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Improvement of para-xylene SMB process performance on an industrial scale / Young-Il Lim in Industrial & engineering chemistry research, Vol. 49 N° 7 (Avril 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 7 (Avril 2010) . - pp. 3316–3327 Titre : Improvement of para-xylene SMB process performance on an industrial scale Type de document : texte imprimé Auteurs : Young-Il Lim, Auteur ; Jinsuk Lee, Auteur ; Suresh K. Bhatia, Auteur Année de publication : 2010 Article en page(s) : pp. 3316–3327 Note générale : Industrial Chemistry Langues : Anglais (eng) Mots-clés : para-Xylene  SMB  Industrial Résumé : Dead volume classified as bed head, bed tail, and bed line affects the purity and recovery in industrial-scale simulated-moving-bed (SMB) processes. Considering the three types of dead volume, the operation strategies for four, seven, and eight zones are presented for an industrial-scale para-xylene (PX) SMB process, and their performances are compared in terms of purity, recovery, and dilution. The dead volume is treated by a Courant−Friedrichs−Lewy- (CFL-) number-insensitive method of characteristics (MOC). An extended node model integrating the dead volumes has been developed and solved by using the MOC. Seven-zone operation including line and secondary flushes enhances the purity, while keeping almost the same recovery as achieved with four-zone operation. The secondary flush introducing pure PX reduces the dilution of the extract. Eight-zone operation with both a secondary flush introducing pure PX and a tertiary flush-out shows high productivity with low dilution and over 99.7% purity. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901097z [article] Improvement of para-xylene SMB process performance on an industrial scale [texte imprimé] / Young-Il Lim, Auteur ; Jinsuk Lee, Auteur ; Suresh K. Bhatia, Auteur . - 2010 . - pp. 3316–3327. Industrial Chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 7 (Avril 2010) . - pp. 3316–3327 Mots-clés : para-Xylene  SMB  Industrial Résumé : Dead volume classified as bed head, bed tail, and bed line affects the purity and recovery in industrial-scale simulated-moving-bed (SMB) processes. Considering the three types of dead volume, the operation strategies for four, seven, and eight zones are presented for an industrial-scale para-xylene (PX) SMB process, and their performances are compared in terms of purity, recovery, and dilution. The dead volume is treated by a Courant−Friedrichs−Lewy- (CFL-) number-insensitive method of characteristics (MOC). An extended node model integrating the dead volumes has been developed and solved by using the MOC. Seven-zone operation including line and secondary flushes enhances the purity, while keeping almost the same recovery as achieved with four-zone operation. The secondary flush introducing pure PX reduces the dilution of the extract. Eight-zone operation with both a secondary flush introducing pure PX and a tertiary flush-out shows high productivity with low dilution and over 99.7% purity. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901097z