Documents disponibles écrits par cet auteur

Experimental and theoretical studies of a dividing - wall column used for the recovery of high - purity products / Gerit Niggemann in Industrial & engineering chemistry research, Vol. 49 N° 14 (Juillet 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 14 (Juillet 2010) . - pp. 6566–6577 Titre : Experimental and theoretical studies of a dividing - wall column used for the recovery of high - purity products Type de document : texte imprimé Auteurs : Gerit Niggemann, Auteur ; Christoph Hiller, Auteur ; Georg Fieg, Auteur Année de publication : 2010 Article en page(s) : pp. 6566–6577 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Dividing  wall  columns. Résumé : Although dividing-wall columns are now well established in industrial practice, their complex hydraulics is not well understood, and open literature does not provide any quantitative information in this respect. This study aims to provide the missing knowledge. Hence, a pilot plant was built to separate a ternary mixture of fatty alcohols into high-purity products of 99 wt %. A model was established to simulate this separation process. It could successfully describe the experiments quantitatively and even account for the self-adjustment of the vapor splits. A case study with the validated model highlighted the strong influence of the heat transfer across the vertical partition wall on hydrodynamics and vapor distribution. These aspects are of special interest for the design and scale-up of dividing-wall columns. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1003416 [article] Experimental and theoretical studies of a dividing - wall column used for the recovery of high - purity products [texte imprimé] / Gerit Niggemann, Auteur ; Christoph Hiller, Auteur ; Georg Fieg, Auteur . - 2010 . - pp. 6566–6577. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 14 (Juillet 2010) . - pp. 6566–6577 Mots-clés : Dividing  wall  columns. Résumé : Although dividing-wall columns are now well established in industrial practice, their complex hydraulics is not well understood, and open literature does not provide any quantitative information in this respect. This study aims to provide the missing knowledge. Hence, a pilot plant was built to separate a ternary mixture of fatty alcohols into high-purity products of 99 wt %. A model was established to simulate this separation process. It could successfully describe the experiments quantitatively and even account for the self-adjustment of the vapor splits. A case study with the validated model highlighted the strong influence of the heat transfer across the vertical partition wall on hydrodynamics and vapor distribution. These aspects are of special interest for the design and scale-up of dividing-wall columns. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1003416

Validation of Dividing-Wall Columns Based on Experimental Data and Dynamic Simulations / Gerit Niggemann in Industrial & engineering chemistry research, Vol. 51 N° 2 (Janvier 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 2 (Janvier 2012) . - pp. 931-943 Titre : Validation of Dividing-Wall Columns Based on Experimental Data and Dynamic Simulations : Pilot-Plant and Production-Scale Columns Type de document : texte imprimé Auteurs : Gerit Niggemann, Auteur ; Georg Fieg, Auteur Année de publication : 2012 Article en page(s) : pp. 931-943 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Modeling  Production  Pilot  plant  Dynamic  model Résumé : Dividing-wall columns are a promising separation device in terms of energy efficiency because they are suitable for the complete separation of ternary mixtures. The increased application of this progressive technology is based on reduced capital and operating costs. Although several articles have already been published in the field of dividing-wall columns, reliable knowledge is still missing concerning the dynamics of this separation process. To bridge this gap, experimental data on the process dynamics of dividing-wall columns around a steady-state operating point are presented herein, together with extensive model validation of the transient behavior of dividing-wall columns. Furthermore, the process model was successfully compared with experimental data from a production-scale dividing-wall column, which emphasizes the validity of the model. Thus, the validated process model serves as a virtual plant and can be used to develop and test future process control structures. Moreover, the knowledge gained from this study will help to increase the acceptance of dividing-wall columns in industry. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25476426 [article] Validation of Dividing-Wall Columns Based on Experimental Data and Dynamic Simulations : Pilot-Plant and Production-Scale Columns [texte imprimé] / Gerit Niggemann, Auteur ; Georg Fieg, Auteur . - 2012 . - pp. 931-943. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 2 (Janvier 2012) . - pp. 931-943 Mots-clés : Modeling  Production  Pilot  plant  Dynamic  model Résumé : Dividing-wall columns are a promising separation device in terms of energy efficiency because they are suitable for the complete separation of ternary mixtures. The increased application of this progressive technology is based on reduced capital and operating costs. Although several articles have already been published in the field of dividing-wall columns, reliable knowledge is still missing concerning the dynamics of this separation process. To bridge this gap, experimental data on the process dynamics of dividing-wall columns around a steady-state operating point are presented herein, together with extensive model validation of the transient behavior of dividing-wall columns. Furthermore, the process model was successfully compared with experimental data from a production-scale dividing-wall column, which emphasizes the validity of the model. Thus, the validated process model serves as a virtual plant and can be used to develop and test future process control structures. Moreover, the knowledge gained from this study will help to increase the acceptance of dividing-wall columns in industry. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25476426