Process for the thermal activation of zeolites and resultant products
AssigneeCeca S.A.
InventorsGuy Durand, Dominique Plee, Daniel Delcroix
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Abstract
The invention describes a process for thermal activation of zeolites that are sensitive to hydrothermal degradation by percolating a hot gas through a homogeneous bed of granulates of the said zeolites. It applies to type A an X zeolites, and more particularly to their forms exchanged by potassium or calcium and one preferably uses air, the temperature of which ranges between about 300.degree. C. and 700.degree. C., preferably between 550.degree. C. and 600.degree. C., and preferably with dehydrated and decarbonated air, forced through the bed of granulates at linear velocities ranging between 0.01 and 1 m/second NTP. The process makes it possible to obtain novel zeolites with high nitrogen adsorption capacity.
Claims10
A process for activation of zeolites A or X that are sensitive to degredation by the combined action of water vapor and temperature to produce activated zeolites with a nitrogen adsorption capacity, of at least 4 mg/g comprising forming a substantially homogeneous bed of granulates of said zeolite in its hydrated form, passing through said bed a current of a preheated, nonacid, dry gas at a substantially uniform velocity through the bed, continuing the passage of gas through said bed until, upon exiting from the bed, the gas is at a constant temperature close to its entry temperature at which time the activation is completed, and the removing and packing said activated zeolites without exposing said zeolite to the ambient air.
Dependencies are inferred from the claim text.