US3919075A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for regenerating used lubricating oils
Assignee: IFP Energies nouvelles
•
Filing: 1974-04-09
•
Granted: 1975-11-11
•
Expires: 1994-04-09
Abstract
Abstract Used lubricating oils containing soluble metal compounds, particularly those recovered from internal combustion engines, gear-boxes and differentials, are regenerated by circulating them along a first face of a membrane permeable to hydrocarbons, preferably an ultra-filtration membrane, and collecting a purified oil on the other face of the membrane.
Inventors
- 👤 Guy Parc
- 👤 Maurice Born
- 👤 Alexandre Rojey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:40
CPC Classifications
C; C10; C10M; C10M175/00; C10M175/06
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
62 words
A PROCESS FOR REGENERATING A USED LUBRICATING OIL CONTAINING AT LEAST ONE SOLUBLE METAL COMPOUND OF LEAD, CALCIUM, BARIUM, MAGNESIUM, ZINC OR ALUMINUM, WHICH COMPRISES CIRCULATING SAID OIL ALONG A FIRST FACE OF AMEMBRANE PERMEABLE TO HYDROCARBONS AND COLLECTING A PURIFED OIL ON THE SECOND FACE OF THEMEMBRANE, SAID MEMBRANE HAVING A CUT ZONE IN THE RANGE OF FROM 5,000 TO 300,000.
Claim 2
Dependent Claim
62 words
A PROCESS FOR REGENERATING A USED LUBRICATING OIL CONTAINING AT LEAST ONE SOLUBLE METAL COMPOUND OF LEAD, CALCIUM, BARIUM, MAGNESIUM, ZINC OR ALUMINUM, WHICH COMPRISES CIRCULATING SAID OIL ALONG A FIRST FACE OF AMEMBRANE PERMEABLE TO HYDROCARBONS AND COLLECTING A PURIFED OIL ON THE SECOND FACE OF THEMEMBRANE, SAID MEMBRANE HAVING A CUT ZONE IN THE RANGE OF FROM 5,000 TO 300,000.
Claim 3
Dependent Claim
28 words
A process according to claim 1, wherein the pressure applied to the first face of the membrane is higher than the pressure applied to the second face thereof.
Claim 4
Dependent Claim
21 words
A process according to claim 1 wherein an extraction solvent is circulated in contact with the second face of the membrane.
Claim 5
Dependent Claim
24 words
A process according to claims 1, wherein the content of soluble metal compound of the oil is 0.1-10 % by weight, expressed as metal.
Claim 6
Dependent Claim
33 words
A process according to claim 1, wherein the soluble metal compounds comprise at least one of calcium, barium, magnesium, zinc or aluminum salicylates, sulfonates, phenates, phosphonates or thiophosphonates or the decomposition products thereof.
Claim 7
Dependent Claim
15 words
A process according to claim 1, wherein the soluble metal compound comprises a lead compound.
Claim 8
Dependent Claim
18 words
A process according to claim 1, wherein the oil contains viscosity index polymeric additives or their decomposition products.
Claim 9
Dependent Claim
20 words
A PROCESS ACCORDING TO CLAIM 1, WHEREIN THE PROCESS IS THAT OF ULTRAFILTRATION AND THE MEMBRANE IS AN ULTRAFILTRATION MEMBRANE.
Claim 10
Dependent Claim
25 words
A process according to calim 1, wherein the membrane is a membrane whose cut zone is in the range of from 10,000 to 100, 000.
Claim 11
Dependent Claim
25 words
A process according to calim 1, wherein the membrane is a membrane whose cut zone is in the range of from 10,000 to 100, 000.
Claim 12
Dependent Claim
79 words
A process according to claim 1, wherein the ultrafiltration membrane comprises a material selected from the group consisting of cellulose, cellulosic esters, polytetrafluorethylene, polychlorotrifluorethylene, crosslinked or vulcanized organopolysiloxanes, polypentaerythritol, sulfonated polystyrene, quaternary ammonium salts of dialkylamino polystyrene, the ionically cross-linked complex polyelectrolytes obtained from a polymer containing sulfonic groups and a polymer containing quaternary ammonium groups, sulfonated polyarylether sulfones, polyethylene, polypropylene, polymers of 2-chloro butadiene, butadienestyrene copolymers, vulcanized natural rubber, isopreneisobutene copolymers and copolymers of acrylonitrile with ionic monomers.
Claim 13
Dependent Claim
32 words
A process according to claim 1, wherein the used lubricating oil is filtered in the form of an oilsolvent mixture having an oil content of from 10 to 50 % by volume.
Claim 14
Dependent Claim
32 words
A process according to claim 1, wherein the used lubricating oil is filtered in the form of an oilsolvent mixture having an oil content of from 15 to 35 % by volume.
Claim 15
Dependent Claim
25 words
A process according to claim 1, wherein the oil is diluted with a solvent, said solvent being separated from the oil after treatment and recycled.
Claim 16
Dependent Claim
31 words
A process according to claim 1, wherein a portion of the oil of higher impurity content, when withdrawn from the filtration zone, is recycled to the inlet of the latter zone.
Claim 17
Dependent Claim
30 words
A process according to claim 1, wherein the oil or the mixture of oil and solvent is circulated along the membrane at a velocity of from 0.5 to 3 m/s.
Claim 18
Dependent Claim
22 words
A process according to claim 1, wherein the oil is circulated in the form of a layer of a 0.5-5 mm thickness.
Claim 19
Dependent Claim
19 words
A process according to claim 1, wherein a turbulence promoting grid is present in the path of the oil.
Claim 20
Dependent Claim
20 words
A process according to claim 1, wherein the pressures applied to each side of the membrane differ by 1-15 atmospheres.
Claim 21
Dependent Claim
16 words
A process according to claim 13, wherein the solvent is a hydrocarbon or a hydrocarbon mixture.
Claim 22
Dependent Claim
15 words
A process according to claim 19, wherein the hydrocarbon is propane, butane, pentane or hexane.
Claim 23
Dependent Claim
29 words
A process according to claim 13, wherein the process is operated in a plurality of serially arranged stages, the solvent being introduced fractionwise at the inlet of each stage.
Claim 24
Dependent Claim
61 words
A process according to claim 13, wherein the process is operated in a plurality of serially arranged stages, the oil fed at each stage being admixed with the filtration product of at least one following stage, the solvent being fed at the inlet of the last stage and the solution of regenerated oil consisting of the filtrate of the first stage.
Claim 25
Dependent Claim
54 words
A process according to claim 13, wherein the process is operated in two serially arranged stages, the charged oil being admixed with the filtration product from the second stage, the solvent being fed at the inlet of the second stage and the solution of regenerated oil consisting of the filtrate of the first stage.
Claim 26
Dependent Claim
32 words
A process according to claim 13, wherein the process is operated in a plurality of stages, each stage comprising several serially arranged filtration zones, each of them having its own recirculation circuit.
Claim 27
Dependent Claim
19 words
A process according to claim 3, wherein the extraction solvent is circulated in counter-current with respect to the oil.
Claim 28
Dependent Claim
13 words
A process according to claim 1 wherein the process is that of dialysis.
References Cited (Backward Citations)
US2367803A
Cited
US2341329A
Cited
US3228876A
Cited
US3105038A
Cited
US3819742A
Cited
US3821108A
Cited
US3785968A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-10 | 1979-05-12 | 1979-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-10 | 1983-05-12 | 1983-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-10 | 1987-05-12 | 1987-11-11 | $7700.00 | Window Closed / Lapsed |