US3620967A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rerefining of waste crankcase and like oils
Assignee: QUVOE CHEMICAL IND
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Filing: 1968-05-01
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Granted: 1971-11-16
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Expires: 1988-05-01
Abstract
Abstract A method of treating waste crankcase and like oils to remove impurities therein which are suspended by high detergent and like additives. A method is disclosed for adding chemical compounds which disrupt the gas and liquid films adsorbed on the colloidal sized contaminant particles, particularly iron and ironcontaining compounds, which are held in suspension by the detergent additives. It is preferred to use compounds which generate free hydroxyl radicals, such as hydrogen peroxide and other peroxide compounds, as well as metal halides such as aluminum chloride, ferric chloride, methyl magnesium bromide, and the like, preferably in a basic medium, with agitation or heating, or both, of the oil. The treatment removes colloidal iron as well as organometallic iron contained in the oil. Precipitation of components of the bottom sediment and water fraction of waste crankcase oil is followed by drawing off of the top layer of oil which may then be further treated, or which may be fed to a still for distillation and fractionation thereof.
Inventors
- 👤 Graham L Gulick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:10
CPC Classifications
C; C10; C10M; C10M175/00; C10M175/0016
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
172 words
A method of removing contaminants suspended in waste crankcase oil by detergents and other additives, without substantial destruction of said detergents and other additives, said method comprising treating a body of said waste crankcase oil not previously treated with strong mineral acids with from about 0.005 percent to about 10 percent by weight of a concentrated solution of a compound which, in aqueous solution, forms a strong inorganic base or acid, and with from about 0.005 percent to about 10 percent by weight of a treating compound which is adapted to generate free radicals, said compound being selected from the class consisting of inorganic peroxides, organic peroxides, hypochlorites, perchlorates, and peracids which are nondestructive to oil detergents and additives, intimately mixing said treating compound with said waste crankcase oil, allowing said treated waste crankcase oil to stand for a period sufficient to allow sedimentation of the contaminants suspended in said oil by said detergents and other additives, and drawing off the oil thus treated from the oil layer above said precipitated contaminants.
Claim 2
Dependent Claim
15 words
A method as defined in claim 2 in which said treating compound is hydrogen peroxide.
Claim 3
Independent Claim
176 words
A method of removing contaminants suspended in waste crankcase oil by detergents and other additives, without substantial destruction of said detergents and other additives, said method comprising treating a body of said waste crankcase oil not previously treated with strong mineral acids with from about 0.005 percent to about 10 percent by weight of a treating compound which is adapted to generate free radicals, said compound being selected from the class consisting of inorganic peroxides, organic peroxides, hypochlorites, perchlorates, and peracids which are nondestructive to oil detergents and additives, of intimately mixing said treating compound with said waste crankcase oil to stand for a period sufficient to allow sedimentation of the contaminants suspended in said oil by said detergents and other additives, drawing off the oil thus treated from the oil layer above said precipitated contaminants, and thereafter treating the oil thus drawn off with a compound from the class consisting of aluminum chloride and ferric chloride, intimately mixing sAid chloride compound with said oil, and physically separating precipitated impurities from the body of said oil.
Claim 4
Dependent Claim
34 words
A method as defined in claim 2 in which said treating compound is present in substantially less than a stoichiometric quantity relative to the active ingredients in the contaminants in said waste crankcase oil.
Claim 5
Dependent Claim
20 words
A method as defined in claim 2 in which said concentrated solution is a solution of an alkaline metal hydroxide.
Claim 6
Independent Claim
176 words
A method of refining waste crankcase oil which includes iron particles colloidally dispersed therein, said iron particles including air and water intimately associated therewith to form a composite colloidal particle, said composite particles being suspended in said oil by a detergent material, said composite colloidal particles having a density substantially equal to the density of the body of said waste crankcase oil, and wherein said composite particles resist precipitation by addition to said oil of dilute acid and caustic solutions, said method comprising, selecting a body of said waste crankcase oil which has not been previously treated with strong mineral acids, and electrolytically altering the electric charge contained in the surface of said composite particles by treatment of said oil with a reactive compound adapted to generate free radicals and selected from the class consisting of inorganic peroxides, organic peroxides, hypochlorites, perchlorates and peracids which are nondestructive to oil detergents and additives, and allowing said composite particles to coalesce and precipitate, while agitating said mixture so as to separate said adsorbed air from said composite particles.
Claim 7
Dependent Claim
29 words
A method as defined in claim 2 in which said intimate mixing includes the step of heating said crankcase oil to about 100* F., and physically agitating said oil.
Claim 8
Dependent Claim
39 words
A method as defined in claim 2 in which said treating compound is a peroxide compound and in which said intimate mixing includes the step of heating said crankcase oil to above 100* F., and physically agitating said oil.
Claim 9
Dependent Claim
28 words
A method as defined in claim 2 in which said intimate mixing comprises heat and agitation, and in which said concentrated solution is a solution of sodium hydroxide.
Claim 10
Independent Claim
177 words
A method of refining waste crankcase oil not previously treated with strong mineral acids and which includes iron particles colloidally dispersed therein, said iron particles including air and water intimately associated therewith to form a composite colloidal particle, said composite particles being suspended in said oil by a detergent material, said composite colloidal particles having a density substantially equal to the density of the body of said waste crankcase oil, and wherein said composite particles resist precipitation by addition to said oil of dilute acid and caustic solutions, said method comprising electrolytically altering the electric charge contained in the surface of said composite particles by treatment of said oil with a reactive compound adapted to generate free radicals and selected from the class consisting of inorganic peroxides, organic peroxides, hypochlorites, perchlorates and peracids which are nondestructive to oil detergents and additives, and allowing said composite particles to coalesce and precipitate, while heating said oil from room temperature to at least 100* F. and agitating said oil so as to separate said adsorbed air from said composite particles.
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) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |