Shinichi Matsuzaki, Toshihiro Okitsu, Kiyoshi Ouchi, Katsuto Otake, Takehiro Matsunaga, and Shuzo Fujiwara
松崎伸一,沖津敏洋,大内清司,大竹勝人,松永猛裕,藤原修三
p.436-442
Abstract
This report provides micronization process of cyclotrimethylenetrinitramine (RDX) with using supercritical carbon dioxide (scCO2) as anti-solvent. In the process, RDX solution (RDX/cyclohexanone or RDX/acetone) and scCO2 were introduced into the precipitation cell through a coaxial double tube. The effect of process parameters such as pressure, temperature, the flow rate of scCO2 and the solution, and the inner diameter of the coaxial double tube were examined to control the shape and the size of RDX crystal. Plate-like, needle-like, granular, and irregular shaped RDX crystals were obtained with changing the arrangement of the external and the internal tube that compose the coaxial double tube, and controlling the process parameters. The mean particle size of RDX crystal has been controlled within the range from 2 to 10 μm, and it depended on the flow rate of scCO2 and the clearance between the external and the internal tubes that compose the coaxial double tube. Experimental results were discussed from the viewpoint of mass transfer, vapor-liquid equilibrium, and Reynolds number.
本研究は,超臨界二酸化炭素(scCO2) を貧溶媒として用いたシクロトリメチレントリニトラミン(RDX) の微粒子化法について報告する。本法では,RDX溶解液(RDX / シクロヘキサノン又はRDX / アセトン)とscCO2は, 同軸二重管を通して沈殿セルに導入された。RDX結晶形状やサイズを制御するために,圧力,温度,scCO2 と溶解液の流量比,および同軸二重管の内径のようなプロセスパラメーターの影響を検討した。板状,針状,粒状,および不規則形状のRDX結晶は, 同軸二重管を構成する外部管と内部管の配置の変更やプロセスパラメーターを制御することで得られた。RDX結晶の平均粒子径は,2から10 μmの範囲で制御され,scCO2の流速や同軸二重管を構成する外部管と内部管のクリアランスに依存した。実験結果を物質移動,気液平衡,およびレイノルズ数の観点から考察した。
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