Liquid purification or separation – With alarm – indicator – register – recorder – signal or... – Fluid pressure responsive
Patent
1989-09-20
1991-09-03
Jones, W. Gary
Liquid purification or separation
With alarm, indicator, register, recorder, signal or...
Fluid pressure responsive
210 97, 210138, 210143, 210225, 210227, 210230, 100112, 100113, 100198, B01D 2512, B01D 25172, B01D 2532
Patent
active
050451863
ABSTRACT:
A filtration method includes steps of feeding liquid to be filtered into a filter medium between a fixed plate and a movable plate; and reducing capacity of a filter chamber formed by the medium by moving the movable plate in a direction in which the movable plate presses the fixed plate through the medium so as to perform expressing filtration of the liquid and to produce cake. The reducing step comprises alternately repeating at least one time an expressing pressure-increasing process for increasing pressure in the liquid in the medium by a specified increment in the filtration of the liquid, and an expressing pressure-maintaining process for maintaining the pressure constant during a specified period, so that the filtration is performed under a specified pressure corresponding to a desired water content of the cake to produce the cake. A filter press for employing the method has the filter medium arranged between the fixed plate and the movable plate capable of moving toward and away from the fixed plate. The press comprises a driving device for driving the movable plate to move toward and away from the fixed plate; a pressure sensor arranged at one of the movable plate and the fixed plate and measuring pressure in the chamber; and a control unit for controlling the expressing filtration of the liquid by control of drive of the driving device on the basis of a signal outputted from the sensor.
REFERENCES:
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patent: 4861494 (1989-08-01), Bratten
patent: 4874512 (1989-10-01), Brown
patent: 4892665 (1990-01-01), Wettlaufer
Jones W. Gary
Kurita Machinery Manufacturing Company Limited
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