABOUT 25*C to about 130*C, b. contacting the product oil of step (a) with from about 10 to about 50 weight percent sulfide-forming metal at a contact temperature of from about 25*C to about 150*C, and C. SEPARATING THE PRODUCT OIL OF STEP (B) FROM THE METAL SULFIDE-CONTAINING RESIDUE THEREIN FORMED.
Inventors
- 👤 Eric J Y Scott
- 👤 Robert L Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:23
CPC Classifications
C; C10; C10G; C10G29/00; C10G29/02
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
147 words
A PROCESS FOR FORMING A STABILIZED LUBRICATING OIL HAVING ACCEPTABLE CORROSION PROPERTIES AND BEING RESISTANT TO OXIDATION AND SLUDGE FORMATION UPON EXPOSURE TO AN OXIDATIVE ENVIROMENT WHICH COMPRISES THE SEQUENTIAL STEPS OF (A) CONTACTING A HYDROCARBON LUBRICATING OIL STOCK WITH ELEMENTAL SULFUR IN AN AMOUNT OF FROM ABOUT 0.05 TO ABOUT 1.0 PERCENT BY WEIGHT OF SAID OIL STOCK AT A CONTACT TEMPERATURE OF FROM ABOUT 25* TO ABOUT 130*C AND PRESSURE OF FROM ABOUT 0 PSIG TO ABOUT 100 PSIG, (B) CONTACTING THE PRODUCT OIL OR STEP (A) CONTAINING UNREACTED SULFUR WITH FROM ABOUT 10 TO ABOUT 50 WEIGHT PERCENT SULFIDE-FORMING METAL AT A CONTACT TEMPERATURE OF FROM ABOUT 25* TO ABOUT 150*C AND PRESSURE OF FROM ABOUT 0 PSIG TO ABOUT 100 PSIG, THEREBY FORMING A METAL SULFIDE-CONTAINING RESIDUE, AND (C) SEPARATING THE PRODUCT OIL OF STEP (B) FROM THE METAL SULFIDE-CONTAINING RESIDUE THEREIN FORMED.
Claim 2
Dependent Claim
147 words
A PROCESS FOR FORMING A STABILIZED LUBRICATING OIL HAVING ACCEPTABLE CORROSION PROPERTIES AND BEING RESISTANT TO OXIDATION AND SLUDGE FORMATION UPON EXPOSURE TO AN OXIDATIVE ENVIROMENT WHICH COMPRISES THE SEQUENTIAL STEPS OF (A) CONTACTING A HYDROCARBON LUBRICATING OIL STOCK WITH ELEMENTAL SULFUR IN AN AMOUNT OF FROM ABOUT 0.05 TO ABOUT 1.0 PERCENT BY WEIGHT OF SAID OIL STOCK AT A CONTACT TEMPERATURE OF FROM ABOUT 25* TO ABOUT 130*C AND PRESSURE OF FROM ABOUT 0 PSIG TO ABOUT 100 PSIG, (B) CONTACTING THE PRODUCT OIL OR STEP (A) CONTAINING UNREACTED SULFUR WITH FROM ABOUT 10 TO ABOUT 50 WEIGHT PERCENT SULFIDE-FORMING METAL AT A CONTACT TEMPERATURE OF FROM ABOUT 25* TO ABOUT 150*C AND PRESSURE OF FROM ABOUT 0 PSIG TO ABOUT 100 PSIG, THEREBY FORMING A METAL SULFIDE-CONTAINING RESIDUE, AND (C) SEPARATING THE PRODUCT OIL OF STEP (B) FROM THE METAL SULFIDE-CONTAINING RESIDUE THEREIN FORMED.
Claim 3
Dependent Claim
16 words
The process of claim 1 wherein said contacting step (a) is accomplished in an ultrasonic bath.
Claim 4
Dependent Claim
46 words
The process of claim 1 wherein said elemental sulfur is present in step (a) in an amount of from about 0.1 to about 0.5 percent by weight of said oil stock and said contact temperature in step (a) is from about 25* to about 70*C. .
Claim 5
Dependent Claim
34 words
The process of claim 1 wherein saidi sulfide-forming metal of step (b) is selected from the gorup consisting of metals of Groups IB, IIB, IVA and VIII of the Periodic Table of the Elements.
Claim 6
Dependent Claim
34 words
The process of claim 3 wherein said sulfide-forming metal of step (b) is selected from the group consisting of metals of Groups IB, IIB, IVA and VIII of the Periodic Table of the Elements.
Claim 7
Dependent Claim
19 words
The process of claim 1 wherein said contact temperature in step (b) is from about 35* to about 90*C.
Claim 8
Dependent Claim
19 words
The process of claim 1 wherein said elemental sulfur in step (a) is provided by an added sulfur precursor.
Claim 9
Dependent Claim
41 words
The process of claim 7 wherein said sulfur precursor is one selected from the group consisting of H2S, HRS, RSxH, HSxH and RSxR, wherein R is a hydrocarbyl group and x is an integer of from 1 to 4 or more.
Claim 10
Dependent Claim
21 words
The process of claim 1 wherein said elemental sulfur in step (a) is provided by one or more added organo-sulfur compounds.
Claim 11
Dependent Claim
14 words
The process of claim 1 wherein said elemental sulfur in step (a) is crystalline.
Claim 12
Dependent Claim
18 words
The process of claim 10 wherein said crystalline sulfur is obtained by recrystallization of sublimed sulfur from toluene.
Claim 13
Dependent Claim
16 words
The process of claim 1 wherein said oil stock has a boiling range above about 600*F.
Claim 14
Dependent Claim
37 words
The process of claim 12 wherein said oil stock comprises at least a substantial part of one obtained by fractionation of a crude oil identified as Pennsylvania, Midcontinent, Gulf Coast, West Texas, Amal, Kuwait, Barco or Arabian.
Claim 15
Dependent Claim
20 words
The process of claim 13 wherein said oil stock is one obtained by fractionation of crude oil identified as Arabian.
Claim 16
Dependent Claim
14 words
The process of claim 1 wherein said sulfide-forming metal in step (b) is copper.
Claim 17
Dependent Claim
14 words
the process of claim 5 wherein said sulfide-forming metal in step (b) is copper.
Claim 18
Dependent Claim
14 words
The process of claim 6 wherein said sulfide-forming metal in step (b) is copper.
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) | 1978-11-03 | 1979-05-05 | 1979-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-03 | 1983-05-05 | 1983-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-03 | 1987-05-05 | 1987-11-04 | $7700.00 | Window Closed / Lapsed |