Adsorptive separation process for recovery of para-xylene

Details Adsorptive separation process for recovery of para-xylene Adsorptive separation process for recovery of para-xylene

C - Chemistry, Metallurgy

07

C

C07C 15/08 (2006.01) C07C 7/13 (2006.01)

Patent

CA 2428749

The performance of an adsorptive separation process recovering para-xylene from a C8 aromatic hydrocarbon feed mixture is improved by operating the process at higher desorbent purity. The improved performance allows for tradeoffs in other operating parameters and rates or improved product rates. The process preferably employs a barium and potassium exchanged zeolitic molecular sieve as the adsorbent and toluene as the desorbent.

Selon l'invention, l'efficacité d'un procédé de séparation par adsorption permettant de récupérer du paraxylène contenu dans un mélange d'alimentation d'hydrocarbures aromatiques C¿8? est accrue lorsque le procédé est mis en oeuvre à une pureté de désorbant supérieure. Cette efficacité accrue permet des ajustements réciproques entre d'autres paramètres et niveaux de fonctionnement ou des niveaux de production améliorés. Selon ce procédé, on utilise de préférence un tamis moléculaire zéolitique échangé par barium et par potassium comme adsorbant et du toluène comme désorbant.

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