Porous, semipermeable membranes of chemically modified cellulose

Details Porous, semipermeable membranes of chemically modified cellulose Porous, semipermeable membranes of chemically modified cellulose

1983-11-23

1986-08-05

Sadowski, David

Liquid purification or separation

Filter

Supported, shaped or superimposed formed mediums

2105002, 210506, 21050030, B01D 1304

Patent

active

046042040

ABSTRACT:
Cellulose acetate containing membranes which have pore diameters of about 10 to 1000 .ANG. are modified by reacting these membranes (a) with (b) an at least difunctional compound, e.g. cyanuric chloride, (c) a polyfunctional oligomer or polymer, e.g. polyethyleneimine, and then with (d) a compound which contains at least one ionic group and one group capable of reaction with component (c). Reactant (d) is necessary only if the polyfunctional component (c) does not already contain sufficient ionic groups.
The novel membranes are suitable for ultrafiltration and can be used for example for separating monovalent ions of low ionic weight from polyvalent ions of low or relatively high ionic weight of from monovalent ions of relatively high ionic weight and for separating ionic compounds (salts) from non-ionic (organic) 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.

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patent: 4239545 (1980-12-01), Uemura et al.
patent: 4250029 (1981-02-01), Kiser et al.
Hoffer, Erica et al., "Ion Separation by Hyperfiltration . . . ", Ind. Eng. Chem. Process Des. Develop., vol. 11, No. 2, 1972 pp. 226-228.

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