Dry, particulate, inorganic ultrafiltration membranes and the pr

Details Dry, particulate, inorganic ultrafiltration membranes and the pr Dry, particulate, inorganic ultrafiltration membranes and the pr

1981-04-15

1983-11-01

Spear, Jr., Frank A.

Liquid purification or separation

Filter

Material

427245, B01D 3100

Patent

active

044129211

ABSTRACT:
A coating is applied to a microporous support in the presence of a volatile liquid capable of drawing the coating into the support and of desolvating the coating. The liquid is thereafter volatilized with the resulting dry ultrafiltration membrane being essentially crack-free and having desirable mechanical and chemical stability. The support may be pretreated with a volatile liquid, such as acetone, prior to the applying of the coating to the support. Alternately, the coating material can be dispersed in a volatile liquid, such as methanol, to form a coating suspension that is applied to the support. The coating material, preferably zirconia, will have a particle size within the range of from about 5 m.mu. to about 10.mu., with the coating having a thickness of up to about 20.mu.. The support, such as a porous carbon tube, will have a pore volume of about 5-60% and a pore size of about 5 m.mu.-40.mu.. Stability is enhanced by firing the membrane at 25.degree. C.-1500.degree. C. preferably at about 400.degree. C.-600.degree. C.

REFERENCES:
patent: 3238056 (1966-03-01), Pall et al.
patent: 3497394 (1970-02-01), Berger
patent: 3926799 (1975-12-01), Thomas et al.
patent: 3977967 (1976-08-01), Trulson et al.
Chemical Abstracts, vol. 66, 1967, p. 4632, Item 49,470 e, "Semipermeable Inorganic Bodies".

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