US4217700A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for drying filtration residue
Assignee: Dr Mueller AG
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Filing: 1978-12-04
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Granted: 1980-08-19
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Expires: 1998-12-04
Abstract
Abstract A process for drying solid residues obtained in filtration processes, in which the residue is first dried by passing a gas through it while it is still on the filter elements, and then whirl drying the residue in a lower portion of the reaction vessel. A system in which the drying gas is circulated is described. This results in a process which permits the preparation of dry filter residues which are easily transportable and avoids problems of separation from the filter elements while still wet.
Inventors
- 👤 Hans Muller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:35
CPC Classifications
F; F26; F26B; F26B3/00; F26B3/02; F26B3/06; B; B01; B01D; B01D29/00; B01D29/11; B01D29/114; B01D29/50; B01D29/52; B01D29/76; B01D29/80; B01D29/84; B01D29/843; B01D35/00; B01D35/16; B01D2201/00; B01D2201/04; B01D2201/0469; B01D2201/0484
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
148 words
A process for drying wet filter residue in a filter comprising a filtration vessel, at least one vertical filter element which receives said residue during filtration, an inlet and an outlet for a substance to be filtered and a duct in a lower portion of said filtration vessel to introduce a drying gas into said filtration vessel, the process including: passing the drying gas introduced into said vessel after the filtration is completed through said filter element in a direction of filtration to dry said residue, mechanically removing said dried residue from said filter element by gas inserted into said vessel and flowing in a downward direction whereby said dried residue is collected in said lower portion of said vessel; and introducing a drying gas into said lower portion of said vessel whereby the residue collected in said lower portion of said vessel is whirled up and dried.
Claim 2
Dependent Claim
148 words
A process for drying wet filter residue in a filter comprising a filtration vessel, at least one vertical filter element which receives said residue during filtration, an inlet and an outlet for a substance to be filtered and a duct in a lower portion of said filtration vessel to introduce a drying gas into said filtration vessel, the process including: passing the drying gas introduced into said vessel after the filtration is completed through said filter element in a direction of filtration to dry said residue, mechanically removing said dried residue from said filter element by gas inserted into said vessel and flowing in a downward direction whereby said dried residue is collected in said lower portion of said vessel; and introducing a drying gas into said lower portion of said vessel whereby the residue collected in said lower portion of said vessel is whirled up and dried.
Claim 3
Dependent Claim
18 words
A process as defined in claim 1, wherein said drying gas is air or a chemically inert gas.
Claim 4
Dependent Claim
20 words
A process as defined in claim 1, wherein said drying gas is dried prior to use by a condensation process.
Claim 5
Dependent Claim
20 words
A process as defined in claim 1, wherein said drying gas is dried prior to use by an absorption process.
Claim 6
Dependent Claim
25 words
A process as defined in claim 1, wherein said drying gas is warmed prior to introducing into said filtration vessel by means of heat exchanger.
Claim 7
Dependent Claim
24 words
A process as defined in claim 5, wherein said drying gas is circulated through a system comprising said filtration vessel and said heat exchanger.
Claim 8
Dependent Claim
22 words
A process as defined in claim 6, wherein said drying gas is circulated out of said filtration vessel through said filter elements.
Claim 9
Dependent Claim
36 words
A process as defined in claim 1, wherein said drying gas is separated into streams after introduction of said gas into said lower portion of said filtration vessel by means of a sieve or perforated plate.
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) | 1983-08-19 | 1984-02-18 | 1984-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-19 | 1988-02-18 | 1988-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-19 | 1992-02-18 | 1992-08-19 | $7700.00 | Window Closed / Lapsed |