Xylene process using perm-selective separations

Details Xylene process using perm-selective separations Xylene process using perm-selective separations

C - Chemistry, Metallurgy

07

C

C07C 7/144 (2006.01) C07C 15/08 (2006.01)

Patent

CA 2545143

Processes are disclosed for production of purified products from a fluid mixtures of C8 aromatics by means of integration of perm-selective separations with purified product recovery operations. The perm-selective separations of the invention comprise of one or more devices using polymeric perm-selective membrane devices to separate a meta-xylene enriched stream from fluid mixtures of C8 aromatics thereby producing a fluid comprising the remaining aromatic compounds which advantageously includes para-xylene. Processes of the invention are particularly useful for recovery of very pure meta-xylene and para-xylene co-products from liquid mixtures even containing ethylbenzene as well as the three xylene isomers.

L'invention concerne des procédés qui permettent de produire des produits purifiés issus de mélanges fluides de produits aromatiques C¿8? au moyen de l'intégration de séparations permsélectives dans des opérations de récupération de produits purifiés. Les séparations permsélectives selon l'invention comprennent un ou plusieurs dispositifs qui utilisent des dispositifs à membranes permsélectives polymères afin de séparer un flux enrichi au méta-xylène de mélanges fluides de produits aromatiques C¿8?, produisant ainsi un fluide contenant les composés aromatiques résiduels qui, de façon avantageuse, comprennent le para-xylène. Les procédés selon l'invention conviennent particulièrement à la récupération de co-produits très purs à base de méta-xylène et de para-xylène issus de mélanges liquides, y compris de mélanges contenant de l'éthylbenzène ainsi que trois isomères xylène.

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