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Determination of mass - transfer coefficient of CO2 in NH3 and CO2 absorption by materials balance in a rotating packed bed / Baochang Sun in Industrial & engineering chemistry research, Vol. 51 N° 33 (Août 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 33 (Août 2012) . - pp. 10949-10954 Titre : Determination of mass - transfer coefficient of CO2 in NH3 and CO2 absorption by materials balance in a rotating packed bed Type de document : texte imprimé Auteurs : Baochang Sun, Auteur ; Haikui Zou, Auteur ; Guangwen Chu, Auteur Année de publication : 2012 Article en page(s) : pp. 10949-10954 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Packed  bed  Material  balance  Gas  absorption  Carbon  dioxide  Mass  transfer  Mass  transfer  coefficient Résumé : More-accurate overall mass-transfer coefficients in a rotating packed bed (RPB) and local mass-transfer coefficients in different regions of the RPB were deduced by the material balance in order to obtain practical volumetric mass-transfer coefficients in the RPB. Experimental studies on the overall volumetric mass-transfer coefficients (KGa) of CO2 in NH3 and CO2 absorption into water in the RPB was carried out under different conditions. The experimental results indicated that there was a great difference between the value of KGa and KGa* attained by different boundary conditions. And it was concluded that an accurate design equation should be adopted to achieve a practical value of KGa in the RPB. It was also found that the KGa of CO2 increased with the increase of rotation speed, liquid volumetric flow rate, gas volumetric flow rate, NH3/CO2 molar ratio, and the decrease of temperature. The KGa of CO2 in the simultaneous absorption process of NH3 and CO2 was 2―6 times higher than that in the single CO2 absorption process. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26286469 [article] Determination of mass - transfer coefficient of CO2 in NH3 and CO2 absorption by materials balance in a rotating packed bed [texte imprimé] / Baochang Sun, Auteur ; Haikui Zou, Auteur ; Guangwen Chu, Auteur . - 2012 . - pp. 10949-10954. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 33 (Août 2012) . - pp. 10949-10954 Mots-clés : Packed  bed  Material  balance  Gas  absorption  Carbon  dioxide  Mass  transfer  Mass  transfer  coefficient Résumé : More-accurate overall mass-transfer coefficients in a rotating packed bed (RPB) and local mass-transfer coefficients in different regions of the RPB were deduced by the material balance in order to obtain practical volumetric mass-transfer coefficients in the RPB. Experimental studies on the overall volumetric mass-transfer coefficients (KGa) of CO2 in NH3 and CO2 absorption into water in the RPB was carried out under different conditions. The experimental results indicated that there was a great difference between the value of KGa and KGa* attained by different boundary conditions. And it was concluded that an accurate design equation should be adopted to achieve a practical value of KGa in the RPB. It was also found that the KGa of CO2 increased with the increase of rotation speed, liquid volumetric flow rate, gas volumetric flow rate, NH3/CO2 molar ratio, and the decrease of temperature. The KGa of CO2 in the simultaneous absorption process of NH3 and CO2 was 2―6 times higher than that in the single CO2 absorption process. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26286469

Ozonation of phenol with O3/Fe(II) in acidic environment in a rotating packed bed / Zequan Zeng in Industrial & engineering chemistry research, Vol.51 N° 31 (Août 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol.51 N° 31 (Août 2012) . - pp. 10509–10516 Titre : Ozonation of phenol with O3/Fe(II) in acidic environment in a rotating packed bed Type de document : texte imprimé Auteurs : Zequan Zeng, Auteur ; Haikui Zou, Auteur ; Xin Li, Auteur Année de publication : 2012 Article en page(s) : pp. 10509–10516 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Ozonation  Phenol Résumé : The treatment of acidic phenolic wastewater by ferrous-catalyzed ozonation (O3/Fe(II)) process in a rotating packed bed (RPB) was studied, and the O3/Fe(II) process was compared with the O3 process. It was observed that the phenol degradation rate in the O3/Fe(II) process was roughly 10% higher than that of O3 process in acidic environment in the RPB. It is also found that the degradation efficiency of phenol was significantly affected by the rotation speed and inlet ozone concentration. Phenol degradation efficiency increased with increasing initial pH of the phenolic solution, rotation speed, and concentrations of the inlet ozone gas, as well as a decreasing liquid flow rate and initial concentrations of phenol. Phenol degradation efficiency reached maximum at a temperature of 25 °C and an initial Fe(II) concentration of 0.4 mM. The result of the contrast experiment showed that the biological oxygen demand/chemical oxygen demand (BOD/COD) of the phenol solution increased from 0.2 to 0.59 after the solution was treated by O3/Fe(II) process. The intermediates of the ferrous-catalyzed ozonation process were identified by gas chromatography/mass spectroscopy (GC/MS), and it is deduced that the pathway of phenol degradation in ferrous-catalyzed ozonation is different from that in ozonation. Hydroquinone and 1,4-benzoquinone were the main intermediates, and a small amount of polymeric intermediates was found in the O3/Fe(II) process. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie300476d [article] Ozonation of phenol with O3/Fe(II) in acidic environment in a rotating packed bed [texte imprimé] / Zequan Zeng, Auteur ; Haikui Zou, Auteur ; Xin Li, Auteur . - 2012 . - pp. 10509–10516. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol.51 N° 31 (Août 2012) . - pp. 10509–10516 Mots-clés : Ozonation  Phenol Résumé : The treatment of acidic phenolic wastewater by ferrous-catalyzed ozonation (O3/Fe(II)) process in a rotating packed bed (RPB) was studied, and the O3/Fe(II) process was compared with the O3 process. It was observed that the phenol degradation rate in the O3/Fe(II) process was roughly 10% higher than that of O3 process in acidic environment in the RPB. It is also found that the degradation efficiency of phenol was significantly affected by the rotation speed and inlet ozone concentration. Phenol degradation efficiency increased with increasing initial pH of the phenolic solution, rotation speed, and concentrations of the inlet ozone gas, as well as a decreasing liquid flow rate and initial concentrations of phenol. Phenol degradation efficiency reached maximum at a temperature of 25 °C and an initial Fe(II) concentration of 0.4 mM. The result of the contrast experiment showed that the biological oxygen demand/chemical oxygen demand (BOD/COD) of the phenol solution increased from 0.2 to 0.59 after the solution was treated by O3/Fe(II) process. The intermediates of the ferrous-catalyzed ozonation process were identified by gas chromatography/mass spectroscopy (GC/MS), and it is deduced that the pathway of phenol degradation in ferrous-catalyzed ozonation is different from that in ozonation. Hydroquinone and 1,4-benzoquinone were the main intermediates, and a small amount of polymeric intermediates was found in the O3/Fe(II) process. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie300476d