Mass - transfer behaviors in alcohol solutions in an internal - loop airlift reactor of 5 - m height / Zhonghuo Deng in Industrial & engineering chemistry research, Vol. 50 N° 20 (Octobre 2011)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 50 N° 20 (Octobre 2011) . - pp. 11537–11543 Titre : Mass - transfer behaviors in alcohol solutions in an internal - loop airlift reactor of 5 - m height Type de document : texte imprimé Auteurs : Zhonghuo Deng, Auteur ; Tiefeng Wang, Auteur ; Nian Zhang, Auteur Année de publication : 2011 Article en page(s) : pp. 11537–11543 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Mass transfer Résumé : Gas–liquid mass-transfer behaviors in aqueous alcohol solutions were studied in an internal-loop airlift reactor of 5-m height and 0.28-m i.d. in the superficial gas velocity (Ug) range from 2.0 to 10.0 cm/s. Air and aqueous n-butanol solutions were used as the gas and liquid phases, respectively. It was found that the volumetric mass-transfer coefficient decreased with increasing n-butanol concentration (CA) below a critical CA value of 0.5 wt % and increased with increasing CA above this concentration. To confirm this result, further experiments were also carried out in a bubble column of 0.12-m i.d. at Ug = 6 cm/s, and similar results were obtained. Further analysis showed that the value of kla/αg was independent of the superficial gas velocity and equal to 0.21 1/s in the air–water system; however, it decreased with increasing CA up to 0.25 wt % in n-butanol solutions, and further addition of n-butanol had no effect on kla/αg. A critical CA value of 0.5 wt % was also found for the liquid-side mass-transfer coefficient (kl). Below this concentration, kl decreased with increasing CA, whereas above this concentration, further addition of n-butanol had no effect on kl. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie2001988 [article] Mass - transfer behaviors in alcohol solutions in an internal - loop airlift reactor of 5 - m height [texte imprimé] / Zhonghuo Deng, Auteur ; Tiefeng Wang, Auteur ; Nian Zhang, Auteur . - 2011 . - pp. 11537–11543. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 20 (Octobre 2011) . - pp. 11537–11543 Mots-clés : Mass transfer Résumé : Gas–liquid mass-transfer behaviors in aqueous alcohol solutions were studied in an internal-loop airlift reactor of 5-m height and 0.28-m i.d. in the superficial gas velocity (Ug) range from 2.0 to 10.0 cm/s. Air and aqueous n-butanol solutions were used as the gas and liquid phases, respectively. It was found that the volumetric mass-transfer coefficient decreased with increasing n-butanol concentration (CA) below a critical CA value of 0.5 wt % and increased with increasing CA above this concentration. To confirm this result, further experiments were also carried out in a bubble column of 0.12-m i.d. at Ug = 6 cm/s, and similar results were obtained. Further analysis showed that the value of kla/αg was independent of the superficial gas velocity and equal to 0.21 1/s in the air–water system; however, it decreased with increasing CA up to 0.25 wt % in n-butanol solutions, and further addition of n-butanol had no effect on kla/αg. A critical CA value of 0.5 wt % was also found for the liquid-side mass-transfer coefficient (kl). Below this concentration, kl decreased with increasing CA, whereas above this concentration, further addition of n-butanol had no effect on kl. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie2001988

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