Process for preparing liquophilic polyamide membrane filter medi

Details Process for preparing liquophilic polyamide membrane filter medi Process for preparing liquophilic polyamide membrane filter medi

1980-10-20

1982-07-20

Spear, Jr., Frank A.

Liquid purification or separation

Filter

Supported, shaped or superimposed formed mediums

2104935, 21049701, 2105002, 264 41, B01D 3100

Patent

active

043404804

ABSTRACT:
A process is provided for preparing skinless liquophilic alcohol-insoluble polyamide membranes by preparing at a first temperature a solution in a polyamide solvent having a temperature coefficient of solubility within the range from about 0.01 to about 5 weight percent per degree Centigrade of an alcohol-insoluble polyamide resin having a ratio CH.sub.2 :NHCO of methylene CH.sub.2 to amide NHCO groups within the range from about 7:1 to about 12:1; inducing nucleation of the solution by controlled addition to the solution of a nonsolvent for the polyamide resin, under controlled conditions of concentration, temperature, addition rate, and degree of agitation to obtain a visible precipitate of polyamide resin particles which may or may not thereafter partially or completely redissolve, thereby forming a casting solution; spreading the casting solution on a substrate to form a thin film thereof on the substrate; cooling the film of casting solution to a second temperature sufficiently lower than the first temperature to precipitate polyamide resin from the casting solution; contacting and diluting the film of casting solution with a nonsolvent liquid, preferably containing a substantial proportion of the solvent liquid but less than the proportion in the casting solution, to precipitate polyamide resin from the casting solution in the form of a thin skinless liquophilic membrane; and washing and drying the resulting membrane.

REFERENCES:
patent: 2783894 (1957-03-01), Lovell et al.
patent: 3389206 (1968-06-01), Jamison
patent: 3457339 (1969-07-01), Pall et al.
patent: 3524753 (1970-08-01), Sharp
patent: 3876738 (1975-04-01), Marinaccio et al.
patent: 3894166 (1975-07-01), Brown et al.

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