Method for improving the separating action in the ultrafiltratio

Details Method for improving the separating action in the ultrafiltratio Method for improving the separating action in the ultrafiltratio

1981-07-31

1985-09-03

Sadowski, David

Liquid purification or separation

Processes

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

210651, B01D 1300

Patent

active

045391173

ABSTRACT:
A method for improving the separating action in the ultrafiltration of aqueous solutions containing high-molecular-weight organic compounds including water-soluble anionic and/or non-ionic surface-active compounds consisting essentially of subjecting an aqueous solution containing high-molecular-weight organic compounds including water-soluble anionic and/or non-ionic surface-active compounds to an ultrafiltration through a porous membrane in the presence of olefinically-unsaturated C.sub.16-22 fatty acids or water-soluble salts thereof, in a weight ratio of surface-active compound to fatty acid or salt of from 20:1 to 1:1 and recovering said aqueous solution substantially separated from said high-molecular-weight organic compounds. The retention power for water-soluble tensides can be 0.9 or more with this measure (without the addition, .ltoreq.0.1 to 0.5). Furthermore oil can be removed to a mineral oil content of 20 mg/l, whereas without the addition of the invention, values of more than 100 mg/l in the permeate are obtained.

REFERENCES:
patent: 4086164 (1978-04-01), Noda et al.
Lacey, Robert E. et al., Industrial Processing with Membranes, Wiley-Interscience, N.Y., 1972, p. 160.

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