Documents disponibles écrits par cet auteur

Evaporation crystallization of RDX by ultrasonic spray / Jun-Woo Kim in Industrial & engineering chemistry research, Vol. 50 N° 21 (Novembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 21 (Novembre 2011) . - pp. 12186-12193 Titre : Evaporation crystallization of RDX by ultrasonic spray Type de document : texte imprimé Auteurs : Jun-Woo Kim, Auteur ; Moon-Soo Shin, Auteur ; Jae-Kyeong Kim, Auteur Année de publication : 2011 Article en page(s) : pp. 12186-12193 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Crystallization  Evaporation Résumé : Cyclotrimethylene trinitramine (RDX) with size of 0.8 to 2.6 μm was produced by evaporation crystallization of RDX with ultrasonic spray. In the experimental range of the present work, the size of RDX crystals was found to be strongly affected by operating parameters including RDX concentration and furnace temperature. The size of RDX crystals was reduced as RDX concentration decreased and furnace temperature increased. The formation of random-shaped RDX particles due to agglomeration could be explained by coalescence between a crystal-containing droplet and a crystal or a crystal-containing droplet. In the present work, agglomeration was found to be controlled with injection of additives into starting solution: polyvinylpyrrolidone (PVP), which acted as a strong nucleation inhibitor in the crystallization of RDX from acetone, was very effective on the formation of spherical RDX particles. However, when the nucleation promoters such as polyoxyethylene 10 oleoyl ether (Brij 97) and oleylamine were added, highly agglomerated and random-shaped RDX particles were produced. Therefore, it can be concluded that the controlling onset time of nucleation is an important factor to improve crystal shape in evaporation crystallization by ultrasonic spray. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24697536 [article] Evaporation crystallization of RDX by ultrasonic spray [texte imprimé] / Jun-Woo Kim, Auteur ; Moon-Soo Shin, Auteur ; Jae-Kyeong Kim, Auteur . - 2011 . - pp. 12186-12193. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 21 (Novembre 2011) . - pp. 12186-12193 Mots-clés : Crystallization  Evaporation Résumé : Cyclotrimethylene trinitramine (RDX) with size of 0.8 to 2.6 μm was produced by evaporation crystallization of RDX with ultrasonic spray. In the experimental range of the present work, the size of RDX crystals was found to be strongly affected by operating parameters including RDX concentration and furnace temperature. The size of RDX crystals was reduced as RDX concentration decreased and furnace temperature increased. The formation of random-shaped RDX particles due to agglomeration could be explained by coalescence between a crystal-containing droplet and a crystal or a crystal-containing droplet. In the present work, agglomeration was found to be controlled with injection of additives into starting solution: polyvinylpyrrolidone (PVP), which acted as a strong nucleation inhibitor in the crystallization of RDX from acetone, was very effective on the formation of spherical RDX particles. However, when the nucleation promoters such as polyoxyethylene 10 oleoyl ether (Brij 97) and oleylamine were added, highly agglomerated and random-shaped RDX particles were produced. Therefore, it can be concluded that the controlling onset time of nucleation is an important factor to improve crystal shape in evaporation crystallization by ultrasonic spray. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24697536

Preparation of spherical ammonium nitrate particles by melt spray / Jae-Kyeong Kim in Industrial & engineering chemistry research, Vol. 49 N° 24 (Décembre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 24 (Décembre 2010) . - pp. 12632-12637 Titre : Preparation of spherical ammonium nitrate particles by melt spray Type de document : texte imprimé Auteurs : Jae-Kyeong Kim, Auteur ; Seung-Il Choi, Auteur ; Eui Jung Kim, Auteur Année de publication : 2011 Article en page(s) : pp. 12632-12637 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Preparation  Spherical  ammonium Résumé : Spherical ammonium nitrate particles with average diameters of 82-206 μm were produced using the mel spray system built in the present work. The effects of spray pressure and temperature on the size distribution and average diameter of the ammonium nitrate particles were investigated. It was found that increasing the spray pressure at given temperature or increasing the temperature at given pressure enhanced the disintegration of the front edge of the liquid sheet into fine droplets and, thus, slightly reduced the average diameter of the ammonium nitrate particles. X-ray diffraction patterns confirmed all spherical ammonium nitrate particles to be form IV because of a rapid phase transition from form I to form IV. Dombrowski and Johns' equation which is applicable to highly viscous spray fluids, was found to be satisfactory for estimating the Saute diameter of the ammonium nitrate particles. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23692019 [article] Preparation of spherical ammonium nitrate particles by melt spray [texte imprimé] / Jae-Kyeong Kim, Auteur ; Seung-Il Choi, Auteur ; Eui Jung Kim, Auteur . - 2011 . - pp. 12632-12637. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 24 (Décembre 2010) . - pp. 12632-12637 Mots-clés : Preparation  Spherical  ammonium Résumé : Spherical ammonium nitrate particles with average diameters of 82-206 μm were produced using the mel spray system built in the present work. The effects of spray pressure and temperature on the size distribution and average diameter of the ammonium nitrate particles were investigated. It was found that increasing the spray pressure at given temperature or increasing the temperature at given pressure enhanced the disintegration of the front edge of the liquid sheet into fine droplets and, thus, slightly reduced the average diameter of the ammonium nitrate particles. X-ray diffraction patterns confirmed all spherical ammonium nitrate particles to be form IV because of a rapid phase transition from form I to form IV. Dombrowski and Johns' equation which is applicable to highly viscous spray fluids, was found to be satisfactory for estimating the Saute diameter of the ammonium nitrate particles. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23692019