Patent US4834889A successfully refreshed from Google Patents.
US4834889A
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US
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Oil and water filter and process for dewatering oil sludge
Assignee: Oil Recovery Systems Inc
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Filing: 1987-01-05
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Granted: 1989-05-30
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Expires: 2007-01-05
Abstract
Abstract This disclosure concerns a composition and process for separating solids from an oil and water mixture. The composition comprises lime and calcined perlite of a size distribution such than 0-5% is retained on 30 mesh, 45-65% is retained on 50 mesh, 80-90% is retained on 100 mesh and 90-100% is retained on 200 mesh screens. The process is particularly applicable to separating solids from an oily sludge to produce a recoverable oil product and a non-leaching filter cake which is environmentally acceptable.
Inventors
- 👤 James W. Schleiffarth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:49
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/28; C02F1/281; C02F1/5236
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
79 words
A process of separating solids from oily sludge consisting essentially of the steps of (a) treating an oily sludge with lime, (b) treating the lime treated oily sludge with calcined perlite having a size distribution of about 0% to about 5% on 30 mesh, about 45% to about 65% on 50 mesh, about 80% to about 90% on 100 mesh and about 90% to about 100% on 200 mesh, and (c) separating the solids from the oil and water.
Claim 2
Dependent Claim
79 words
A process of separating solids from oily sludge consisting essentially of the steps of (a) treating an oily sludge with lime, (b) treating the lime treated oily sludge with calcined perlite having a size distribution of about 0% to about 5% on 30 mesh, about 45% to about 65% on 50 mesh, about 80% to about 90% on 100 mesh and about 90% to about 100% on 200 mesh, and (c) separating the solids from the oil and water.
Claim 3
Dependent Claim
34 words
The process of claim 1 wherein said separating includes passing the lime and calcined perlite treated sludge through a pre-coated recessed plate filter press at a pressure of about 75 to about 225 PSI.
Claim 4
Dependent Claim
36 words
The process of claim 2 wherein the calcined perlite is principally silicon dioxide and aluminum oxide of about 2.2 to about 2.4 specific gravity and a fusion point of about 2300° F. to about 2450° F.
Claim 5
Dependent Claim
13 words
The process of claim 2 wherein the press is pre-coated with diatomaceous earth.
Claim 6
Dependent Claim
20 words
The process of claim 1 wherein about 5 to about 30 pounds of lime per barrel of sludge is used.
Claim 7
Dependent Claim
16 words
The process of claim 5 wherein the lime is in the form of milk of lime.
Claim 8
Dependent Claim
27 words
The process of claim 1 wherein from about 5 to about 40 pounds of dry perlite aggregate per barrel of sludge is added to the limed sludge.
Claim 9
Dependent Claim
17 words
The process of claim 1 wherein the oily sludge is raised to a pH of about 11.
Claim 10
Dependent Claim
154 words
A process of separating solids from oily sludge consisting essentially of the steps of: (a) treating an oily sludge with milk of lime in an amount of about 5 to about 30 pounds of lime per barrel of sludge, (b) treating the lime treated oily sludge with calcined perlite in an amount of about 5 to about 40 pounds of dry perlite per barrel of sludge, said calcined perlite having a size distribution of about 0% to about 5% on 30 mesh, about 45% to about 65% on 50 mesh, about 80 to about 90% on 100 mesh, and about 90 to 100% on 200 mesh, said calcined perlite being principally silicon dioxide and aluminum oxide of about 2.2 to about 2.4 specific gravity and having a fusion point of about 2300° F. to about 2450° F., (c) separating the solids from the oil and water, and (d) separating the oil from the water.
Claim 11
Dependent Claim
154 words
A process of separating solids from oily sludge consisting essentially of the steps of: (a) treating an oily sludge with milk of lime in an amount of about 5 to about 30 pounds of lime per barrel of sludge, (b) treating the lime treated oily sludge with calcined perlite in an amount of about 5 to about 40 pounds of dry perlite per barrel of sludge, said calcined perlite having a size distribution of about 0% to about 5% on 30 mesh, about 45% to about 65% on 50 mesh, about 80 to about 90% on 100 mesh, and about 90 to 100% on 200 mesh, said calcined perlite being principally silicon dioxide and aluminum oxide of about 2.2 to about 2.4 specific gravity and having a fusion point of about 2300° F. to about 2450° F., (c) separating the solids from the oil and water, and (d) separating the oil from the water.
Claim 12
Dependent Claim
48 words
The process of claim 9 wherein said separating the solids includes passing the lime and calcined perlite treated sludge through a recessed plate filter press pre-coated with diatomaceous earth at a pressure of about 75 to about 225 PSI, and the oil and water are in the filtrate.
Claim 13
Dependent Claim
73 words
A process of separating solids from oily sludge consisting essentially of the steps of (a) treating an oily sludge concurrently with lime, and calcined perlite having a size distribution of about 0% to about 5% on 30 mesh, about 45% to about 65% on 50 mesh, about 80% to about 90% on 100 mesh and about 90% to about 100% on 200 mesh, and (b) separating the solids from the oil and water.
Claim 14
Dependent Claim
73 words
A process of separating solids from oily sludge consisting essentially of the steps of (a) treating an oily sludge concurrently with lime, and calcined perlite having a size distribution of about 0% to about 5% on 30 mesh, about 45% to about 65% on 50 mesh, about 80% to about 90% on 100 mesh and about 90% to about 100% on 200 mesh, and (b) separating the solids from the oil and water.
References Cited (Backward Citations)
US2665813A
Cited
US3835021A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-05-29 | 1992-11-28 | 1993-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-29 | 1996-11-28 | 1997-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-29 | 2000-11-28 | 2001-05-30 | $7700.00 | Window Closed / Lapsed |