Crystalline type-a zeolite molecular sieve and a process for...

Details Crystalline type-a zeolite molecular sieve and a process for... Crystalline type-a zeolite molecular sieve and a process for...

C - Chemistry, Metallurgy

11

D

252/15

C11D 3/12 (2006.01) C11D 3/00 (2006.01)

Patent

CA 1073430

ABSTRACT OF THE DISCLOSURE The present invention provides a process of producing a crystalline type-A zeolite molecular sieve having the stoichiometric formula 1.0 : 0.2 M2.nO :Al2O3 : 1.85 : 0.5 SiO2 . y M2O, wherein M represents a metal cation, n represents the valency of the metal cation and y represents a number of up to 6, the molecular sieve being in the form of particles, at least 99.5% by weight of the particles having diameters smaller than 30 µm and at least 90% by weight of the particles having dia- meters smaller than 10 µm and 50% by weight of the particles having diameters below a value not exceeding 6.5 µm, comprises admixing an aqueous alkali-silicate solution and a first aqueous alkali-aluminate liquor containing no more than 75% by weight of soluble Al2O3 . H2O to form a presynthesis mixture, allowing the presynthesis mixture to congeal so as to form a gel, adding a second aqueous alkali-aluminate liquor having a higher concen- tration of soluble Al2O3 . H2O than the first aqueous alkali- aluminate liquor to said gel at a temperature between 10 and 100°C while stirring to obtain a synthesis mixture and allowing the synthesis mixture to crystallize at a temperature between 20 and 175°C, for at least 15 minutes.

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