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US 6,413,493 B1Granted
Process for producing P zeolite
AssigneeUnilever Patent Holdings B.V.
InventorAbraham Araya
Life of this patent
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Abstract
The invention describes a process for preparing P zeolites in which aluminate and silicate solutions are reacted in the presence of a P-zeolite seed.
Claims9
A process for the industrial scale preparation of pure P zeolite without any zeolite A and having the oxide formula
- M2/nO.Al2O3.(1.90-2.10)SiO2.yH2O
- wherein M is an n-valent alkali metal cation and y is the water content, comprising the steps of:
- i) mixing a sodium aluminate solution having a temperature of at least 60° C. with a sodium silicate solution at a temperature of at least 60° C. in a stirred vessel of 2 m3 volume or more, in the presence of a slurry of P zeolite seed to form a gel having the composition,
- Al2O3:(1.80-2.2)SiO2:(1.5-5)Na2O:(40 to 150)H2O
- ii) aging the gel at a temperature of at least 80° C. with stirring to maintain solids in suspension for a period of at least about 0.1 hour;
- and
- iii) separating the P zeolite product, washing the separated P zeolite product and drying the same.
4 more elements
Dependencies are inferred from the claim text.