Adsorptive separation of para-xylene using a tetralin desorbent

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182/6.5

B01D 15/04 (2006.01) C07C 7/13 (2006.01) C07C 15/08 (2006.01)

Patent

CA 2001645

Para-xylene is separated from a feed mixture of C8 isomers of xylene and C9 aromatics by contacting the para-xylene-containing feed mixture with an X or Y zeolite adsorbent having Group IA or IIA cations, e.g., barium and/or potassium, at exchangeable cationic sites. The para-xylene components are selectively adsorbed onto the adsorbent. The non-adsorbed feed is then removed from the adsorbent and the para-xylene recovered from the resulting rich adsorbent by desorption with a desorbent comprising tetralin or alkyl or dialkyl derivatives of tetralin or mixtures thereof. The majority of the C9 aromatics and the C8 xylene isomers are typically recovered in the raffinate andcan be separated from the desorbent by fractionation of the raffinate and the recovered desorbent recycled to the process.

Le para-xylène est séparé d'un mélange d'alimentation d'isomères C8 du xylène et d'aromatiques C9 par mise en contact du mélange d'alimentation renfermant le para-xylène avec un adsorbant à base de zéolite X ou Y, possédant des cations des Groupes IA ou IIA, p. ex. baryum et (ou) potassium, à des sites cationiques échangeables. Les constituants de type para-xylène sont sélectivement adsorbés sur l'adsorbant. L'alimentation non adsorbée est ensuite séparée de l'adsorbant, et on récupère le para-xylène de l'adsorbant enrichi résultant, par désorption avec un désorbant à base de tétraline ou de dérivés alkylés ou dialkylés de tétraline, ou de mélanges de ces composés. La majeure partie des aromatiques C9 et des isomères C8 du xylène sont normalement récupérés dans le raffinat, et ils peuvent être séparés du désorbant par fractionnement du raffinat, le désorbant récupéré étant recyclé dans le procédé.

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