Regeneration of aromatization catalysts

B - Operations – Transporting – 01 – J

Patent

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B01J 29/90 (2006.01) B01J 29/62 (2006.01) B01J 38/44 (2006.01) C07C 15/04 (2006.01) C10G 35/095 (2006.01)

Patent

CA 2155549

A low-pressure, high-temperature, wet post-treatment after oxyhalogenation during regeneration to improve activity and selectivity recovery of a regenerated catalyst involves exposing a halogenated catalyst to a gaseous stream including water having a partial pressure of up to 1.5 psia, oxygen having a partial pressure of less than 4.5 psia, and an inert gas at a temperature within the range of about 450 ·C to about 530 ·C at a pressure within the range of about 14.7 psia to about 65 psia for a time sufficient to effect a hydrogen halide partial pressure in offgas from the halogenated catalyst of less than about 0.004 psia to effectively remove excess halide from the halogenated catalyst.

Selon l'invention, un traitement humide à haute température et basse pression, postérieur à une oxyhalogénation, au cours d'une régénération tendant à améliorer la récupération, par un catalyseur régénéré, de son activité et de sa sélectivité, consiste à exposer le catalyseur halogéné à un courant gazeux comprenant de l'eau dont la pression partielle peut aller jusqu'à 1,5 psia, de l'oxygène dont la pression partielle est inférieure à 4,5 psia, ainsi qu'un gaz inerte dont la température est comprise entre environ 450~ C et environ 530~ C et la pression est comprise entre environ 14,7 psia et environ 65 psia, pendant une période suffisante pour obtenir une pression partielle d'halogénure d'hydrogène, dans le gaz de dégagement, à partir du catalyseur halogéné, qui soit inférieure à environ 0,004 psia, cela afin d'enlever, de manière efficace, l'excès d'halogénure du catalyseur halogéné.

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