Preparation of zeolite A by hydrothermal treatment of clinoptilolite
AssigneeAtlantic Richfield Company
InventorJohn J. Leonard
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Abstract
A process for producing zeolite A of the formula Na.sub.x (AlO.sub.2).sub.x (SiO.sub.2).sub.y.ZH.sub.2 O wherein x=10 to 14, y/x=0.8 to 1.2 and Z=1 to 30, which comprises heating at a temperature of 60.degree. to 150.degree. C. an aqueous slurry comprising (a) at least one gram of clinoptilolite of the formula Na.sub.x (AlO.sub.2).sub.x (SiO.sub.2).sub.y. ZH.sub.2 O wherein x=5 to 7, y/x=4.5 to 5.5 and Z=1 to 30, per 100 cc of slurry, (b) at least a stoichiometric amount of sodium aluminate, and (c) at least 1% by weight of sodium hydroxide until zeolite A forms and recovering zeolite A. Sodalite which may have the formula Na.sub.6 (AlO.sub.2).sub.6 (SiO.sub.2).sub.6.2NaCl can be produced by carrying out the aforesaid process in the presence of sodium chloride.
Claims7
A process for producing zeolite A of the formula
- Na.sub.x (AlO.sub.2).sub.x (SiO.sub.2).sub.y.ZH.sub.2 O
- wherein x=10 to 14, y/x=0.8 to 1.2 and Z=1 to 30, which comprises heating at a temperature of 60.degree. to 150.degree. C. an aqueous slurry comprising
- (a) from about 1 to 32 grams of natural clinoptilolite of the formula
- Na.sub.x (AlO.sub.2).sub.x (SiO.sub.2).sub.y.ZH.sub.2 O
- wherein x=5 to 7, y/x=4.5 to 5.5 and Z=1 to 30, per 100 cc of slurry,
- (b) a stoichiometric amount of sodium aluminate, and
- (c) from about 1 to 25% by weight of sodium hydroxide in water until zeolite A forms and recovering zeolite A.
A process for producing zeolite A of the formula
- Na.sub.12 (AlO.sub.2).sub.12 (SiO.sub.2).sub.12.27H.sub.2 O
- which comprises heating at a temperature of 60.degree. to 150.degree. C. an aqueous slurry comprising
- (a) from about 1 to 32 grams of natural clinoptilolite of the formula
- Na.sub.6 (AlO.sub.2).sub.6 (SiO.sub.2).sub.30.24H.sub.2 O
- per 100 cc of slurry,
- (b) a stoichiometric amount of sodium aluminate, and
- (c) from about 1 to 25% by weight of sodium hydroxide in water until said zeolite A forms and recovering said zeolite A.
A process according to claims 1 or 8 wherein said slurry contains from 8 to 16 grams of natural clinoptilolite per 100 cc of slurry.
Dependencies are inferred from the claim text.