Linear polyurethane ultrafilter and processes for use thereof

Details Linear polyurethane ultrafilter and processes for use thereof Linear polyurethane ultrafilter and processes for use thereof

1980-04-30

1982-06-01

Hart, Charles N.

Liquid purification or separation

Processes

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

210708, 210799, 2105002, B01D 1300, B01D 3916

Patent

active

043326862

ABSTRACT:
An ultrafiltration membrane comprised of a linear polyurethane having a hydraulic permeability for water of about 50 to 500 1/m.sup.2 .multidot. h and a separation factor .alpha. of about 2.times.10.sup.-3 to 1.times.10.sup.-4, the permeability being based on determination with a membrane of a thickness of about 0.02 mm, a pressure differential of 1 bar and a temperature of 20.degree. C. and the separation factor .alpha. being established with a 2% oil-water emulsion at 25.degree. C. The membrane is particularly suited for operation of oil-water mixtures or emulsions.

REFERENCES:
patent: 3615024 (1971-10-01), Michaels
patent: 3855133 (1974-12-01), Roehsler
patent: 4042576 (1977-08-01), Eustache
patent: 4148734 (1979-04-01), Hilterhaus et al.
Berger, S. E. et al., "High-Performance Toluene Diisocyanate-Polypropylene Glycol . . . ", Itec Product Research and Development 3,129 (1964).
Muir, W. M. et al., "Comparative Membrane Ultrafiltration Rates", Med. and Biol. Engng., vol. 8, pp. 395-402, Pergamon Press, 1970.
Mason, N. S. et al., "Cellulose Acetate Dialysis Membranes" in Advances in Bioengineering, No. 114, vol. 67, 1971, Am. Inst. of Chem. Engineers.

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