Para-xylene process using perm-selective separations

Details Para-xylene process using perm-selective separations Para-xylene process using perm-selective separations

C - Chemistry, Metallurgy

07

C

C07C 7/144 (2006.01) B01D 61/00 (2006.01) C07C 15/08 (2006.01) C10G 31/11 (2006.01)

Patent

CA 2541540

Processes and apparatus are disclosed for recovery of purified products from a fluid mixture by means of integrated perm-~selective separations with purified product recovery operations. More particularly, integrated processes of the invention comprise separations by means of one or more devices using polymeric membranes coupled with recovery of purified products by means of fractional crystallization and/or selective sorption. Processes of the invention are particularly useful for recovery of a very pure aromatic isomer when processing aromatic starting materials, for example, a pure para-xylene product from liquid mixtures even containing ethylbenzene as well as the three xylene isomers.

L'invention concerne des procédés et des appareils qui permettent de récupérer des produits purifiés issus d'un mélange de fluides au moyen de séparations permsélectives intégrées dans des opérations de récupération de produits. D'une manière plus spécifique, les procédés intégrés selon l'invention comprennent des séparations réalisées au moyen d'un ou de plusieurs dispositifs qui utilisent des membranes polymères couplées à la récupération de produits purifiés par cristallisation fractionnelle et/ou sorption sélective. Les procédés selon l'invention conviennent particulièrement à la récupération d'un isomère aromatique très pur pendant le traitement de matières premières aromatiques, par exemple, un produit à base de para-xylène pur issu de mélanges liquides, y compris de mélanges contenant de l'éthylbenzène ainsi que trois isomères xylène.

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