Method and apparatus for enhancing the flux rate of cross-flow f

Details Method and apparatus for enhancing the flux rate of cross-flow f Method and apparatus for enhancing the flux rate of cross-flow f

1987-09-21

1991-09-10

Spear, Frank

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

210651, 21032169, B01D 6122

Patent

active

050471546

ABSTRACT:
A method of increasing the time-averaged cross-flow filtration flux of a liquid through a porous filter medium over the period of a filtration run, comprising the steps of: (a) flowing the liquid transversely through the filter medium by establishing a pressure differential across the filter medium; and (b) maintaining the filtration flux rate through the filter medium at a preselected substantially constant value during the entire filtration run by applying a variable throttling pressure on the filtrate side of the filter medium and reducing the throttling pressure during the run to control the instantaneous value of the pressure differential as required to maintain the preselected flux rate, such flux rate being greater than the equilibrium flux rate.
Also, a method of increasing the time averaged cross-flow filtration flux of a liquid through a porous filter medium, typically filter tubes, over the period of a filtration run, comprising the steps of flowing the liquid transversely through the filter medium by establishing a pressure differential across the filter medium, and commencing the filtration run by gradually increasing the flow rate over a sufficiently extended period of time to substantially prevent the intrusion of the particles of material being filtered out of the liquid into the filter medium per se.

REFERENCES:
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patent: 4435289 (1984-03-01), Breslau
patent: 4579662 (1986-04-01), Jonsson
patent: 4670150 (1987-06-01), Hsiung et al.
Chemical Engineering Progress, vol. 71, No. 12, Dec., 1975, pp. 74-80.
Chemical Engineering, vol. 87, No. 24, Dec. 1, 1980, European Search Report.

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