Process for the production of porous, permeable mineral membrane

Details Process for the production of porous, permeable mineral membrane Process for the production of porous, permeable mineral membrane

1985-12-26

1988-04-19

Lawrence, Evan K.

Coating processes

Foraminous product produced

Filter, sponge, or foam

427246, 427247, 427309, 427344, B05D 500

Patent

active

047388749

ABSTRACT:
The invention relates to a process for the production of porous, permeable, mineral membranes.
According to this process, on a porous, permeable substrate is formed a thin layer of at least one mineral compound chosen from among the simple or mixed metal oxides, except aluminum oxide and mixed aluminium oxides, simple or mixed metal hydroxides, except aluminium hydroxide and mixed aluminium hydroxides and mixtures thereof on the basis of a suspension in a liquid of colloidal or non-colloidal particles, said compound or a precursor thereof having particle sizes below 10 .mu.m. The suspension is kept in the finely divided state by the continuous application of energy to the reaction medium. The thus obtained membrane is dried and then annealed at a temperature between 400.degree. and 1100.degree. C.
The use of a suspension of ultrafine colloidal or non-colloidal particles makes it possible to obviate the compression stage and obtain microporous layers with very small pore radii.

REFERENCES:
patent: 3259585 (1966-07-01), Fitch et al.
patent: 3282857 (1966-11-01), Fitch et al.
patent: 3312630 (1967-04-01), Vanik et al.
patent: 3767453 (1973-10-01), Hoekstra
patent: 3773549 (1973-11-01), Elbert et al.
patent: 3926799 (1975-12-01), Thomas et al.

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