Crystallization of paraxylene from high purity paraxylene feeds

Details Crystallization of paraxylene from high purity paraxylene feeds Crystallization of paraxylene from high purity paraxylene feeds

C - Chemistry, Metallurgy

07

C

C07C 15/08 (2006.01) C07C 7/14 (2006.01)

Patent

CA 2186457

This invention is a crystallization process for p-xylene recovery. A single temperature crystallization production stage (18) is used for producing p-xylene from a feed having an above equilibrium p-xylene concentration, such as from a toluene disproportionation process. Scavenger stages (42) are also used to raise the p-xylene recovery rate.

L'invention est un procédé de cristallisation destiné à la récupération de p-xylène. On utilise une seule étape (18) de production par cristallisation en température pour produire du p-xylène à partir d'une charge présentant une concentration en p-xylène supérieure à celle de l'équilibre, telle que résultant d'un procédé de disproportion du toluène. On met également en oeuvre plusieurs étapes d'épuration (42) afin d'élever le taux de récupération de p-xylène.

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