Process for the production of highly permeable calcined diatomit

Details Process for the production of highly permeable calcined diatomit Process for the production of highly permeable calcined diatomit

1991-06-07

1993-01-12

McFarlane, Anthony

Catalyst, solid sorbent, or support therefor: product or process

Solid sorbent

Silicon containing

423326, B01J 2014

Patent

active

051790629

ABSTRACT:
A process for the production of calcined diatomaceous filtration agents having a cristobalite content lower than 1% and a 50-.mu.m screen retention rate lower than 5% by rapid calcination of diatomites, comprising injecting the diatomite into a high-temperature gaseous stream and during its residence in the gaseous stream maintaining the diatomite between about 1250.degree. and 850.degree. C. for a period of time between several tens of milliseconds and several seconds, and calcined diatomaceous filtration agents having a permeability between 0.06 and 0.4 darcy and a cristobalite content lower than 1%.

REFERENCES:
patent: 1862825 (1932-06-01), Laury
patent: 1985526 (1934-12-01), Stockton
patent: 2470346 (1949-05-01), Frankenhoff
patent: 3012981 (1961-12-01), Riede
patent: 3993499 (1976-11-01), Jacobson et al.
patent: 4112129 (1978-09-01), Duensing et al.
patent: 4325844 (1982-04-01), Olmsted, Jr.
patent: 5073178 (1991-12-01), Mimoki et al.

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