Liquid purification or separation – Processes – Separating
Patent
1991-02-19
1992-05-19
Silverman, Stanley S.
Liquid purification or separation
Processes
Separating
210793, 210795, B01D 2446
Patent
active
051145952
ABSTRACT:
A method and apparatus for filtering a fluid through a particulate filter medium and for periodically scrubbing the particulate filter medium of accumulated contaminating material. During the filtration cycle, the particulate filter medium is retained with a filtration vessel by a bottom screen. During the scrubbing cycle, the particulate filter medium is retained within the filtration vessel by the bottom screen and a top screen. The combined surface area of the bottom screen and the top screen is substantially greater than the surface area of the bottom screen alone. During the scrubbing cycle, the particulate filter medium is fluidized with a scrubbing fluid and violently circulated to remove accumulated contaminating material from the filter medium, thereby suspending the contaminating material in the fluidized mixture. Meanwhile, the level of suspended contaminating material in the fluidized mixture is diluted by circulating a scrubbing fluid through the fluidized filter medium so that the contaminating material is removed through both the bottom screen and the top screen but the particulate filter medium is retained within the filtration vessel by the bottom screen and the top screen. The pressure differential across the bottom screen and the top screen during the scrubbing cycle is substantially reduced relative to the pressure differential across the bottom screen during a filtration cycle.
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Coyanosa Operations Company, Inc.
Nessler Cynthia L.
Silverman Stanley S.
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