Liquid purification or separation – Processes – Including controlling process in response to a sensed condition
Patent
1992-09-08
1993-08-17
Drodge, Joseph W.
Liquid purification or separation
Processes
Including controlling process in response to a sensed condition
210143, 210193, 210744, 210778, B01D 3702
Patent
active
052366014
ABSTRACT:
An automated computer protocol is disclosed for the dispensing rate of a filter aid slurry into a pressure or vacuum filter in order to efficiently use filter aid and disposable filter septum. The control system accepts three input variables; these variables are total time of filter use, differential pressure across the filter media and the volume (level) in the (slurry or filter aid) bodyfeed tank for augmenting the filter performance. In the disclosed protocol, these variables are processed in turn to vary the rate in which bodyfeed will be introduced into the filter. Specifically, and on an adjustable incremental basis, the pressure differential is monitored across the filter. This differential is compared to that differential which would exist if the filter had reached the end of service life "set point"--which requires septum replacement and cleaning. The total quantity of bodyfeed available and the rate at which bodyfeed is being added to the filter are monitored. An extrapolation of successive filter differential pressure against time is used to plot the slope of the pressure differential curve and predict operating time to the filter set point based on discrete selected operating intervals including a given number of sample points. This is in turn used to control the bodyfeed rate to the filter. These disclosed controls result in the filter reaching its terminal set point pressure at over the greatest possible time interval.
REFERENCES:
patent: 489084 (1893-01-01), Morgan
patent: 2971648 (1961-02-01), Lane et al.
patent: 3348685 (1967-10-01), Miller
patent: 4118778 (1978-10-01), Strub
patent: 4514306 (1985-04-01), Pato
Harris Stephen G.
Snell Darrell E.
Drodge Joseph W.
J. R. Schneider Co. Inc.
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