Documents disponibles écrits par cet auteur

Adsorption equilibrium and kinetics of water vapor on different adsorbents / Ana M. Ribeiro in Industrial & engineering chemistry research, Vol. 47 N°18 (Septembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N°18 (Septembre 2008) . - p. 7019–7026 Titre : Adsorption equilibrium and kinetics of water vapor on different adsorbents Type de document : texte imprimé Auteurs : Ana M. Ribeiro, Auteur ; Ticiane P. Sauer, Auteur ; Carlos A. Grande, Auteur Année de publication : 2008 Article en page(s) : p. 7019–7026 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Water  vapor  Kinetic  data  Adsorption  equilibrium  Zeolite  Activated  carbon Résumé : Water vapor needs to be removed from many industrial streams using, for example, adsorption processes. Equilibrium and kinetic data are essential for the design of these adsorption processes. In this work, the adsorption equilibrium isotherms of water vapor were measured at 303 K by a gravimetric system on three commercial adsorbents, an activated carbon, an activated alumina, and a zeolite. The zeolite sample presented the highest capacity at low relative pressures, while at pressures near saturation the higher amount adsorbed was obtained on the alumina sample. The experimental points obtained for the activated carbon and the zeolite were fitted with the Virial isotherm while the n-layer BET equation was used in the fitting of the alumina data. The adsorption kinetics was evaluated through the analysis of breakthrough curves obtained at the same temperature for different feed humidity values. The fixed bed behavior was described using an isothermal model that includes axial dispersion and external (film model) and internal (homogeneous LDF model) mass transfer resistances. The homogeneous diffusivity values were determined by adjusting the model to the experimental data. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie701732x [article] Adsorption equilibrium and kinetics of water vapor on different adsorbents [texte imprimé] / Ana M. Ribeiro, Auteur ; Ticiane P. Sauer, Auteur ; Carlos A. Grande, Auteur . - 2008 . - p. 7019–7026. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N°18 (Septembre 2008) . - p. 7019–7026 Mots-clés : Water  vapor  Kinetic  data  Adsorption  equilibrium  Zeolite  Activated  carbon Résumé : Water vapor needs to be removed from many industrial streams using, for example, adsorption processes. Equilibrium and kinetic data are essential for the design of these adsorption processes. In this work, the adsorption equilibrium isotherms of water vapor were measured at 303 K by a gravimetric system on three commercial adsorbents, an activated carbon, an activated alumina, and a zeolite. The zeolite sample presented the highest capacity at low relative pressures, while at pressures near saturation the higher amount adsorbed was obtained on the alumina sample. The experimental points obtained for the activated carbon and the zeolite were fitted with the Virial isotherm while the n-layer BET equation was used in the fitting of the alumina data. The adsorption kinetics was evaluated through the analysis of breakthrough curves obtained at the same temperature for different feed humidity values. The fixed bed behavior was described using an isothermal model that includes axial dispersion and external (film model) and internal (homogeneous LDF model) mass transfer resistances. The homogeneous diffusivity values were determined by adjusting the model to the experimental data. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie701732x

Dual pressure swing adsorption units for gas separation and purification / Carlos A. Grande in Industrial & engineering chemistry research, Vol. 51 N° 25 (Juin 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 25 (Juin 2012) . - pp. 8695-8699 Titre : Dual pressure swing adsorption units for gas separation and purification Type de document : texte imprimé Auteurs : Carlos A. Grande, Auteur ; Richard Blom, Auteur Année de publication : 2012 Article en page(s) : pp. 8695-8699 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Purification  Pressure  swing  adsorption Résumé : This work presents a new application of pressure swing adsorption (PSA) technology. Using the dual PSA concept it is possible to separate a gaseous stream and obtain two high purity products. The dual PSA concept resembles distillation in its spatial distribution with two well-defined subsections: stripping and rectifying. After the gas mixture passes through the stripping section, the most-adsorbed gas is produced with high purity and the less-adsorbed gas is produced as top product from the rectifying section. Stripping and rectifying sections can operate under different operating conditions, have different adsorbents, and, most importantly, have different cycle scheduling. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26066797 [article] Dual pressure swing adsorption units for gas separation and purification [texte imprimé] / Carlos A. Grande, Auteur ; Richard Blom, Auteur . - 2012 . - pp. 8695-8699. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 25 (Juin 2012) . - pp. 8695-8699 Mots-clés : Purification  Pressure  swing  adsorption Résumé : This work presents a new application of pressure swing adsorption (PSA) technology. Using the dual PSA concept it is possible to separate a gaseous stream and obtain two high purity products. The dual PSA concept resembles distillation in its spatial distribution with two well-defined subsections: stripping and rectifying. After the gas mixture passes through the stripping section, the most-adsorbed gas is produced with high purity and the less-adsorbed gas is produced as top product from the rectifying section. Stripping and rectifying sections can operate under different operating conditions, have different adsorbents, and, most importantly, have different cycle scheduling. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26066797

Enhancing capacity of activated carbons for hydrogen purification / Filipe V. S. Lopes in Industrial & engineering chemistry research, Vol. 48 N° 8 (Avril 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 8 (Avril 2009) . - pp. 3978–3990 Titre : Enhancing capacity of activated carbons for hydrogen purification Type de document : texte imprimé Auteurs : Filipe V. S. Lopes, Auteur ; Carlos A. Grande, Auteur ; Ana M. Ribeiro, Auteur Année de publication : 2009 Article en page(s) : pp. 3978–3990 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Steam  methane  reforming  Pressure  swing  adsorption  Activated  carbon Résumé : The commercial technology for the separation of off-gases from steam methane reforming is pressure swing adsorption (PSA). To improve the performance of the PSA units, materials with enhanced capacity toward contaminants are required. In this work, a commercial activated carbon (AC) was used for the preparation of a new material with enhanced capacity toward contaminants (CO2, CH4, CO, and N2). Different samples were prepared by physical activation with CO2 under different operating conditions. The conditions where the sample with the highest microporosity was obtained were reproduced to prepare a scale-up of 400 g. Carbon dioxide, hydrogen, methane, carbon monoxide, and nitrogen adsorption equilibrium and kinetics were studied on the modified AC and compared to the original AC results. An improvement of CO2 adsorption capacity of 17.5% was observed at 303 K and 7 bar. Carbon dioxide micropore diffusivity of same order of magnitude (Dc/rc2 = ∼4 × 10−2 s−1 at 303 K) was observed for both adsorbents. Finally, ternary breakthrough curves (CO2−H2−CH4) were performed for the validation of the multicomponent adsorption equilibrium. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801132t [article] Enhancing capacity of activated carbons for hydrogen purification [texte imprimé] / Filipe V. S. Lopes, Auteur ; Carlos A. Grande, Auteur ; Ana M. Ribeiro, Auteur . - 2009 . - pp. 3978–3990. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 8 (Avril 2009) . - pp. 3978–3990 Mots-clés : Steam  methane  reforming  Pressure  swing  adsorption  Activated  carbon Résumé : The commercial technology for the separation of off-gases from steam methane reforming is pressure swing adsorption (PSA). To improve the performance of the PSA units, materials with enhanced capacity toward contaminants are required. In this work, a commercial activated carbon (AC) was used for the preparation of a new material with enhanced capacity toward contaminants (CO2, CH4, CO, and N2). Different samples were prepared by physical activation with CO2 under different operating conditions. The conditions where the sample with the highest microporosity was obtained were reproduced to prepare a scale-up of 400 g. Carbon dioxide, hydrogen, methane, carbon monoxide, and nitrogen adsorption equilibrium and kinetics were studied on the modified AC and compared to the original AC results. An improvement of CO2 adsorption capacity of 17.5% was observed at 303 K and 7 bar. Carbon dioxide micropore diffusivity of same order of magnitude (Dc/rc2 = ∼4 × 10−2 s−1 at 303 K) was observed for both adsorbents. Finally, ternary breakthrough curves (CO2−H2−CH4) were performed for the validation of the multicomponent adsorption equilibrium. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801132t