Discontinuous metering of catalysts and process auxiliaries...

C - Chemistry – Metallurgy – 08 – F

Patent

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C08F 10/00 (2006.01) B01J 8/24 (2006.01) B01J 8/26 (2006.01) C08F 2/34 (2006.01)

Patent

CA 2522532

Method of metering at least one solid, particulate catalyst into a reactor containing a fluidized bed (11) of particles in an at least partly gaseous medium, in which the catalyst is metered discontinuously at prescribed time intervals into the fluidized bed (11) at at least one metering point (10). According to the present invention, a fluid stream is firstly introduced into the reactor (5) so that a region having a reduced particle density is formed in the fluidized bed (11) around the metering point (10) and the catalyst is subsequently metered into this region. As a result of the prior introduction of a fluid stream ("preblowing") before the actual introduction of the catalyst, the catalyst can penetrate significantly deeper into the fluidized bed from the metering point due to the reduced particle density and is dispersed better.

L'invention concerne un procédé de dosage d'au moins un catalyseur particulaire, solide, dans un réacteur contenant un lit fluidisé (11) de particules dans au moins un support partiellement gazeux, dans lequel le catalyseur est dosé de façon discontinue à des intervalles de temps prédéfinis dans le lit fluidisé (11) au niveau d'au moins un point de dosage (10). Selon cette invention, un flux de fluide est tout d'abord introduit dans le réacteur (5) de sorte qu'une zone possédant une densité particulaire réduite soit formée dans le lit fluidisé (11) autour du point de dosage (10) et le catalyseur est ensuite dosé dans cette zone. Suite à la première introduction d'un flux de fluide (<= soufflage intermédiaire >=) avant l'introduction réelle du catalyseur, le catalyseur peut pénétrer de manière significativement plus profonde dans le lit fluidisé à partir du point de dosage du fait de la densité particulaire réduite et, est mieux dispersé.

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