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Assessment and modeling of a sequential process for water treatment — adsorption and batch CWAO regeneration of activated carbon / Carine Julcour-Lebigue in Industrial & engineering chemistry research, Vol. 51 N° 26 (Juillet 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 26 (Juillet 2012) . - pp. 8867–8874 Titre : Assessment and modeling of a sequential process for water treatment — adsorption and batch CWAO regeneration of activated carbon Type de document : texte imprimé Auteurs : Carine Julcour-Lebigue, Auteur ; Nguessan Joaquim Krou, Auteur ; Caroline Andriantsiferana, Auteur Année de publication : 2012 Article en page(s) : pp. 8867–8874 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Sequential  process  Adsorption  Carbon Résumé : A new sequential process, AD–OX, for (post)treatment of water polluted by poorly biodegradable organic compounds has been investigated. It is based on hybridizing classical adsorption on a fixed bed of activated carbon (AC) followed by batch wet catalytic oxidation at higher temperature and pressure on the same bed of AC, which is then regenerated in situ. The basic idea is to take advantage of both operations: 1-efficient water purification at room temperature by adsorption, 2-effective concentrated pollutant degradation by batch air oxidation achieving simultaneously AC regeneration. A small fixed bed reactor, 10 mm diameter, 0.18 m long, filled with granular activated carbon and equipped with convenient 3-way valves, may achieve successively the two main steps. Several AD–OX cycles have been performed with a phenol solution to quantify the regeneration of the activated carbon adsorption capacity. Results show that activated carbon is quickly damaged during the first cycles, due to oxidative coupling, but then a quasi-steady state is obtained proving that significant oxidative regeneration has been achieved. A dynamic model of the adsorption step has been first developed, including intraparticle diffusion, liquid–solid external mass transfer, and axial dispersion of the liquid phase. It has been applied to simulate the performance of the regenerated activated carbon. Using oxidation kinetics over this aged carbon and its adsorption isotherm, separately determined in an autoclave at reaction temperature, the oxidation step after several cycles has been simulated including the heating period, where desorption and oxidation simultaneously occur. The proposed model conveniently predicts the complex phenol concentration–time profile and gives insight to the hydrodynamic behavior of the recycle reactor and the role of mass transfer resistances. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie2020312 [article] Assessment and modeling of a sequential process for water treatment — adsorption and batch CWAO regeneration of activated carbon [texte imprimé] / Carine Julcour-Lebigue, Auteur ; Nguessan Joaquim Krou, Auteur ; Caroline Andriantsiferana, Auteur . - 2012 . - pp. 8867–8874. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 26 (Juillet 2012) . - pp. 8867–8874 Mots-clés : Sequential  process  Adsorption  Carbon Résumé : A new sequential process, AD–OX, for (post)treatment of water polluted by poorly biodegradable organic compounds has been investigated. It is based on hybridizing classical adsorption on a fixed bed of activated carbon (AC) followed by batch wet catalytic oxidation at higher temperature and pressure on the same bed of AC, which is then regenerated in situ. The basic idea is to take advantage of both operations: 1-efficient water purification at room temperature by adsorption, 2-effective concentrated pollutant degradation by batch air oxidation achieving simultaneously AC regeneration. A small fixed bed reactor, 10 mm diameter, 0.18 m long, filled with granular activated carbon and equipped with convenient 3-way valves, may achieve successively the two main steps. Several AD–OX cycles have been performed with a phenol solution to quantify the regeneration of the activated carbon adsorption capacity. Results show that activated carbon is quickly damaged during the first cycles, due to oxidative coupling, but then a quasi-steady state is obtained proving that significant oxidative regeneration has been achieved. A dynamic model of the adsorption step has been first developed, including intraparticle diffusion, liquid–solid external mass transfer, and axial dispersion of the liquid phase. It has been applied to simulate the performance of the regenerated activated carbon. Using oxidation kinetics over this aged carbon and its adsorption isotherm, separately determined in an autoclave at reaction temperature, the oxidation step after several cycles has been simulated including the heating period, where desorption and oxidation simultaneously occur. The proposed model conveniently predicts the complex phenol concentration–time profile and gives insight to the hydrodynamic behavior of the recycle reactor and the role of mass transfer resistances. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie2020312

Measurements and modeling of wetting efficiency in trickle-bed reactors / Carine Julcour-Lebigue in Industrial & engineering chemistry research, Vol. 48 N° 14 (Juillet 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 14 (Juillet 2009) . - pp. 6811–6819 Titre : Measurements and modeling of wetting efficiency in trickle-bed reactors : liquid viscosity and bed packing effects Type de document : texte imprimé Auteurs : Carine Julcour-Lebigue, Auteur ; Frédéric Augier, Auteur ; Harold Maffre, Auteur Année de publication : 2009 Article en page(s) : pp. 6811–6819 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Liquid  viscosity  Wetting  efficiency Résumé : An experimental parametric study on wetting efficiency is reported which evaluates the influence of liquid viscosity, as well as the effect of particle size(/shape) and bed porosity (εB), separately. A 10-fold increase of liquid viscosity improves slightly catalyst wetting (by about 10%), while an increase of either bed porosity or particle size has the opposite effect. Wetting efficiency is reduced by about 0.1 for an increase of εB from 0.38 and 0.40 due to a change of particle size from 1.8 to 7 × 10−3 m while the decrease is only 0.05 for a similar variation of εB (0.38−0.41) with the same particles. The effect of particle shape (cylindrical/trilobe extrudates or spheres) appears very small in the investigated conditions. A new correlation for wetting efficiency is proposed, using a bounded function and only three dimensionless groups (liquid Froude and Morton numbers and bed porosity). This correlation is able to predict wetting efficiency with a very good precision on a large database, provided wetting liquids are used. Adding fines in the fixed bed is also examined, and its positive effect can be correlated with the size ratio between catalyst particles and fines. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9002443 [article] Measurements and modeling of wetting efficiency in trickle-bed reactors : liquid viscosity and bed packing effects [texte imprimé] / Carine Julcour-Lebigue, Auteur ; Frédéric Augier, Auteur ; Harold Maffre, Auteur . - 2009 . - pp. 6811–6819. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 14 (Juillet 2009) . - pp. 6811–6819 Mots-clés : Liquid  viscosity  Wetting  efficiency Résumé : An experimental parametric study on wetting efficiency is reported which evaluates the influence of liquid viscosity, as well as the effect of particle size(/shape) and bed porosity (εB), separately. A 10-fold increase of liquid viscosity improves slightly catalyst wetting (by about 10%), while an increase of either bed porosity or particle size has the opposite effect. Wetting efficiency is reduced by about 0.1 for an increase of εB from 0.38 and 0.40 due to a change of particle size from 1.8 to 7 × 10−3 m while the decrease is only 0.05 for a similar variation of εB (0.38−0.41) with the same particles. The effect of particle shape (cylindrical/trilobe extrudates or spheres) appears very small in the investigated conditions. A new correlation for wetting efficiency is proposed, using a bounded function and only three dimensionless groups (liquid Froude and Morton numbers and bed porosity). This correlation is able to predict wetting efficiency with a very good precision on a large database, provided wetting liquids are used. Adding fines in the fixed bed is also examined, and its positive effect can be correlated with the size ratio between catalyst particles and fines. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9002443