Anisotropic phenolic polyether membrane

Details Anisotropic phenolic polyether membrane Anisotropic phenolic polyether membrane

1974-02-22

1978-02-14

Spear, Jr., Frank A.

Liquid purification or separation

With alarm, indicator, register, recorder, signal or...

Responsive to fluid flow

260 22R, 210500M, B01D 3100

Patent

active

040737241

ABSTRACT:
Anisotropic membranes particularly useful in reverse osmosis because of their good salt rejection properties and high transmission rate are provided which consist essentially of a polymer comprising a plurality of units of the formula ##STR1## in which each of the symbols Q, Q' and Q", which can be identical or different, represents a hydrogen atom, an alkyl radical with 1 to 4 carbon atoms or a --SO.sub.3 H radical, the number of --SO.sub.3 H radicals in the polymer being such that the ionic capacity of the polymer is from about 0.5 to about 5 meg/g, in the form of a layer which exhibits a degree of salt rejection, said layer having an equivalent thickness of from about 0.01 to about 5.mu. , and a highly porous support layer, of thickness up to about 1 mm.

REFERENCES:
patent: 3259592 (1966-07-01), Fox et al.
patent: 3615024 (1971-10-01), Michaels
patent: 3709774 (1973-01-01), Kimura
patent: 3754375 (1973-08-01), Bouchilloux et al.

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