Rectifying dialyzer, bioreactor and membrane

Details Rectifying dialyzer, bioreactor and membrane Rectifying dialyzer, bioreactor and membrane

1994-06-13

1996-06-18

Spear, Frank

Liquid purification or separation

Processes

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

21050023, B01D 6128

Patent

active

055274676

ABSTRACT:
The invention provides dual-skinned membranes useful as one way or rectifying membranes which reduce back filtration of solute molecules in dialysis and which improve nutrient supply and product recovery in membrane bioreactors. The membranes are dual-skinned polymeric materials preferably in the form of hollow fibers. The membranes have skins of polymer on the opposite sides with differing permeability to solutes and sieving coefficient characteristics. The skin on each side have pores that are invisible at 10,000 times magnification, the microporous structure between said skins contains pores capable of retaining solutes in a molecular weight range of about 5000 to 200000 in an increased concentration between the interior and the exterior skins. Improved dialysis devices are formed by using bundles of the hollow fiber membranes as a dialysis means having rectifying properties.

REFERENCES:
patent: 4481260 (1984-11-01), Nohmi
patent: 4804628 (1989-02-01), Cracauer et al.
patent: 5049276 (1991-09-01), Saraki
patent: 5240614 (1993-08-01), Ofsthun et al.
Patent Abstracts of Japan vol. 12 No. 270 (C-515)[3117] Jul. 27, 1988.

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