US3819508A
Expired / Lapsed
US
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Method of purifying lubricating oils
Assignee: Individual
•
Filing: 1973-06-04
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Granted: 1974-06-25
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Expires: 1993-06-04
Abstract
Abstract A method of purifying used lubricating oils comprising the following steps: 1. Admixing the used lubricating oil with a mutually soluble predominantly hydrocarbon liquid diluent which preferably has a boiling range within the temperature region of about 100*F. to about 550*F.; 2. Admixing the diluted lubricating oil with a water miscible alcohol and water mixture containing a small amount of an ammonium or alkali metal base, and 3. Centrifuging to remove sludge and metal compounds from the oil and to separate the diluted oil phase from the alcoholwater phase to provide a purified organic layer having a low ash content.
Inventors
- 👤 M Fainman
- 👤 C Mccauley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:34
CPC Classifications
C; C10; C10M; C10M175/00; C10M175/0016
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
29 words
ADMIXING THE USED LUBRICATING OIL WITH A MUTUALLY SOLUBLE PREDOMINANTLY HYDROCARBON LIQUID DILUENT WHICH PREFERABLY HAS A BOILING RANGE WITHIN THE TEMPERATURE REGION OF ABOUT 100*F. TO ABOUT 550*F.,
Claim 2
Dependent Claim
29 words
ADMIXING THE USED LUBRICATING OIL WITH A MUTUALLY SOLUBLE PREDOMINANTLY HYDROCARBON LIQUID DILUENT WHICH PREFERABLY HAS A BOILING RANGE WITHIN THE TEMPERATURE REGION OF ABOUT 100*F. TO ABOUT 550*F.,
Claim 3
Dependent Claim
25 words
ADMIXING THE DILUTED LUBRICATING OIL WITH A WATER MISCIBLE ALCOHOL AND WATER MIXTURE CONTAINING A SMALL AMOUNT OF AN AMMONIUM OR ALKALI METAL BASE, AND
Claim 4
Dependent Claim
25 words
ADMIXING THE DILUTED LUBRICATING OIL WITH A WATER MISCIBLE ALCOHOL AND WATER MIXTURE CONTAINING A SMALL AMOUNT OF AN AMMONIUM OR ALKALI METAL BASE, AND
Claim 5
Dependent Claim
32 words
The method of claim 1 wherein the ratio of the predominantly hydrocarbon liquid diluent with respect to the used lubricating oil being treated ranges from about 2:1 to about 1:2 by volume.
Claim 6
Dependent Claim
35 words
The method of claim 1 wherein the quantity of the ammonium or alkali metal base is sufficient to displace polyvalent metal ions from the various metallic soaps contained in the used lubricating oil undergoing treatment.
Claim 7
Dependent Claim
32 words
CENTRIFUGAL TO REMOVE SLUDGE AND METAL COMPOUNDS FROM THE OIL AND TO SEPARATE THE DILUTED OIL PHASE FROM THE ALCOHOL-WATER PHASE TO PROVIDE A PURIFIED ORGANIC LAYER HAVING A LOW ASH CONTENT.
Claim 8
Dependent Claim
32 words
CENTRIFUGAL TO REMOVE SLUDGE AND METAL COMPOUNDS FROM THE OIL AND TO SEPARATE THE DILUTED OIL PHASE FROM THE ALCOHOL-WATER PHASE TO PROVIDE A PURIFIED ORGANIC LAYER HAVING A LOW ASH CONTENT.
Claim 9
Dependent Claim
21 words
The method of claim 2 wherein the water-miscible alcohol is methanol, ethanol, isopropyl alcohol, n-propyl alcohol, sec-butyl alcohol or tert-butyl alcohol.
Claim 10
Dependent Claim
17 words
The method of claim 2 wherein the water-miscible alcohol is isopropyl alcohol, tert-butyl alcohol or nPropyl alcohol.
Claim 11
Dependent Claim
24 words
The method of claim 5 wherein the water-miscible alcohol-water mixture contains from about 40 percent to about 60 percent by volume of the alcohol.
Claim 12
Dependent Claim
27 words
The method of claim 2 wherein about one-half to about one volume of the water-miscible alcohol-water mixture are employed for each volume of the diluted lubricating oil.
Claim 13
Dependent Claim
27 words
The method of claim 4 wherein about one-half to about one volume of the water-miscible alcohol-water mixture are employed for each volume of the diluted lubricating oil.
Claim 14
Dependent Claim
27 words
The method of claim 5 wherein about one-half to about one volume of the water-miscible alcohol-water mixture are employed for each volume of the diluted lubricating oil.
Claim 15
Dependent Claim
27 words
The method of claim 6 wherein aboUt one-half to about one volume of the water-miscible alcohol-water mixture are employed for each volume of the diluted lubricating oil.
Claim 16
Dependent Claim
16 words
The method of claim 1 wherein the base is sodium carbonate, potassium carbonate, or sodium phosphate.
Claim 17
Dependent Claim
16 words
The method of claim 5 wherein the base is sodium carbonate, potassium carbonate, or sodium phosphate.
Claim 18
Dependent Claim
16 words
The method of claim 9 wherein the base is sodium carbonate, potassium carbonate, or sodium phosphate.
Claim 19
Dependent Claim
41 words
The method of claim 1 including the steps of: distilling the diluted oil phase obtained from the centrifuging to obtain a light naphtha cut, and recycling the light naphtha cut to the process for use as the predominantly hydrocarbon liquid diluent.
Claim 20
Independent Claim
132 words
A method of purifying a used lubricating oil comprising: admixing the used lubricating oil with a mutually soluble predominantly hydrocarbon liquid diluent with the volume ratio of liquid diluent to used lubricating oil ranging from about 2: 1 to about 1:2 and the liquid diluent having a boiling range within the temperature region of about 100*F. to about 500*F.; admixing the diluted lubricating oil with a mixture of isopropyl alcohol, n-propyl alcohol, or tert-butyl alcohol and water which contains a small amount of an ammonium or alkali metal base with about one-half to about one volume of the alcohol-water mixture being employed for each volume of the diluted lubricating oil, and centrifuging to remove sludge and metal compounds from the oil and to separate the diluted oil phase from the alcohol-water phase.
Claim 21
Independent Claim
132 words
A method of purifying a used lubricating oil comprising: admixing the used lubricating oil with a mutually soluble predominantly hydrocarbon liquid diluent with the volume ratio of liquid diluent to used lubricating oil ranging from about 2: 1 to about 1:2 and the liquid diluent having a boiling range within the temperature region of about 100*F. to about 500*F.; admixing the diluted lubricating oil with a mixture of isopropyl alcohol, n-propyl alcohol, or tert-butyl alcohol and water which contains a small amount of an ammonium or alkali metal base with about one-half to about one volume of the alcohol-water mixture being employed for each volume of the diluted lubricating oil, and centrifuging to remove sludge and metal compounds from the oil and to separate the diluted oil phase from the alcohol-water phase.
Claim 22
Dependent Claim
18 words
The method of claim 15 wherein the alkali metal base is sodium carbonate, potassium carbonate, or sodium phosphate.
Claim 23
Dependent Claim
32 words
The process of claim 16 wherein the quantity of the base is sufficient to displace the polyvalent metal ions from the various metallic soaps contained in the used lubricating oil undergoing treatment.
Claim 24
Dependent Claim
21 words
The process of claim 15 wherein the alcohol-water mixture contains from about 40 to about 60 percent by volume of alcohol.
Claim 25
Dependent Claim
15 words
The method of claim 1 wherein said alcohol is a mixture of water miscible alcohols.
Claim 26
Independent Claim
67 words
A method of purifying a used lubricating oil comprising: admixing the used lubricating oil with a mutually soluble predominantly hydrocarbon liquid diluent; admixing the diluted lubricating oil with a water-miscible alcohol and water mixture containing a small amount of an ammonium or alkali metal base, and centrifuging to remove sludge and metal compounds from the oil and to separate the diluted oil phase from the alcohol-water phase.
Claim 27
Independent Claim
67 words
A method of purifying a used lubricating oil comprising: admixing the used lubricating oil with a mutually soluble predominantly hydrocarbon liquid diluent; admixing the diluted lubricating oil with a water-miscible alcohol and water mixture containing a small amount of an ammonium or alkali metal base, and centrifuging to remove sludge and metal compounds from the oil and to separate the diluted oil phase from the alcohol-water phase.
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) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |