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Experimental investigation of methane gas production from methane hydrate / Yue Zhou in Industrial & engineering chemistry research, Vol. 48 N° 6 (Mars 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 6 (Mars 2009) . - pp. 3142–3149 Titre : Experimental investigation of methane gas production from methane hydrate Type de document : texte imprimé Auteurs : Yue Zhou, Auteur ; Marco J. Castaldi, Auteur ; Tuncel M. Yegulalp, Auteur Année de publication : 2009 Article en page(s) : pp. 3142–3149 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Large-scale  reactor  vessel  Methane  gas  hydrates  Pure  methane  gas  Deionized  water Résumé : A 72 L large-scale reactor vessel was designed, manufactured, and built to investigate the gas production from methane gas hydrates. Methane hydrates were successfully formed within the reactor using pure methane gas and deionized water in a sand matrix with grain sizes between 100 and 500 μm. Hydrate formation tests resulted in formation at 2.2 °C around 600 psi. Mass balance calculations show that 11% of the pore space volume was occupied by hydrate. Measurements and simulations suggest that hydrate was initially formed at the top section of the reactor followed by formation within the lower part of the sediment. A cooling effect was observed during the dissociation via depressurization experiments, caused by the endothermic dissociation reaction. The observed temperature decrease of the system was between 4.0 and 0.8 °C. During the hydrate dissociation tests, a transition regime showing an increased gas production from 9.5 to 13 L/min within a very narrow range of temperature between −1.6 and −1.2 °C and pressure between 310 and 360 psi was recorded. In addition, the temperature was observed to jump to 0 °C in an extremely short time period. The interpretation of this phenomenon is ice formation in the transition regime where hydrate decomposes to gas and ice instead of gas and liquid. This is the first experimental observation of this phenomenon. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801004z [article] Experimental investigation of methane gas production from methane hydrate [texte imprimé] / Yue Zhou, Auteur ; Marco J. Castaldi, Auteur ; Tuncel M. Yegulalp, Auteur . - 2009 . - pp. 3142–3149. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 6 (Mars 2009) . - pp. 3142–3149 Mots-clés : Large-scale  reactor  vessel  Methane  gas  hydrates  Pure  methane  gas  Deionized  water Résumé : A 72 L large-scale reactor vessel was designed, manufactured, and built to investigate the gas production from methane gas hydrates. Methane hydrates were successfully formed within the reactor using pure methane gas and deionized water in a sand matrix with grain sizes between 100 and 500 μm. Hydrate formation tests resulted in formation at 2.2 °C around 600 psi. Mass balance calculations show that 11% of the pore space volume was occupied by hydrate. Measurements and simulations suggest that hydrate was initially formed at the top section of the reactor followed by formation within the lower part of the sediment. A cooling effect was observed during the dissociation via depressurization experiments, caused by the endothermic dissociation reaction. The observed temperature decrease of the system was between 4.0 and 0.8 °C. During the hydrate dissociation tests, a transition regime showing an increased gas production from 9.5 to 13 L/min within a very narrow range of temperature between −1.6 and −1.2 °C and pressure between 310 and 360 psi was recorded. In addition, the temperature was observed to jump to 0 °C in an extremely short time period. The interpretation of this phenomenon is ice formation in the transition regime where hydrate decomposes to gas and ice instead of gas and liquid. This is the first experimental observation of this phenomenon. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801004z

Preparation of drug nanoparticles using a T - junction microchannel system / Qian-Xia Zhang in Industrial & engineering chemistry research, Vol. 50 N° 24 (Décembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 24 (Décembre 2011) . - pp. 13805–13812 Titre : Preparation of drug nanoparticles using a T - junction microchannel system Type de document : texte imprimé Auteurs : Qian-Xia Zhang, Auteur ; Li-Min Xu, Auteur ; Yue Zhou, Auteur Année de publication : 2012 Article en page(s) : pp. 13805–13812 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Nanoparticles Résumé : Cefuroxime axetil (CFA) drug nanoparticles were prepared by liquid antisolvent precipitation in a microchannel system with a T-shaped junction formed by a main microchannel and a branch. Isopropyl ether as the antisolvent (high flow rate) was usually passed through the main microchannel, and CFA acetone solution as the solvent (low flow rate) was injected into the branch simultaneously. The solvent diffused from the CFA acetone solution stream into the antisolvent phase, which resulted in the supersaturation of CFA and thus led to the rapid precipitation of CFA nanoparticles. The change of the injection phase from CFA acetone solution to isopropyl ether was found to have a significant effect on the formation of CFA nanoparticles owing to the different contact behavior. The morphology and size of CFA nanoparticles were characterized by scanning electronic microscopy (SEM) and particle size distribution (PSD) measurements by laser diffractometry. Furthermore, the effects of CFA acetone solution velocity, antisolvent velocity, overall velocity, and CFA concentration on the particle size and size distribution were experimentally investigated. The as-prepared CFA nanoparticles were amorphous and exhibited a higher dissolution rate than raw CFA. This work suggests that microfluidics might find wide applications in the development and optimization of drug nanoparticles in the newly emerging field of nanomedicine. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201291r [article] Preparation of drug nanoparticles using a T - junction microchannel system [texte imprimé] / Qian-Xia Zhang, Auteur ; Li-Min Xu, Auteur ; Yue Zhou, Auteur . - 2012 . - pp. 13805–13812. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 24 (Décembre 2011) . - pp. 13805–13812 Mots-clés : Nanoparticles Résumé : Cefuroxime axetil (CFA) drug nanoparticles were prepared by liquid antisolvent precipitation in a microchannel system with a T-shaped junction formed by a main microchannel and a branch. Isopropyl ether as the antisolvent (high flow rate) was usually passed through the main microchannel, and CFA acetone solution as the solvent (low flow rate) was injected into the branch simultaneously. The solvent diffused from the CFA acetone solution stream into the antisolvent phase, which resulted in the supersaturation of CFA and thus led to the rapid precipitation of CFA nanoparticles. The change of the injection phase from CFA acetone solution to isopropyl ether was found to have a significant effect on the formation of CFA nanoparticles owing to the different contact behavior. The morphology and size of CFA nanoparticles were characterized by scanning electronic microscopy (SEM) and particle size distribution (PSD) measurements by laser diffractometry. Furthermore, the effects of CFA acetone solution velocity, antisolvent velocity, overall velocity, and CFA concentration on the particle size and size distribution were experimentally investigated. The as-prepared CFA nanoparticles were amorphous and exhibited a higher dissolution rate than raw CFA. This work suggests that microfluidics might find wide applications in the development and optimization of drug nanoparticles in the newly emerging field of nanomedicine. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201291r