Documents disponibles écrits par cet auteur

Active vapor split control for dividing-wall columns / Deeptanshu Dwivedi in Industrial & engineering chemistry research, Vol. 51 N° 46 (Novembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 46 (Novembre 2012) . - pp. 15176-15183 Titre : Active vapor split control for dividing-wall columns Type de document : texte imprimé Auteurs : Deeptanshu Dwivedi, Auteur ; Jens P. Strandberg, Auteur ; Ivar J. Halvorsen, Auteur Année de publication : 2013 Article en page(s) : pp. 15176-15183 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Distillation  columns  Energy Résumé : Dividing-wall distillation columns offer large potential energy savings over conventional column sequences, typically up to 30% for three-product (Petlyuk) columns and 40% for four-product (Kaibel) columns. However, the energy required for a separation depends on using an optimal vapor split. Hence, the energy saving potential may be lost if the column is operated away from its optimal point, for example, due to feed composition changes. This work demonstrates experimentally that the vapor split can be effectively used as a degree of freedom during operation, for example, for temperature control in the prefractionator section. Together with an adjustable liquid split, the vapor split control allows for minimizing the energy requirements. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie3014346 [article] Active vapor split control for dividing-wall columns [texte imprimé] / Deeptanshu Dwivedi, Auteur ; Jens P. Strandberg, Auteur ; Ivar J. Halvorsen, Auteur . - 2013 . - pp. 15176-15183. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 46 (Novembre 2012) . - pp. 15176-15183 Mots-clés : Distillation  columns  Energy Résumé : Dividing-wall distillation columns offer large potential energy savings over conventional column sequences, typically up to 30% for three-product (Petlyuk) columns and 40% for four-product (Kaibel) columns. However, the energy required for a separation depends on using an optimal vapor split. Hence, the energy saving potential may be lost if the column is operated away from its optimal point, for example, due to feed composition changes. This work demonstrates experimentally that the vapor split can be effectively used as a degree of freedom during operation, for example, for temperature control in the prefractionator section. Together with an adjustable liquid split, the vapor split control allows for minimizing the energy requirements. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie3014346

Steady state and dynamic operation of four-product dividing-wall (Kaibel) columns / Deeptanshu Dwivedi in Industrial & engineering chemistry research, Vol. 51 N° 48 (Décembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 48 (Décembre 2012) . - pp. 15696–15709 Titre : Steady state and dynamic operation of four-product dividing-wall (Kaibel) columns : Experimental verification Type de document : texte imprimé Auteurs : Deeptanshu Dwivedi, Auteur ; Jens P. Strandberg, Auteur ; Ivar J. Halvorsen, Auteur Année de publication : 2013 Article en page(s) : pp. 15696–15709 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Dynamic  Energy Résumé : Control and operation of energy-efficient dividing-wall columns can be challenging. This paper demonstrates experimentally the start-up and steady state operation of a four-product Kaibel column separating methanol, ethanol, propanol, and n-butanol. We use a control structure with four temperature controllers and show that it can handle feed rate disturbances as well as set point changes. The experiments compare well with an equilibrium stage model. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie301432z [article] Steady state and dynamic operation of four-product dividing-wall (Kaibel) columns : Experimental verification [texte imprimé] / Deeptanshu Dwivedi, Auteur ; Jens P. Strandberg, Auteur ; Ivar J. Halvorsen, Auteur . - 2013 . - pp. 15696–15709. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 48 (Décembre 2012) . - pp. 15696–15709 Mots-clés : Dynamic  Energy Résumé : Control and operation of energy-efficient dividing-wall columns can be challenging. This paper demonstrates experimentally the start-up and steady state operation of a four-product Kaibel column separating methanol, ethanol, propanol, and n-butanol. We use a control structure with four temperature controllers and show that it can handle feed rate disturbances as well as set point changes. The experiments compare well with an equilibrium stage model. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie301432z