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Normalized efficiency for stagewise operations / Branislav M. Jacimovic in Industrial & engineering chemistry research, Vol. 50 N° 12 (Juin 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 12 (Juin 2011) . - pp. 7437-7444 Titre : Normalized efficiency for stagewise operations Type de document : texte imprimé Auteurs : Branislav M. Jacimovic, Auteur ; Srbislav B. Genic, Auteur Année de publication : 2011 Article en page(s) : pp. 7437-7444 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Stagewise  operations Résumé : Tray efficiency in gas-liquid operations is a widely discussed theme, and the shortcomings of Murphree's, Hausen's, Standart's, and Holland's efficiencies are well-known. The new parameter "normalized efficiency" is defined as the ratio of the real tray mass transfer rate and theoretically maximal mass transfer rate obtained for the counter-current plug-flow model for both phases in the case of infinite contact surface. Normalized efficiency has several advantages over the previously defined efficiencies: the range of normalized efficiency is 0―1; normalized efficiency values for gas and liquid phases are equal. Furthermore, normalized efficiency can be easily used for determining the required number of trays in mass-transfer operations or for estimating the overall column efficiency. The usage of normalized efficiency does not raise any dilemma about the interpretation of enperimentally obtained results for trays working in distillation and sorption columns. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24239059 [article] Normalized efficiency for stagewise operations [texte imprimé] / Branislav M. Jacimovic, Auteur ; Srbislav B. Genic, Auteur . - 2011 . - pp. 7437-7444. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 12 (Juin 2011) . - pp. 7437-7444 Mots-clés : Stagewise  operations Résumé : Tray efficiency in gas-liquid operations is a widely discussed theme, and the shortcomings of Murphree's, Hausen's, Standart's, and Holland's efficiencies are well-known. The new parameter "normalized efficiency" is defined as the ratio of the real tray mass transfer rate and theoretically maximal mass transfer rate obtained for the counter-current plug-flow model for both phases in the case of infinite contact surface. Normalized efficiency has several advantages over the previously defined efficiencies: the range of normalized efficiency is 0―1; normalized efficiency values for gas and liquid phases are equal. Furthermore, normalized efficiency can be easily used for determining the required number of trays in mass-transfer operations or for estimating the overall column efficiency. The usage of normalized efficiency does not raise any dilemma about the interpretation of enperimentally obtained results for trays working in distillation and sorption columns. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24239059

Normalized efficiency for stagewise operations / Branislav M. Jacimovic in Industrial & engineering chemistry research, Vol. 50 N° 12 (Juin 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 12 (Juin 2011) . - pp. 7437-7444 Titre : Normalized efficiency for stagewise operations Type de document : texte imprimé Auteurs : Branislav M. Jacimovic, Auteur ; Srbislav B. Genic, Auteur Année de publication : 2011 Article en page(s) : pp. 7437-7444 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Stagewise  operations Résumé : Tray efficiency in gas-liquid operations is a widely discussed theme, and the shortcomings of Murphree's, Hausen's, Standart's, and Holland's efficiencies are well-known. The new parameter "normalized efficiency" is defined as the ratio of the real tray mass transfer rate and theoretically maximal mass transfer rate obtained for the counter-current plug-flow model for both phases in the case of infinite contact surface. Normalized efficiency has several advantages over the previously defined efficiencies: the range of normalized efficiency is 0―1; normalized efficiency values for gas and liquid phases are equal. Furthermore, normalized efficiency can be easily used for determining the required number of trays in mass-transfer operations or for estimating the overall column efficiency. The usage of normalized efficiency does not raise any dilemma about the interpretation of enperimentally obtained results for trays working in distillation and sorption columns. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24239059 [article] Normalized efficiency for stagewise operations [texte imprimé] / Branislav M. Jacimovic, Auteur ; Srbislav B. Genic, Auteur . - 2011 . - pp. 7437-7444. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 12 (Juin 2011) . - pp. 7437-7444 Mots-clés : Stagewise  operations Résumé : Tray efficiency in gas-liquid operations is a widely discussed theme, and the shortcomings of Murphree's, Hausen's, Standart's, and Holland's efficiencies are well-known. The new parameter "normalized efficiency" is defined as the ratio of the real tray mass transfer rate and theoretically maximal mass transfer rate obtained for the counter-current plug-flow model for both phases in the case of infinite contact surface. Normalized efficiency has several advantages over the previously defined efficiencies: the range of normalized efficiency is 0―1; normalized efficiency values for gas and liquid phases are equal. Furthermore, normalized efficiency can be easily used for determining the required number of trays in mass-transfer operations or for estimating the overall column efficiency. The usage of normalized efficiency does not raise any dilemma about the interpretation of enperimentally obtained results for trays working in distillation and sorption columns. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24239059

Reboiler separation efficiencies for binary systems / Branislav M. Jacimovic in Industrial & engineering chemistry research, Vol. 51 N° 16 (Avril 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 16 (Avril 2012) . - pp. 5793-5804 Titre : Reboiler separation efficiencies for binary systems Type de document : texte imprimé Auteurs : Branislav M. Jacimovic, Auteur ; Srbislav B. Genic, Auteur ; Nikola B. Jacimovic, Auteur Année de publication : 2012 Article en page(s) : pp. 5793-5804 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Binary  system  Reboiler Résumé : Reboilers are essential for the proper work of distillation and stripping columns. Hereby the intensity of axial mixing along the reboiler (Peclet number) is used for the reboiler separation efficiency modeling and estimation for binary systems. Two fully worked examples show that the separation (Murphree) efficiency varies significantly depending on the adopted reboiler flow model. Murphree efficiency ranges between 1.40 and 0.663 in example 1, and between 1.962 and 1 in example 2. The general conclusion is that the reboiler performance must be considered carefully in the case of design of the new plants,as well as in the case of “brown field” projects. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25834492 [article] Reboiler separation efficiencies for binary systems [texte imprimé] / Branislav M. Jacimovic, Auteur ; Srbislav B. Genic, Auteur ; Nikola B. Jacimovic, Auteur . - 2012 . - pp. 5793-5804. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 16 (Avril 2012) . - pp. 5793-5804 Mots-clés : Binary  system  Reboiler Résumé : Reboilers are essential for the proper work of distillation and stripping columns. Hereby the intensity of axial mixing along the reboiler (Peclet number) is used for the reboiler separation efficiency modeling and estimation for binary systems. Two fully worked examples show that the separation (Murphree) efficiency varies significantly depending on the adopted reboiler flow model. Murphree efficiency ranges between 1.40 and 0.663 in example 1, and between 1.962 and 1 in example 2. The general conclusion is that the reboiler performance must be considered carefully in the case of design of the new plants,as well as in the case of “brown field” projects. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25834492

Tray efficiency versus stripping factor / Branislav M. Jacimovic in Industrial & engineering chemistry research, Vol. 50 N° 12 (Juin 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 12 (Juin 2011) . - pp. 7445-7451 Titre : Tray efficiency versus stripping factor Type de document : texte imprimé Auteurs : Branislav M. Jacimovic, Auteur ; Srbislav B. Genic, Auteur Année de publication : 2011 Article en page(s) : pp. 7445-7451 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Stripping  Plate  column  Plate  efficiency Résumé : Estimation of the tray (plate) efficiency is the basis of trayed column design. A newly introduced parameter "normalized efficiency" (η) is compared to the stripping factor (λ) in order to derive a correlation which can be useful in engineering practice. The proposed correlation is based on the numerous data gathered from various literature sources describing distillation, absorption, and stripping (desorption) columns and covering sieve, tunnel, bubble-cup, uniflux, and jet trays, in the range λ = 0.0391―2196. The final form of this correlation is with correlation ratio Θ = 0.883 and standard deviation Δav = 13.1%. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24239060 [article] Tray efficiency versus stripping factor [texte imprimé] / Branislav M. Jacimovic, Auteur ; Srbislav B. Genic, Auteur . - 2011 . - pp. 7445-7451. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 12 (Juin 2011) . - pp. 7445-7451 Mots-clés : Stripping  Plate  column  Plate  efficiency Résumé : Estimation of the tray (plate) efficiency is the basis of trayed column design. A newly introduced parameter "normalized efficiency" (η) is compared to the stripping factor (λ) in order to derive a correlation which can be useful in engineering practice. The proposed correlation is based on the numerous data gathered from various literature sources describing distillation, absorption, and stripping (desorption) columns and covering sieve, tunnel, bubble-cup, uniflux, and jet trays, in the range λ = 0.0391―2196. The final form of this correlation is with correlation ratio Θ = 0.883 and standard deviation Δav = 13.1%. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24239060