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Novel gradient porous ZSM-5 zeolite membrane/PSSF composite for enhancing mass transfer of isopropanol adsorption in a structured fixed bed / Huanhao Chen in Industrial & engineering chemistry research, Vol. 51 N° 51 (Décembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 51 (Décembre 2012) . - pp. 16643–16650 Titre : Novel gradient porous ZSM-5 zeolite membrane/PSSF composite for enhancing mass transfer of isopropanol adsorption in a structured fixed bed Type de document : texte imprimé Auteurs : Huanhao Chen, Auteur ; Huiping Zhang, Auteur ; Ying Yan, Auteur Année de publication : 2012 Article en page(s) : pp. 16643–16650 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Mass  transfer  Adsorption Résumé : A novel gradient porous ZSM-5 membrane/PSSF (paperlike sintered stainless steel fiber) composite was prepared by the wet layup papermaking/sintering technique and a secondary growth process. The effects of crystallization time on the morphology, thickness, and Si/Al ratio of the ZSM-5 membranes were studied. The composites were characterized by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), and N2 adsorption. Adsorption behaviors of isopropanol in structured fixed beds filled with granular activated carbon (GAC) or ZSM-5 particles in the inlet of the bed and ZSM-5/PSSF composites in the outlet of the bed were investigated. Adsorption breakthrough behaviors of isopropanol in fixed beds containing only GAC or ZSM-5 particles were also studied. Theoretical breakthrough curves were predicted using the Yoon–Nelson model and compared with the experimental results. Satisfactory agreement between the theoretical breakthrough curves and the experimental data was obtained. The parameter κ′ (rate constant) of the Yoon–Nelson model was used to reflect the mass-transfer rate of isopropanol in structured fixed beds. All of the results indicate that the mass transfer was obviously enhanced by including ZSM-5/PSSF composites in the outlet of the structured fixed bed. The concept of the length of unused bed (LUB) was also used to analyze the experimental breakthrough curves. The results showed that the utilization of the bed was obviously increased by including ZSM-5/PSSF composites in the outlet of the structured fixed bed. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie302609r [article] Novel gradient porous ZSM-5 zeolite membrane/PSSF composite for enhancing mass transfer of isopropanol adsorption in a structured fixed bed [texte imprimé] / Huanhao Chen, Auteur ; Huiping Zhang, Auteur ; Ying Yan, Auteur . - 2012 . - pp. 16643–16650. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 51 (Décembre 2012) . - pp. 16643–16650 Mots-clés : Mass  transfer  Adsorption Résumé : A novel gradient porous ZSM-5 membrane/PSSF (paperlike sintered stainless steel fiber) composite was prepared by the wet layup papermaking/sintering technique and a secondary growth process. The effects of crystallization time on the morphology, thickness, and Si/Al ratio of the ZSM-5 membranes were studied. The composites were characterized by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), and N2 adsorption. Adsorption behaviors of isopropanol in structured fixed beds filled with granular activated carbon (GAC) or ZSM-5 particles in the inlet of the bed and ZSM-5/PSSF composites in the outlet of the bed were investigated. Adsorption breakthrough behaviors of isopropanol in fixed beds containing only GAC or ZSM-5 particles were also studied. Theoretical breakthrough curves were predicted using the Yoon–Nelson model and compared with the experimental results. Satisfactory agreement between the theoretical breakthrough curves and the experimental data was obtained. The parameter κ′ (rate constant) of the Yoon–Nelson model was used to reflect the mass-transfer rate of isopropanol in structured fixed beds. All of the results indicate that the mass transfer was obviously enhanced by including ZSM-5/PSSF composites in the outlet of the structured fixed bed. The concept of the length of unused bed (LUB) was also used to analyze the experimental breakthrough curves. The results showed that the utilization of the bed was obviously increased by including ZSM-5/PSSF composites in the outlet of the structured fixed bed. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie302609r

Time – frequency analysis based flow regime identification methods for airlift reactors / Lijia Luo in Industrial & engineering chemistry research, Vol. 51 N° 20 (Mai 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 20 (Mai 2012) . - pp. 7104-7112 Titre : Time – frequency analysis based flow regime identification methods for airlift reactors Type de document : texte imprimé Auteurs : Lijia Luo, Auteur ; Ying Yan, Auteur ; Yuanyuan Xu, Auteur Année de publication : 2012 Article en page(s) : pp. 7104-7112 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Bioreactor  Airlift  reactor  Flow  regime Résumé : The flow regime transitions in an airlift reactor were investigated based on pressure fluctuation signals. Two time―frequency analysis methods, i.e., Wigner―Ville distribution and wavelet transform, were used to extract flow regime characteristics from pressure signals. The main frequency derived from the smoothed pseudo-Wigner―Ville distribution of the pressure signal was used to quantify flow regime transitions in the reactor. Two flow regime transition points were successfully detected from the evolution of main frequencies of pressure signals. In addition, the local dynamic characteristics of the pressure signal at different frequency bands were analyzed by use of the wavelet transform. A new flow regime identification method based on the wavelet entropy of the pressure signal was proposed. This method was confirmed to be reliable and efficient to detect flow regime transitions in the reactor. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25925052 [article] Time – frequency analysis based flow regime identification methods for airlift reactors [texte imprimé] / Lijia Luo, Auteur ; Ying Yan, Auteur ; Yuanyuan Xu, Auteur . - 2012 . - pp. 7104-7112. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 20 (Mai 2012) . - pp. 7104-7112 Mots-clés : Bioreactor  Airlift  reactor  Flow  regime Résumé : The flow regime transitions in an airlift reactor were investigated based on pressure fluctuation signals. Two time―frequency analysis methods, i.e., Wigner―Ville distribution and wavelet transform, were used to extract flow regime characteristics from pressure signals. The main frequency derived from the smoothed pseudo-Wigner―Ville distribution of the pressure signal was used to quantify flow regime transitions in the reactor. Two flow regime transition points were successfully detected from the evolution of main frequencies of pressure signals. In addition, the local dynamic characteristics of the pressure signal at different frequency bands were analyzed by use of the wavelet transform. A new flow regime identification method based on the wavelet entropy of the pressure signal was proposed. This method was confirmed to be reliable and efficient to detect flow regime transitions in the reactor. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25925052