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US 4,340,573 AGranted
Preparation of zeolites
AssigneeW. R. Grace & Co.
InventorsDavid E. W. Vaughan, Grant C. Edwards, Michael G. Barrett
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Abstract
Synthetic crystalline alumino-silicate zeolites are prepared by combining reactant quantities of alumina, silica, sodium hydroxide and water with zeolite-forming alumino-silicate seeds having the composition 16 Na.sub.2 O: 2 to 9 Al.sub.2 O.sub.3 : 15 SiO.sub.2 : 500 to 2000 H.sub.2 O. The seed compositions may be used to produce Type A, X and Y crystalline alumino-silicate zeolites.
Claims3
A method for preparing a crystalline aluminosilicate zeolite-forming seed composition having the mol ratio formula:
- 16Na.sub.2 O:2 to 9Al.sub.2 O.sub.3 :15SiO.sub.2 :500 to 2000H.sub.2 O
- which comprises:
- (a) mixing a sodium aluminate solution with a sodium silicate solution to obtain a gel having the following mol ratio formula:
- 16Na.sub.2 O:2 to 9Al.sub.2 O.sub.3 :15SiO.sub.2 :300 to 340H.sub.2 O;
- (b) agitating and reacting the gel obtained in step (a) at a temperature of from about 10.degree. to 80.degree. C. for about 1/4 to 96 hours;
- and
- (c) adding water to the gel obtained in step (b) with agitation to obtain a homogenous fluid seed composition having the mol ratio formula:
- 16Na.sub.2 O:2 to 9Al.sub.2 O.sub.3 :15SiO.sub.2 :500 to 2000H.sub.2 O.
5 more elements
Dependencies are inferred from the claim text.