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Auteur Jose A. Quevedo |
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Ajouter le résultat dans votre panier Faire une suggestion Affiner la rechercheIn situ measurements of gas fluidized nanoagglomerates / Jose A. Quevedo in Industrial & engineering chemistry research, Vol. 49 N° 11 (Juin 2010)
Titre : In situ measurements of gas fluidized nanoagglomerates Type de document : texte imprimé Auteurs : Jose A. Quevedo, Auteur ; Robert Pfeffer, Auteur Année de publication : 2010 Article en page(s) : pp. 5263–5269 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Gas Fluidized Résumé : The size of fluidized agglomerates of nanoparticles was successfully measured in situ in conventional and microjet assisted gas fluidized beds by using Lasentec Focused Beam Reflectance Method (FBRM) and Particle Vision Measurement (PVM) probes. In situ particle size distributions and agglomerate images of Aerosil R974 and Aerosil 90 nanopowders were obtained. This was achieved by reducing the electrostatic charge in the fluidized bed by bubbling the gas through an alcohol−water solution before entering the bed. Failure to remove electrostatic charges resulted in blocking of the probe lenses and blurred images or spiky size distributions. The agglomerate size distributions show that Aerosil R974 agglomerates (APF-type nanopowder) are smaller and less dense than Aerosil 90 agglomerates (ABF-type nanopowder). These observations match their respective fluidization behavior and confirm that the APF−ABF classification is dependent on the size and density of the agglomerates. The application of the microjet assisting method results in a further reduction in the mean size and density of the agglomerates and explains the higher quality of fluidization and larger bed expansion observed with the microjet. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9015446
in Industrial & engineering chemistry research > Vol. 49 N° 11 (Juin 2010) . - pp. 5263–5269[article] In situ measurements of gas fluidized nanoagglomerates [texte imprimé] / Jose A. Quevedo, Auteur ; Robert Pfeffer, Auteur . - 2010 . - pp. 5263–5269.
Industrial chemistry
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 49 N° 11 (Juin 2010) . - pp. 5263–5269
Mots-clés : Gas Fluidized Résumé : The size of fluidized agglomerates of nanoparticles was successfully measured in situ in conventional and microjet assisted gas fluidized beds by using Lasentec Focused Beam Reflectance Method (FBRM) and Particle Vision Measurement (PVM) probes. In situ particle size distributions and agglomerate images of Aerosil R974 and Aerosil 90 nanopowders were obtained. This was achieved by reducing the electrostatic charge in the fluidized bed by bubbling the gas through an alcohol−water solution before entering the bed. Failure to remove electrostatic charges resulted in blocking of the probe lenses and blurred images or spiky size distributions. The agglomerate size distributions show that Aerosil R974 agglomerates (APF-type nanopowder) are smaller and less dense than Aerosil 90 agglomerates (ABF-type nanopowder). These observations match their respective fluidization behavior and confirm that the APF−ABF classification is dependent on the size and density of the agglomerates. The application of the microjet assisting method results in a further reduction in the mean size and density of the agglomerates and explains the higher quality of fluidization and larger bed expansion observed with the microjet. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9015446 Exemplaires
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Titre : Removal of oil from water by inverse fluidization of aerogels Type de document : texte imprimé Auteurs : Jose A. Quevedo, Éditeur scientifique ; Gaurav Patel, Éditeur scientifique ; Robert Pfeffer, Éditeur scientifique Année de publication : 2009 Article en page(s) : p. 191-201 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Removal of oil water Hydrophobic aerogel (Nanogel) Résumé : Surface-treated hydrophobic aerogel (Nanogel) granules of sizes between 500 and 850 μm, 1.7 and 2.3 mm, and 0.5 and 2.3 mm are fluidized by a downward flow of oil-contaminated water in an inverse fluidization mode. Aerogel particles are nanostructured, extremely light and porous, have a very large surface area per unit mass, and are sufficiently robust to be fluidized. Their hydrophobic surface gives them a strong affinity for oil and other organic compounds, with the exclusion of water. These desirable properties make them an ideal sorbent or filter media for the removal of oil from wastewater. The hydrodynamic characteristics of inverse fluidized beds of aerogel granules of different size ranges were studied by measuring the pressure drop and bed expansion as a function of superficial velocity. The oil removal efficiency and capacity of the aerogel granules in the inverse fluidized bed were found to depend mainly on the size of the granules, the initial height of the bed (amount of powder used), the void fraction, and the fluid velocity. Among the advantages of the process are the extremely low energy consumption (low pressure drop) during oil removal and the large absorption capacity. Oil concentrations of about 2000 mg/L in water could be reduced to less than 10 mg/L by the inverse fluidization process. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800022e
in Industrial & engineering chemistry research > Vol. 48 N°1 (Janvier 2009) . - p. 191-201[article] Removal of oil from water by inverse fluidization of aerogels [texte imprimé] / Jose A. Quevedo, Éditeur scientifique ; Gaurav Patel, Éditeur scientifique ; Robert Pfeffer, Éditeur scientifique . - 2009 . - p. 191-201.
Chemical engineering
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 48 N°1 (Janvier 2009) . - p. 191-201
Mots-clés : Removal of oil water Hydrophobic aerogel (Nanogel) Résumé : Surface-treated hydrophobic aerogel (Nanogel) granules of sizes between 500 and 850 μm, 1.7 and 2.3 mm, and 0.5 and 2.3 mm are fluidized by a downward flow of oil-contaminated water in an inverse fluidization mode. Aerogel particles are nanostructured, extremely light and porous, have a very large surface area per unit mass, and are sufficiently robust to be fluidized. Their hydrophobic surface gives them a strong affinity for oil and other organic compounds, with the exclusion of water. These desirable properties make them an ideal sorbent or filter media for the removal of oil from wastewater. The hydrodynamic characteristics of inverse fluidized beds of aerogel granules of different size ranges were studied by measuring the pressure drop and bed expansion as a function of superficial velocity. The oil removal efficiency and capacity of the aerogel granules in the inverse fluidized bed were found to depend mainly on the size of the granules, the initial height of the bed (amount of powder used), the void fraction, and the fluid velocity. Among the advantages of the process are the extremely low energy consumption (low pressure drop) during oil removal and the large absorption capacity. Oil concentrations of about 2000 mg/L in water could be reduced to less than 10 mg/L by the inverse fluidization process. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800022e Exemplaires
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