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New impeller for viscous fermentation / Yun Lin in Industrial & engineering chemistry research, Vol. 50 N° 6 (Mars 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 6 (Mars 2011) . - pp. 3510-3516 Titre : New impeller for viscous fermentation : power input and mass transfer coefficient correlations Type de document : texte imprimé Auteurs : Yun Lin, Auteur ; Zisheng Zhang, Auteur ; Jules Thibault, Auteur Année de publication : 2011 Article en page(s) : pp. 3510-3516 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Correlation  analysis  Correlation  Mass  transfer  Mass  transfer  coefficient  Fermentation  Agitator Résumé : To mix viscous fermentation broths more efficiently, a new close-clearance impeller, the rotational reciprocating plate impeller (RRPI), was designed to partly mimic the axial reciprocating plate impeller (ARPI). Akin to the axial movement of a reciprocating plate impeller, this new RRPI rotates back and forth driven by a three-arm linkage system. Its power consumption and overall mass transfer coefficient (KLa) were determined in a 22 L laboratory scale bioreactor using model fluids of different viscosities. Results obtained with this new impeller were compared to those of a triple Rushton impeller (TRI) and an ARPI. In water, results were the same as those of the TRI. However, the ARPI gave significantly lower KLa than the other two impellers for the same power input per unit volume. In highly viscous non-Newtonian carboxymethyl cellulose (CMC) solutions, the new impeller showed similar performance as the ARPI, whereas the TRI was not able to provide acceptable mixing due to the presence of stagnant zones. Therefore, this new impeller proves to be a suitable alternative to existing impellers for use in fermentations having rheologically evolving broth. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23944518 [article] New impeller for viscous fermentation : power input and mass transfer coefficient correlations [texte imprimé] / Yun Lin, Auteur ; Zisheng Zhang, Auteur ; Jules Thibault, Auteur . - 2011 . - pp. 3510-3516. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 6 (Mars 2011) . - pp. 3510-3516 Mots-clés : Correlation  analysis  Correlation  Mass  transfer  Mass  transfer  coefficient  Fermentation  Agitator Résumé : To mix viscous fermentation broths more efficiently, a new close-clearance impeller, the rotational reciprocating plate impeller (RRPI), was designed to partly mimic the axial reciprocating plate impeller (ARPI). Akin to the axial movement of a reciprocating plate impeller, this new RRPI rotates back and forth driven by a three-arm linkage system. Its power consumption and overall mass transfer coefficient (KLa) were determined in a 22 L laboratory scale bioreactor using model fluids of different viscosities. Results obtained with this new impeller were compared to those of a triple Rushton impeller (TRI) and an ARPI. In water, results were the same as those of the TRI. However, the ARPI gave significantly lower KLa than the other two impellers for the same power input per unit volume. In highly viscous non-Newtonian carboxymethyl cellulose (CMC) solutions, the new impeller showed similar performance as the ARPI, whereas the TRI was not able to provide acceptable mixing due to the presence of stagnant zones. Therefore, this new impeller proves to be a suitable alternative to existing impellers for use in fermentations having rheologically evolving broth. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23944518