Gas separation – Two or more separators – Plies or layers of different characteristics or orientation
Patent
1988-01-05
1989-03-07
Nozick, Bernard
Gas separation
Two or more separators
Plies or layers of different characteristics or orientation
55523, B01D 4600
Patent
active
048102733
ABSTRACT:
A porous ceramic filter consisting of a planar porous support formed of a ceramic material, and a filtering layer formed of a fired mass of a ceramic powder integrally deposited on an upper surface of the porous ceramic support. A particle size of the ceramic powder, and a size of macro pores formed in the fired mass of said ceramic powder, decrease substantially continuously in a direction from the upper surface of the ceramic support toward an exposed surface of the filtering layer. The porous ceramic filter is produced by a process including preparing a suspension containing a ceramic powder of a predetermined particle size distribution; holding the porous support stationary such that the upper surface extends substantially horizontally, and is in contact with the suspension, until particles of the ceramic powder are sedimented by gravity and thereby deposited on the upper surface of the porous support, as an unfired layer for the filtering layer; removing aqueous components from said porous ceramic support and the unfired layer of the deposited particles; and firing the porous ceramic support and the unfired layer to produce the porous ceramic layer.
REFERENCES:
patent: 4356215 (1982-10-01), Auriol et al.
patent: 4629483 (1986-12-01), Stanton
NGK Insulators Ltd.
Nozick Bernard
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