Production of a zeolite-containing solid

C - Chemistry – Metallurgy – 01 – B

Patent

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Details

C01B 39/02 (2006.01) B01J 29/06 (2006.01) B01J 29/89 (2006.01) C01B 21/14 (2006.01) C07B 41/02 (2006.01) C07C 249/08 (2006.01) C07D 301/12 (2006.01) B01J 29/04 (2006.01)

Patent

CA 2492395

The invention relates to a method for concentrating an at least partially crystalline solid containing at least one zeolite in a mixture, said mixture containing at least one auxiliary agent, for example a template compound, and the cited solid. The inventive method is characterised in that the mixture is divided into a retentate and a permeate in one step (II) by means of ultrafiltration, the solid content in the retentate being higher than that in the mixture and the solid content in the permeate being lower than that in the mixture. Said method enables auxiliary agents in the permeate, especially template compounds, to be redirected into a crystallisation step (I) which precedes the cited step (II).

La présente invention concerne un procédé pour concentrer une matière solide qui est au moins partiellement cristalline, contient au moins un zéolithe et se trouve dans un mélange. Ledit mélange comprend au moins un adjuvant, tel qu'un composé matrice, ainsi que ladite matière solide. Le procédé selon cette invention est notamment caractérisé en ce que le mélange est divisé par ultrafiltration, au cours d'une étape (II), en un rétentat et en un perméat, la teneur en matière solide dans le rétentat étant supérieure à celle dans le mélange et la teneur en matière solide dans le perméat étant inférieure à celle dans le mélange. Ce procédé permet de recycler des adjuvants se trouvant dans le perméat, notamment des composés matrices, dans une étape de cristallisation (I) située en aval de l'étape (II).

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