Zeolite granulate, process for its production

Abstract

According to the invention there are produced sodium Zeolite A granulates having the following parameters: ______________________________________ Adsorption Data: (p/po = 0.8, 20.degree. C.) ______________________________________ H.sub.2 O >22.0% NH.sub.3 >11.0% CO.sub.2 .ltoreq.0.1% O.sub.2 .ltoreq.0.1% N.sub.2 .ltoreq.0.1% Ar .ltoreq.0.1% CH.sub.3 OH .ltoreq.0.2% CH.sub.3 --CH.sub.2 --OH .ltoreq.0.2% ______________________________________ The zeolite granulate is produced by having zeolite A powder present in a mixer, adding alkali silicate solution, mixing until there are obtained zeolite granulates having a particle size of at least 0.1 mm, in a given case post-rolling the granulates, first drying the moist zeolite granulates with air in a fluidized bed drier at a temperature of 20.degree. to 39.degree. C., during which the carbon dioxide content of the drying air is adjusted to less than 200 ppm, subsequently drying in a second drying step at a temperature of 40.degree.-120.degree. C. and in a given case drying in a third drying step at 121.degree.-200.degree. C. under otherwise the same conditions and subsequently activating the thus obtained granulates at a temperature of at most 600.degree. C. in a rotary tube. The zeolite granulate is used in the production of insulating glass windows.

Dependencies are inferred from the claim text.