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US 3,939,246 AGranted
Manufacture of crystalline aluminosilicate zeolites
AssigneeMobil Oil Corporation
InventorLouis D. Rollmann
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Abstract
Crystallization of aluminosilicate zeolites of the molecular sieve type either as such or in aggregate combination with clay mineral is accomplished by the addition of a flux constituting an alkali metal salt to a kaolin-type clay prior to calcination and caustic aging of said clay.
Claims9
A process for effecting conversion of kaolin-type clays to crystalline aluminosilicate molecular sieve zeolites of the faujasite type which comprises:
- a. mixing the kaolin-type clay with a flux constituting a halide or carbonate of an alkali metal corresponding to between about 5 and about 20 weight percent, calculated as alkali metal oxide, of the kaolin-type clay;
- b. calcining the resulting mixture at a temperature within the approximate range of 880.degree. to 1100.degree.C. for a sufficient time for the clay to undergo the characteristic kaolin exotherm after dehydration is completed;
- and
- c. aging the fluxed calcined kaolin-type clay in an aqueous solution of sodium hydroxide of approximately 5 to 20 weight percent concentration at a temperature within the approximate range of 30.degree. to 110.degree.C. until crystallization of the aluminosilicate zeolite is achieved.
1 more element
Dependencies are inferred from the claim text.