Liquid purification or separation – Processes – Separating
Patent
1995-05-04
1997-04-08
Popovics, Robert J.
Liquid purification or separation
Processes
Separating
210791, 210805, 210188, 210194, 210197, 2103232, 210332, 210409, 2104161, 210456, 162 3011, B01D 3700, B01D 2900
Patent
active
056184433
ABSTRACT:
A filtering method and apparatus pass the suspension (e.g. green liquor) to be filtered in a falling film down a first side of a filtering surface of a filter element at a different (higher) pressure than a second side, so that due to the pressure difference prevailing across the filtering surface the filtrate flows through the filtering surface and separated solids substantially remain in the suspension, without forming an undesirable solids layer on the filtering surface. A uniform liquid film falling on the filtering surface is generated by recirculating suspension from the bottom of the filter housing to an upper portion of the filter element. Nozzles may direct flow toward the filtering surface in localized areas. The method may be practiced continuously or in batches.
REFERENCES:
patent: 3696933 (1972-10-01), Pall et al.
patent: 3835999 (1974-09-01), Moore
patent: 5008009 (1991-04-01), Ciaffoni
Engdahl et al, "Clarification of Green Liquor by a Falling Film . . .", Paper and Timber vol. 76/No. 5/1994, pp. 326-329, May 24, 1994.
Engdahl Holger
Tormikoski Pekka
Ahlstrom Machinery Oy
Popovics Robert J.
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