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US 2002/0076374 A1Published application
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.
Claims4
A process for the preparation of P zeolite having the oxide formula
- 6 M 2 n O · Al 2 O 3 · ( 1.80 - 2.66 ) SiO 2 · yH 2 0
- wherein y is the water content, comprising the steps of:
- i. a sodium aluminate solution having a temperature of at least 25° C. is mixed with a sodium silicate solution at a temperature of at least 25° C. in a stirred vessel in the presence of a slurry of P zeolite seed to form a gel having the composition,
- Al2O3:(1.00-3.5)SiO2:(1.2-7.5)Na2O:(25 to 450) (preferably 40 to 150) H2O
- ii. ageing the gel at a temperature above about 25° C. with stirring to maintain solids in suspension for a period of least about 0.1 hour, and
- iii. separating the P zeolite product, washing and drying.
3 more elements
P zeolite having the oxide formula
- 8 M 2 n O · Al 2 O 3 · ( 1.90 - 2.10 ) SiO 2 · yH 2 0
- wherein y is the water content and having a calcium effective binding capacity of above 150 mg/g, an oil absorption of above 80 g of oil per 100 g of zeolite and a calcium uptake rate of below 10 seconds.
Dependencies are inferred from the claim text.