Membrane purification of solutions/suspensions of polyphosphazen

Details Membrane purification of solutions/suspensions of polyphosphazen Membrane purification of solutions/suspensions of polyphosphazen

1991-02-13

1992-03-24

Dawson, Robert A.

Liquid purification or separation

Processes

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

210653, 210654, 525538, 528167, 528168, B01D 6100

Patent

active

050985744

ABSTRACT:
Impure solutions or suspensions of the polyphosphazenes, e.g., those containing the reagents and/or byproducts of the chloro-substitution of a polydichlorophosphazene, are purified by contacting such impure solutions/suspension with a semipermeable membrane having a cutoff threshold corresponding to the impurities sought to be removed, and filtering such impurities therethrough, e.g., by establishing a trans-membrane pressure gradient.

REFERENCES:
patent: 4289862 (1981-09-01), Hornbaker et al.
patent: 4514550 (1985-04-01), Penton
patent: 4558103 (1985-12-01), Hergenrother et al.
patent: 4656246 (1987-04-01), Chang et al.
patent: 4663420 (1987-05-01), Chang
patent: 4880905 (1989-11-01), Ueyama et al.
patent: 4889910 (1989-12-01), Bordere et al.
patent: 5001203 (1991-03-01), DePoortere et al.

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