Method for producing a particulate zeolite and a particulate...

B - Operations – Transporting – 01 – J

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B01J 20/18 (2006.01) C01B 39/38 (2006.01)

Patent

CA 2068670

Finely particulate Zeolites of the ZSM-5 family, exhibiting characteristic peaks in an X-ray powder diffraction pattern, are stably produced by a novel method in which a nucleating slurry containing semi- crystalline zeolite having a BET surface area of 100 to less than 250 m/g is mixed with a raw material mixture of silica, alumina and alkali metal sources to obtain a preliminary slurry, followed by heating to obtain a first precursory slurry mixture containing a precursory zeolite having a BET surface area of 100 to 200 m/g, and subsequently the first precursory slurry mixture is mixed with a raw material mixture as mentioned above to obtain a second precursory slurry, followed by heating to obtain a product slurry containing a finely particu- late zeolite having a BET surface area of at least 250 m/g. In the method, the first precursory slurry mixture can be advantageously recycled and used as a nucleating slurry. The zeolites are advantageously utilized as catalysts, for example, as a catalyst for hydration of olefins, and also as an adsorbent, a molecular sieve, an agent for soil improvement, a filler for paper and an agent for waste water treat- ment.

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