US3592341A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for steam drying filter cake
Assignee: Envirotech Corp
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Filing: 1970-01-05
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Granted: 1971-07-13
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Expires: 1990-01-05
Abstract
Abstract A method and apparatus is disclosed for steam-drying filter cake formed on a drum on disc-type vacuum filter which is mounted for rotation in an enclosed feed slurry tank. To block heat loss and subsequent condensation of the steam within the enclosed area, an insulating barrier is floated on the feed slurry to maintain a thermal separation therebetween.
Inventors
- 👤 Robert C Emmett Jr
- 👤 Donald A Dahlstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:45
CPC Classifications
B; B01; B01D; B01D33/00; B01D33/15; B01D33/21; B01D33/44; B01D33/46; B01D33/466; B01D33/58; B01D33/62; B01D33/66; B01D33/663; B01D33/68; B01D33/70; B01D33/76; B01D33/80; B01D33/804; B01D33/807; B01D35/00; B01D35/18; B01D35/30; B01D2201/00; B01D2201/38
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
15 words
Method according to claim 1 wherein said insulating material comprises a material containing trapped air.
Claim 2
Dependent Claim
11 words
Method according to claim 2 wherein said insulating material is foam.
Claim 3
Dependent Claim
17 words
Method according to claim 1 wherein said insulating material comprises a flotatable material having a low-heat conductivity.
Claim 4
Dependent Claim
15 words
Method according to claim 4 wherein said flotatable material comprises a layer of polymeric particles.
Claim 5
Dependent Claim
121 words
In a pressure differential filter of the type having a tank for holding a feed material to be filtered, means for introducing the feed material into said tank, a filter element mounted for rotation in said tank, means for rotating said filter element into and out of said feed material, a cover over said tank forming an enclosure therewith, and means for introducing a heated gaseous fluid into said enclosure; the improvement comprising means for maintaining the upper surface of the feed material at a substantially constant elevation, and means for maintaining a layer of flotatable, insulating material on the surface of said feed material to maintain a thermal separation between the feed material and the fluid introduced into said enclosure.
Claim 6
Dependent Claim
65 words
Apparatus according to claim 6, in which said means for maintaining a layer of flotatable insulating material includes a baffle extending from below the elevation of said upper surface of feed material to above said elevation and an overflow means to maintain the upper surface of feed material at said substantially constant elevation, said baffle extending vertically between elevations above and below said overflow means.
Claim 7
Dependent Claim
61 words
Apparatus according to claim 6, wherein the means for maintaining said upper surface of feed material at a substantially constant elevation and for maintaining said layer of flotatable insulating material thereon includes a sidewall extending above the feed material and a conduit having one end extending through said wall into said tank at an elevation below the top of said sidewall.
Claim 8
Dependent Claim
58 words
In an enclosed system for drying a filter cake formed on a rotary vacuum filter having a lower cake forming zone in which the filter cake is formed and an upper drying zone containing steam for passage through the filter cake, the improvement comprising a flotatable thermal barrier positioned between the cake forming zone and the drying zone.
Claim 9
Dependent Claim
18 words
The system of claim 9 wherein the flotatable thermal barrier comprises an insulating material formed with included air.
Claim 10
Dependent Claim
16 words
The system of claim 10 wherein the insulating material is foam generated by the liquid feed.
Claim 11
Dependent Claim
17 words
The system of claim 10 wherein the thermal barrier comprises a polymeric material having a low-heat conductivity.
References Cited (Backward Citations)
US3361259A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |