Chemistry of inorganic compounds – Oxygen or compound thereof – Metal containing
Patent
1974-03-19
1976-04-13
Carter, Herbert T.
Chemistry of inorganic compounds
Oxygen or compound thereof
Metal containing
423628, 423625, 432 18, C01F 702
Patent
active
039505073
ABSTRACT:
The invention relates to a method for producing granulated porous corundum having a homogeneous porous structure with a total pore volume of 0.3 to 1.0 cm.sup.3 /g and predominant pore size of 5000 to 30000 A. The method comprises subjecting the granules of active alumina or aluminum hydroxide having a porous structure with a total pore volume of 0.3 to 1.0 cm.sup.3 /g and pore size of 20 to 5000 A to heat treatment by increasing the temperature from 20.degree.C to 700.degree.C during a period of at least 0.5 hour, thereafter the granules are heat treated at a temperature range of from 700.degree.C to 1000.degree.C for at least 0.5 hour, and then at a temperature range of from 1000.degree.C to 1400.degree.C for at least 0.5 hour, the heat treatment in the temperature range of from 20.degree.C to 1000.degree.C being carried out in an atmosphere of hydrogen fluoride which is present in amounts of from 0.01 to 2.0 percent of the weight of active alumina. The method of the invention can be effected by carrying out the heat treatment either in a stationary mode, or by a combination of stationary and continuous modes, or in a purely continuous mode. The method permits the use of initial granules of active alumina or aluminum hydroxide having any pore size distribution within the above-specified range; it also prevents the sintering of initial granules when heat treated, thus preventing any decrease in the total pore volume and linear dimensions of the granules and yields a granulated porous corundum having high mechanical strength (crushing strength of up to 160 kg/cm.sup.2). The method requires no sophisticated technology or equipment.
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Badaev Boris Nikolaevich
Balashov Vladimir Alexandrovich
Boreskov Georgy Konstantinovich
Kuklina Valentina Nikclaevna
Levitsky Emmanuil Aronovich
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