Process for the production of crystalline zeolitic molecular sie

Details Process for the production of crystalline zeolitic molecular sie Process for the production of crystalline zeolitic molecular sie

1976-03-30

1978-02-14

Meros, Edward J.

Chemistry of inorganic compounds

Carbon or compound thereof

Oxygen containing

252131, 252135, 423328, 106288B, C01B 3328

Patent

active

040738671

ABSTRACT:
A crystalline zeolitic molecular sieve of Type A with the composition 1.0 .+-. 0.2 M.sub.2
O : Al.sub.2 O.sub.3 : 1.85 .+-. 0.5 SiO.sub.2 . y H.sub.2 O where M is a metal cation, n its valence and y has a value up to 6 is prepared having particles with at least 99.5 weight % below 30.mu. diameter, as well as at least 90 weight % under 10.mu. and with 50 weight % below 6.5.mu. by hydrothermal crystallization of an alkali-aluminate silicate by pouring together an aqueous alkali silicate solution and a slightly concentrated aqueous alkali aluminate liquor, in a given case with simultaneous stirring in a receiver, allowing the synthesis premixture to solidify to a gel, adding to this gel a more highly concentrated aqueous alkali aluminate liquor at a temperature between 10.degree. and 100.degree. C. while stirring, allowing the thus obtained synthesis mixture to crystallize at a temperature between 20.degree. and 175.degree. C., preferably 100.degree. C., within 15 minutes and in a given case including a tempering step.

REFERENCES:
patent: 2882243 (1959-04-01), Milton
patent: 2982612 (1961-05-01), Barrer et al.
patent: 3433588 (1969-03-01), Michel et al.
patent: 3985669 (1976-10-01), Krummel
Sotirova et al., "Chemical Abstracts", vol. 77, 1972, 77363t.

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