Documents disponibles écrits par cet auteur

Powder micronization using a CO2 supercritical antisolvent type process / Olivier Boutin in Industrial & engineering chemistry research, Vol. 48 N° 12 (Juin 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 12 (Juin 2009) . - pp. 5671–5678 Titre : Powder micronization using a CO2 supercritical antisolvent type process : comparison of different introduction devices Type de document : texte imprimé Auteurs : Olivier Boutin, Auteur ; Thomas Petit-Gas, Auteur ; Elisabeth Badens, Auteur Année de publication : 2009 Article en page(s) : pp. 5671–5678 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : CO2  antisolvent  Recrystallization  processes  Impinging  jets  Concentric  tube  antisolvent  reactor Résumé : Many recrystallization processes in supercritical medium utilize CO2 as antisolvent. This work presents two introduction devices based on the principle of the supercritical antisolvent process: the impinging jets and the concentric tube antisolvent reactor. Those two processes are very simple to develop and allow improving the mixing between the two phases. Some experiments have been conducted for the impinging jets using L-polylactic acid at 10 MPa and 308 K giving spherical particles with average diameter varying from 1.4 to 2.3 μm. For the concentric tube antisolvent reactor, griseofulvin was tested at 10 MPa and temperatures between 308 and 323 K providing needles with lengths between 25 and 50 μm. These results combined with previous ones allow comparing these introduction devices with the classical supercritical antisolvent (SAS) process, demonstrating the following improvements: (i) reduction of particle size, (ii) increase in initial solute concentration, and (iii) process intensification. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8017803 [article] Powder micronization using a CO2 supercritical antisolvent type process : comparison of different introduction devices [texte imprimé] / Olivier Boutin, Auteur ; Thomas Petit-Gas, Auteur ; Elisabeth Badens, Auteur . - 2009 . - pp. 5671–5678. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 12 (Juin 2009) . - pp. 5671–5678 Mots-clés : CO2  antisolvent  Recrystallization  processes  Impinging  jets  Concentric  tube  antisolvent  reactor Résumé : Many recrystallization processes in supercritical medium utilize CO2 as antisolvent. This work presents two introduction devices based on the principle of the supercritical antisolvent process: the impinging jets and the concentric tube antisolvent reactor. Those two processes are very simple to develop and allow improving the mixing between the two phases. Some experiments have been conducted for the impinging jets using L-polylactic acid at 10 MPa and 308 K giving spherical particles with average diameter varying from 1.4 to 2.3 μm. For the concentric tube antisolvent reactor, griseofulvin was tested at 10 MPa and temperatures between 308 and 323 K providing needles with lengths between 25 and 50 μm. These results combined with previous ones allow comparing these introduction devices with the classical supercritical antisolvent (SAS) process, demonstrating the following improvements: (i) reduction of particle size, (ii) increase in initial solute concentration, and (iii) process intensification. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8017803

Supercritical carbon dioxide extraction of molecules of interest from microalgae and seaweeds / Christelle Crampon in Industrial & engineering chemistry research, Vol. 50 N° 15 (Août 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 15 (Août 2011) . - pp. 8941–8953 Titre : Supercritical carbon dioxide extraction of molecules of interest from microalgae and seaweeds Type de document : texte imprimé Auteurs : Christelle Crampon, Auteur ; Olivier Boutin, Auteur ; Elisabeth Badens, Auteur Année de publication : 2011 Article en page(s) : pp. 8941–8953 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Algae  Supercritical  fluid  extraction Résumé : The purpose of this paper is to guide lectors in the extraction of algal (microalgae and seaweeds) compounds using supercritical carbon dioxide (SC-CO2) from dry biomass. It proposes a review of 30 articles dealing with the SC-CO2 extraction of molecules of interest from microalgae and seaweeds. Among these papers, 20 are devoted to microalgae. The most extracted compounds are neutral lipids and antioxidants. Several operating conditions have been tested: pressures from 7.8 to 70 MPa, temperatures from 313.15 to 349.15 K, and CO2/algae mass ratio from 6 to 500. All extraction studies were performed at laboratory scale, with the masses of dry algae powder never exceeding 180 g. Extraction yields vary significantly with operating conditions: pressure seems to be the most influential parameter. The higher the pressure, the higher the yields and/or the faster the extraction kinetics. Temperature also has an influence, but its effect is dependent on pressure (retrograde behavior). Moreover, as expected, it is advised to work with a high CO2/algae mass ratio. From these works, it appears that, to perform an efficient extraction with SC–CO2, the influence of the algae pretreatment is highly significant. The first step is a centrifugation. The resulting concentrated algal suspension must then undergo a drying operation, which is generally freeze-drying or low-temperature drying. Finally, the algae are crushed. Concerning the influence of crushing, the reported results show that, as expected, the smaller the particles, the more rapid the extraction kinetics and/or the higher the yields. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24395840 [article] Supercritical carbon dioxide extraction of molecules of interest from microalgae and seaweeds [texte imprimé] / Christelle Crampon, Auteur ; Olivier Boutin, Auteur ; Elisabeth Badens, Auteur . - 2011 . - pp. 8941–8953. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 15 (Août 2011) . - pp. 8941–8953 Mots-clés : Algae  Supercritical  fluid  extraction Résumé : The purpose of this paper is to guide lectors in the extraction of algal (microalgae and seaweeds) compounds using supercritical carbon dioxide (SC-CO2) from dry biomass. It proposes a review of 30 articles dealing with the SC-CO2 extraction of molecules of interest from microalgae and seaweeds. Among these papers, 20 are devoted to microalgae. The most extracted compounds are neutral lipids and antioxidants. Several operating conditions have been tested: pressures from 7.8 to 70 MPa, temperatures from 313.15 to 349.15 K, and CO2/algae mass ratio from 6 to 500. All extraction studies were performed at laboratory scale, with the masses of dry algae powder never exceeding 180 g. Extraction yields vary significantly with operating conditions: pressure seems to be the most influential parameter. The higher the pressure, the higher the yields and/or the faster the extraction kinetics. Temperature also has an influence, but its effect is dependent on pressure (retrograde behavior). Moreover, as expected, it is advised to work with a high CO2/algae mass ratio. From these works, it appears that, to perform an efficient extraction with SC–CO2, the influence of the algae pretreatment is highly significant. The first step is a centrifugation. The resulting concentrated algal suspension must then undergo a drying operation, which is generally freeze-drying or low-temperature drying. Finally, the algae are crushed. Concerning the influence of crushing, the reported results show that, as expected, the smaller the particles, the more rapid the extraction kinetics and/or the higher the yields. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24395840