Use of subcritical CO2 for production of ultrafine particles by pressure reduction of gas-expanded organic liquids / Sameer V. Dalvi in Industrial & engineering chemistry research, Vol. 48 N° 12 (Juin 2009)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 48 N° 12 (Juin 2009) . - pp. 5696–5707 Titre : Use of subcritical CO2 for production of ultrafine particles by pressure reduction of gas-expanded organic liquids Type de document : texte imprimé Auteurs : Sameer V. Dalvi, Auteur ; Mamata Mukhopadhyay, Auteur Année de publication : 2009 Article en page(s) : pp. 5696–5707 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Subcritical carbon dioxide Ultrafine solid particles Drastic reduction Résumé : In this paper we illustrate the use of subcritical carbon dioxide to precipitate ultrafine solid particles. The process has been developed to attain rapid, high, and uniform supersaturation by drastic reduction of the solution temperature and is named PPRGEL (precipitation by pressure reduction of gas-expanded liquids). Rapid pressure reduction over a CO2-expanded liquid solution from 40−70 to 1 bar at 303 K reduces the solution temperature by 30−80 K in a very short span of time (0.5−1.5 min) and facilitates precipitation of ultrafine particles. The process performance has been evaluated for particle production of cholesterol from 100 mL of its acetone and ethanol solutions (5−10 mg/mL) at 40–70 bar and 303 K using a 1 L high-pressure vessel. Particles with a size range of 200 nm to 7 μm and morphologies of near-spherical to needles have been produced with a change in operating conditions. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900132r [article] Use of subcritical CO2 for production of ultrafine particles by pressure reduction of gas-expanded organic liquids [texte imprimé] / Sameer V. Dalvi, Auteur ; Mamata Mukhopadhyay, Auteur . - 2009 . - pp. 5696–5707. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 12 (Juin 2009) . - pp. 5696–5707 Mots-clés : Subcritical carbon dioxide Ultrafine solid particles Drastic reduction Résumé : In this paper we illustrate the use of subcritical carbon dioxide to precipitate ultrafine solid particles. The process has been developed to attain rapid, high, and uniform supersaturation by drastic reduction of the solution temperature and is named PPRGEL (precipitation by pressure reduction of gas-expanded liquids). Rapid pressure reduction over a CO2-expanded liquid solution from 40−70 to 1 bar at 303 K reduces the solution temperature by 30−80 K in a very short span of time (0.5−1.5 min) and facilitates precipitation of ultrafine particles. The process performance has been evaluated for particle production of cholesterol from 100 mL of its acetone and ethanol solutions (5−10 mg/mL) at 40–70 bar and 303 K using a 1 L high-pressure vessel. Particles with a size range of 200 nm to 7 μm and morphologies of near-spherical to needles have been produced with a change in operating conditions. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900132r

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