Process for making alkali resistant hyperfiltration membrane and

Details Process for making alkali resistant hyperfiltration membrane and Process for making alkali resistant hyperfiltration membrane and

1987-01-08

1989-05-30

Lawrence, Evan

Liquid purification or separation

Filter

Supported, shaped or superimposed formed mediums

21050036, 21050037, 21050038, 21050042, 427244, 427245, 427253, B01D 1300, B05D 500

Patent

active

048348864

ABSTRACT:
A novel hyperfiltration membrane and process for making the same is described. The membrane is useful for processing copper electroless solutions to concentrate for re-use salts of chelating agents. The membrane can be prepared by crosslinking a water-compatible polymer in the presence of a phosphorus-containing acid, such as phosphoric acid, wherein the acid is present in a sufficient amount to catalyze crosslinking and to form a plurality of pores in the coating when dried.

REFERENCES:
patent: 3852388 (1974-12-01), Kimura
patent: 3926798 (1975-12-01), Cadotte
patent: 4073733 (1978-02-01), Yamauchi et al.
patent: 4279752 (1981-07-01), Sueoka et al.
patent: 4366062 (1982-12-01), Kurihara et al.
patent: 4559139 (1985-12-01), Uemura et al.
patent: 4609468 (1986-09-01), Cramm
patent: 4634531 (1987-01-01), Nakagawa et al.

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