Reverse osmosis of ultrafiltration modified polyacrylonitrile-co

Details Reverse osmosis of ultrafiltration modified polyacrylonitrile-co Reverse osmosis of ultrafiltration modified polyacrylonitrile-co

1982-11-30

1986-04-22

Sadowski, David

Liquid purification or separation

Processes

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

210654, 2105002, 210506, B01D 1300, B01D 1304

Patent

active

045841039

ABSTRACT:
Modified, polyacrylonitrile-containing membranes suitable for ultrafiltration are prepared by reacting polyacrylonitrile or copolymers of acrylonitrile and other ethylenically unsaturated monomers with, successively, hydroxylamine, at least difunctional compounds, which act as bridge members, e.g. cyanuric chloride, a polyfunctional oligomer or polymer, e.g. polyethyleneimine, and, finally, a reactive compound containing at least one ionic group, e.g. an anionic reactive azo dye. The latter compound must be able to react with the polyfunctional oligomer or polymer and is required only if the said polymer does not already itself contain ionic groups.
The novel membranes show good mechanical, temperature and pH-stabilities and are suitable, for example, for separating monovalent ions of low ionic weight from polyvalent ions of low or relatively high ionic weight or from monovalent ions of relatively high ionic weight and for separating ionic compounds from non-ionic compounds or from ionic compounds which have a different molecular weight or opposite charge. They can be used for example for separating salts from organic compounds (dyes) or in waste-water treatment.

REFERENCES:
patent: 3228877 (1966-01-01), Mahon
patent: 4142020 (1979-02-01), Okamura et al.
patent: 4148734 (1979-04-01), Hilterhaus et al.
patent: 4177150 (1979-12-01), Inoue et al.
patent: 4259183 (1981-03-01), Cadotte
Chemical Abstracts, vol. 83, 1975, p. 55, Abstract No. 207279g, Kamata et al., "Chelate Semipermeable Membranes".
Chemical Abstracts, vol. 83, 1975, Abstract No. 11675p, Kamata et al, "Semipermeable Membrane".
Patent Office Academy Notebook, Topic 7d, Formality Term List, Session No. 38, Oct. 1977, two pages.

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