Chemistry of inorganic compounds – Silicon or compound thereof – Oxygen containing
Patent
1986-03-31
1987-03-10
Doll, John
Chemistry of inorganic compounds
Silicon or compound thereof
Oxygen containing
423329, 502 60, C01B 3328
Patent
active
046490361
ABSTRACT:
The synthesis of zeolites 4A having a high crystallinity and a fine granulometry is disclosed, by the addition in a first stage of a sodium silicate solution to a sodium aluminate solution (containing an excess of NaOH and heated to a temperature of from 50.degree. to 100.degree. C.), and by the crystallization in a second stage at a temperature of from 70.degree. to 105.degree. C., characterized in that the temperature of the sodium silicate solution is lower by at least twenty Centigrade degrees than that of the sodium aluminate solution, the molar ratios SiO.sub.2 :H.sub.2 O and SiO.sub.2 :Na.sub.2 O in the sodium silicate solution being respectively from 0.030 to 0.150 and from 1.95 to 2.30, and the weight ratio between the reaction mother liquor and the zeolite thus formed being from 6.5 to 20.
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Pastorello Fabio
Troglia Claudio
Doll John
Leeds Jackson
Montedison S.p.A.
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