B - Operations – Transporting – 01 – J
Patent
B - Operations, Transporting
01
J
252/2.A
B01J 19/18 (2006.01)
Patent
CA 1186294
ABSTRACT OF THE DISCLOSURE In a process for the conversion of meta-kaolin into an aqueous, alkaline suspension of low-grit, water- containing, zeolitic sodium aluminosilicate of the smallest particle size having the molar composition: 0.9 to 1.1 Na2O : 1 Al2O3 : 1.8 to 2.3 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 25µ and has a high cation exchange capability, the improvement consisting of: slowly heating a suspension of reactants to a zeolitization temperature in the range of from 70 to 100°C, with a temperature rise averaging 20°C within a period of from two to ten minutes; feeding the suspension, preferably before the slow heating, continuously into a reactor having progressively, separately zoned mixing areas with a stage-like effect and having at least seven stages while mixing the suspension sufficiently in the respective stages to avoid sedimentation; maintaining the suspension in the reactor at a preselected temperature in the range of from 70 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 continuously removing an aqueous, alkaline suspension of zeolitic sodium aluminosilicate from the end opposite of the intake end of the reactor. The suspension traverses the reactor at a rate in the range of 1 to 3 cubic meters of suspension per cubic meter of reactor volume and per hour. Reactors preferred for the reaction are an agitator vessel cascade with at least seven vessels, an agitator column with at least seven chambers, and a flowing tube reactor which has a ratio of tube length to tube diameter in the range of 3,000 to 7,000.
415660
Christophliemk Peter
Wust Willi
Aktiengesellschaft Degussa
Henkel Kommanditgesellschaft Auf Aktien (henkel Kgaa)
Macrae & Co.
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