Liquid purification or separation – Filter – Material
Patent
1981-08-25
1985-04-09
Wyse, Thomas
Liquid purification or separation
Filter
Material
B01D 3904
Patent
active
045100551
ABSTRACT:
This invention provides a non-fibrous combustible filter aid for vacuum pre-coat filter units which is effective to maintain a filter bed coating on rotary filter drums just sufficiently porous to pass the liquid of a slurry while retaining the slurry solids thereon and is capable of being scraped off the bed in thin film form with the slurry solids thereon. The filter aid comprises relatively non-compressible non-fibrous granular charcoal or nut shell particles having a dry bulk density from about 0.3 to about 0.6 grams per cubic centimeter, a particle density of about 1.4 to 1.7 grams per cubic centimeter and a particle size range of 30 to 125 microns. The filter aid of this invention is capable of being burned with the solids deposited thereon to recover the heat value thereof or to dispose of the solids, is free from silicates or other non-combustible ingredients, and is devoid of fibers which will interfere with the proper operation of the filter unit.
REFERENCES:
patent: 3635341 (1972-01-01), Davis
patent: 3780861 (1973-12-01), Hirs
patent: 3870632 (1975-03-01), Erskine
patent: 3900395 (1975-08-01), Hirs
patent: 4197205 (1980-04-01), Hirs
patent: 4238334 (1980-12-01), Halbfoster
patent: 4315824 (1982-02-01), Kalolkiewicz et al.
Johns-Manville, "Celite Filter Aids", Brochure FA-84A-RWC.
Eagle-Picher Celatom "Diatomite Filter Aids", Brochure A-500.
Grefco, Inc. "Diacalite Perlite Filter Aid", Technical Bulletin P-11-E.
Eagle Picher, "Pre-co-Floc", Cellulose Fiber Filter Aids Provide Superior Performance, Bulletin, Form C-100.
Johns-Manville, "Celite", Technical Data Sheet FF-238A.
Alar Engineering Corporation
Wyse Thomas
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