Silicate-bound zeolite granulates, process for their production

Details Silicate-bound zeolite granulates, process for their production Silicate-bound zeolite granulates, process for their production

1985-10-24

1987-12-22

Dees, Carl F.

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

Zeolite or clay, including gallium analogs

And additional al or si containing component

502 69, B01J 2906

Patent

active

047146907

ABSTRACT:
Silicate-bound zeolite granulates are disclosed wherein the zeolite contains a cation which is not present in the binder, and where the zeolite can also contain the binder cation. The granulates are produced by placing powdered zeolite in a mixer, adding sodium silicate solution, mixing until zeolite granulates with a grain size of at least 0.1 mm are obtained, optionally after-rolling the zeolite granulates. The moist zeolite granulates can be initially dried at temperatures of 20 degrees to 39 degrees C., where the carbon dioxide content of the drying air is adjusted to less than 200 ppm. Thereafter, a second drying step can be carried out at temperatures of 40 degrees to 120 degrees C. as well as a third drying stage at 121 degrees to 200 degrees C. under otherwise identical conditions. The products may be activated at temperatures of 600 degrees C. maximum. The zeolite granulates thus obtained are then treated with a first aqueous metal salt solution, washed and then optionally treated with a second aqueous metal salt solution, washed and dried again at 40 degrees to 200 degrees C., preferably 100 degrees to 120 degrees C., and then optionally calcined to 300 degrees to 650 degrees C.

REFERENCES:
patent: 2973327 (1961-02-01), Mitchell et al.
patent: 3055841 (1962-09-01), Gladrow et al.
patent: 3377295 (1968-04-01), Pryor
patent: 3624003 (1971-11-01), Conde et al.

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