Process for the continuous crystallization of zeolitic...

Details Process for the continuous crystallization of zeolitic... Process for the continuous crystallization of zeolitic...

B - Operations, Transporting

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B01J 29/04 (2006.01) B01J 37/08 (2006.01) C01B 39/02 (2006.01)

Patent

CA 1141741

K-5985 NLJr/gk ABSTRACT OF THE DISCLOSURE In a process for the production of an aqueous alkaline suspension of low-grit, crystallized zeolitic sodium aluminosilicate of the smallest particle size having the composition 0.9 to 1.1 Na2O . lAl2O3 . 1.8 to 2.5 SiO2 with a water content depending on the degree of drying, which contains at least 99.8% by weight of a particle size of less than 25 µm and has a high cation exchange capabili- ty, comprising crystallization of an aqueous alkaline suspen- sion of an x-ray-amorphous sodium aluminsolicate, said suspension:- having a composition corresponding to the molar ratios of 1.5 to 5 Na2O : 1. A12O3 : 1 to 4 SiO2 : 40 to 400 H2O, at elevated temperatures and recovering crystallized zeolitic sodium aluminosilicate, the improvement consisting of feeding the suspension of the x-ray-amorphous sodium aluminosilicate continuously into a crystallizing reactor having progressively, separately zoned mixing areas with a stage-like effect and having at least 20 stages, wherein the suspension flows first through at least 8 stages in the intake part of the reactor, which intake part of the reactor may comprise up to one third of the total reactor volume, maintaining said suspension in the reactor at a preselected temperature in the range of from 80° to 100°C until the degree of crystallization of the zeolitic sodium aluminosilicate, determined by x-ray, has reached at least 80% of the theoretically possible crystallinity, and con- tinuously removing the suspension from the end opposite of the intake end of the reactor. -A-

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