A process for preparing molecular sieves via continuous...

C - Chemistry – Metallurgy – 01 – B

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C01B 37/08 (2006.01) C01B 39/02 (2006.01)

Patent

CA 2617450

A process for synthesizing a variety of molecular sieves has been developed. The process involves forming a reaction mixture comprising reactive sources of the framework elements plus at least one templating agent, reacting the mixture to at least partially crystallize the molecular sieve and provide a slurry of seed crystals and adding to it nutrients (sources) of the framework elements, e.g. aluminum and silicon in order to grow the seed crystals. The rate of addition of the nutrients is controlled such that it is substantially the same as the crystal growth rate and such that there is substantially no nucleation of new crystals. The seed crystals may be the same or different than the nutrients being added, thus allowing for a layered molecular sieve. When the crystals have reached a desired size, they are isolated by conventional techniques.

L'invention concerne un procédé de synthèse d'une variété de tamis moléculaires, qui consiste à former un mélange réactif comprenant des sources réactives des éléments d'ossature auxquels est ajouté au moins un agent structurant, à faire réagir le mélange de façon à au moins partiellement cristalliser le tamis moléculaire et produire une suspension de cristaux germes et à y ajouter des nutrients (sources) des éléments structurants, par exemple de l'aluminium et du silicium, afin de faire croître des cristaux germes. La vitesse d'addition des nutriants est régulée de façon qu'elle soit sensiblement la même que celle de la croissance des cristaux et qu'il n'y ait sensiblement aucune nucléation de nouveaux cristaux. Les cristaux germes peuvent être identiques aux nutrients ajoutés ou différents de ceux-ci, ce qui permet d'avoir un tamis moléculaire en couche. Lorsque les cristaux sont de la taille recherchée, ils sont isolés par des techniques classiques.

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