US3879282A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reclaiming used motor oil by chemical treatment with ammonium phosphate
Assignee: Phillips Petroleum Co
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Filing: 1974-02-26
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Granted: 1975-04-22
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Expires: 1994-02-26
Abstract
Abstract A method is provided for reducing the ash content and the lead content of used motor oil by contacting the used oil with an aqueous solution of an ammonium phosphate. In one embodiment of the invention a used motor oil is treated in an integrated ecological method for removal of contained metal salts, tetraethyllead, gasoline, ammonia, and hydrogen sulfide so that removal of each of these contaminates can be accomplished without contaminating the environment by returning the removed components to the environment.
Inventors
- 👤 Marvin M Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:35
CPC Classifications
C; C10; C10M; C10M175/00; C10M175/0016; C10G; C10G29/00; C10G29/06; C10G29/08
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
70 words
A method for reducing the ash content of used motor oil said method comprising (a) contacting said used oil with an aqueous solution of an ammonium phosphate reagent at conditions of temperature and pressure sufficient to react said ammonium phosphate with metal salts present in the used motor oil, (b) allowing the precipitate formed by the reaction to settle, and (c) separating the oil from the water and solid precipitate.
Claim 2
Independent Claim
70 words
A method for reducing the ash content of used motor oil said method comprising (a) contacting said used oil with an aqueous solution of an ammonium phosphate reagent at conditions of temperature and pressure sufficient to react said ammonium phosphate with metal salts present in the used motor oil, (b) allowing the precipitate formed by the reaction to settle, and (c) separating the oil from the water and solid precipitate.
Claim 3
Independent Claim
70 words
A METHOD FOR REDUCING THE ASH CONTENT OF USED MOTOR OIL SAID METHOD COMPRISING (A) CONTACTING SAID USED OIL WITH AN AQUEOUS SOLUTION OF AN AMMONIUM PHOSPHATE REAGENT AT CONDITIONS OF TEMPERATURE AND PRESSURE SUFFICIENT TO REACT SAID AMMONIUM PHOSPHATE WITH METAL SALTS PRESENT IN THE USED MOTOR OIL, (B) ALLOWING THE PRECIPITATE FORMED BY THE REACTION TO SETTLE, AND (C) SEPARATING THE OIL FROM THE WATER AND SOLIID PRECIPITATE.
Claim 4
Independent Claim
70 words
A METHOD FOR REDUCING THE ASH CONTENT OF USED MOTOR OIL SAID METHOD COMPRISING (A) CONTACTING SAID USED OIL WITH AN AQUEOUS SOLUTION OF AN AMMONIUM PHOSPHATE REAGENT AT CONDITIONS OF TEMPERATURE AND PRESSURE SUFFICIENT TO REACT SAID AMMONIUM PHOSPHATE WITH METAL SALTS PRESENT IN THE USED MOTOR OIL, (B) ALLOWING THE PRECIPITATE FORMED BY THE REACTION TO SETTLE, AND (C) SEPARATING THE OIL FROM THE WATER AND SOLIID PRECIPITATE.
Claim 5
Dependent Claim
24 words
A method of claim 1 wherein the ammonium phosphate is chosen from among triammonium phosphate, diammonium hydrogen phosphate, ammonium dihydrogen phosphate, and mixtures thereof.
Claim 6
Dependent Claim
52 words
A method of claim 1 wherein the reaction temperature is in the range of about 200* to about 500*F, the reaction pressure is in the range of about atmospheric to about 750 psig, and the concentration of ammonium phosphate in the aqueous reaction solution is about 2 to about 25 weight percent.
Claim 7
Independent Claim
68 words
A method for reducing the lead content of used motor oil, said method comprising: (a) contacting said oil with an aqueous solution of ammonium phosphate reagent at conditions of temperature and pressure sufficient to react said ammonium phosphate with lead compounds present in the used motor oil, (b) allowing the precipitate formed by the reaction to settle, and (c) separating the oil from the water and solid precipitate.
Claim 8
Independent Claim
68 words
A method for reducing the lead content of used motor oil, said method comprising: (a) contacting said oil with an aqueous solution of ammonium phosphate reagent at conditions of temperature and pressure sufficient to react said ammonium phosphate with lead compounds present in the used motor oil, (b) allowing the precipitate formed by the reaction to settle, and (c) separating the oil from the water and solid precipitate.
Claim 9
Dependent Claim
24 words
A method of claim 4 wherein the ammonium phosphate is chosen from among triammonium phosphate, diammonium hydrogen phosphate, ammonium dihydrogen phosphate, and mixtures thereof.
Claim 10
Dependent Claim
52 words
A method of claim 4 wherein the reaction temperature is in the range of about 200* to about 500*F, the reaction pressure is in the range of about atmospheric to about 750 psig, and the concentration of ammonium phosphate in the aqueous reaction solution is about 2 to about 25 weight percent.
Claim 11
Independent Claim
158 words
A METHOD FOR RECLAIMING USED MOTRO OIL CONTAINING METAL SALTS, SAID METHOD COMPRISING: (A) PREHEATING THE USED MOTOR OIL TO A TEMPERATURE IN THE RANGE OF 200* TO ABOUT 500*F, (B) PREHEATING AN AQUEOUS SOLUTION OF AMMONIUM PHOSPHATE TO A TEMPERATURE IN THE RANGE OF ABOUT 200* TO ABOUT 500*F, (C) CONTACTING SAID PREHEATED MOTOR OIL AND SAID PREHEATED AQUEOUS SOLUTION OF AMMONIUM PHOSPHATE IN AT LEAST ONE AGITATED REACTOR AT CONDITIONS SUFFICIENT TO MAINTAIN A REACTION PRODUCING A PRECIPITATE, (D) ALLOWING THE REACTION PRODUCT TO SEPARATED INTO AN OIL LAYER AND A WATER LAYER AND THE PRECIPITATE TO SETTLE IN THE WATER LAYER (E) REMOVING THE WATER LAYER AND FILTERING THE PRECIPITATE FROM THE WATER, (F) ADDING SUFFICIENT AMMONUIM PHOSPHATE TO THE FILTERED WATER TO PRODUCE AN AQUEOUS SOLUTION OF AMMONIUM PHOSPHATE HAVING A CONCENTRATION OF ABOUT 2 TO ABOUT 25 WEIGHT PERCENT AMMONIUM PHOSPHATE AND RECIRCULATE THROUGH THE PREHEATER IN (B), AND (G) REMOVING THE OIL.
Claim 12
Independent Claim
158 words
A method for reclaiming used motor oil containing metal salts, said method comprising: (a) preheating the used motor oil to a temperature in the range of 200* to about 500*F, (b) preheating an aqueous solution of ammonium phosphate to a temperature in the range of about 200* to about 500*F, (c) contacting said preheated motor oil and said preheated aqueous solution of ammonium phosphate in at least one agitated reactor at conditions sufficient to maintain a reaction producing a precipitate, (d) allowing the reaction product to separate into an oil layer and a water layer and the precipitate to settle in the water layer (e) removing the water layer and filtering the precipitate from the water, (f) adding sufficient ammonium phosphate to the filtered water to produce an aqueous solution of ammonium phosphate having a concentration of about 2 to about 25 weight percent ammonium phosphate and recirculate through the preheater in (b), and (g) removing the oil.
Claim 13
Dependent Claim
55 words
A method according to claim 7 wherein said used motor oil also contains tetraethyllead, said method comprising: (a) obtaining a treated oil containing tetraethyllead by the method of claim 7, and (b) passing said treated oil through silica gel at a temperature above 350*F, thereby removing the tetraethyllead, and (c) recovering the further treated oil.
Claim 14
Dependent Claim
65 words
A method of claim 7 wherein said used motor oil also contains gasoline, said method comprising: (a) obtaining a treated oil by the method of claim 7, (b) flashing the oil-gasoline mixture to remove from the oil any gasoline and water that has been retained in the oil, (c) separating the water and gasoline, and (d) recovering the gasoline, oil, and water as separate products.
References Cited (Backward Citations)
US1747161A
Cited
US2271882A
Cited
US2842112A
Cited
US3282827A
Cited
US3489676A
Cited
US3791965A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-21 | 1978-10-21 | 1979-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-21 | 1982-10-21 | 1983-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-21 | 1986-10-21 | 1987-04-22 | $7700.00 | Window Closed / Lapsed |