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本文采用改进的恒界面池(Lewis Cell)对以氢氧化三烷基甲铵—煤油为有机相,含银氰化液为水相的萃取体系进行了萃取反应动力学的研究,实验结果表明,萃取反应过程表现为扩散控制,且扩散阻力主要集中在水相。 相似文献
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Microparticle formation and crystallization rate of 1,3,5,7-tetranitro-l,3,5,7-tetraazacyclooctane (HMX) in acetone solution using supercritical carbon dioxide antisolvent (GAS) recrystallization were studied. Scanning electronic microscopy, X-ray diffraction and infrared radiation were used to examine particle size, crystallinity and chemical structure. The results show that β-HMX microparticle in different average size (2--9.5μm) and with narrow size distribution were obtained by controlling the expansibility, expansion speed, initial concentration and temperature during recrystallization of HMX. The formation of nuclei may be a main cause of consumption of solute when the solution is expanded rapidly enough and the equilibrium concentration is lower, in which almost monodisperse microparticle can be obtained. 相似文献
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PURIFICATION OF BILIRUBIN AND MICRO-PARTICLE FORMATION WITH SUPERCRITICAL FLUID ANTI-SOLVENT PRECIPITATION 总被引:1,自引:0,他引:1 下载免费PDF全文
1 INTRODUCTIONA supercritical fluid is one existing at temperatures and pressures above its criticalpoint values(T_c,p_c) [1].Supercritical fluid has unconventional thermophysical prop-erties,exhibiting higher density,greater compressibility,lower viscosity between the gasand liquid extremes.Its solute binary diffusion coefficient is considerably higher thanthat in liquids[2-4].Supercritical fluid extraction(SFE)has been suggested as a viablealternative to other separation technologies. 相似文献
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超临界CO2-GAS重结晶HMX过程温度对晶体形貌的影响 总被引:8,自引:2,他引:6
研究了以丙酮为溶剂的超临界 CO2 - GAS重结晶制细过程温度对 HMX晶型的影响 ,结果表明 :超临界 CO2 - GAS重结晶 HMX过程与常规的重结晶过程相似 ,温度对 HMX晶型起控制作用 ,而对颗粒尺寸影响不大 ;当局部操作温度大于 5 0℃时 ,结晶颗粒中会有α型 HMX生成 ;当整体温度大于 6 0℃时 ,产品中α型 HMX占主要部分。本文就 GAS重结晶过程温度对 HMX晶型影响的机理进行了探讨 ,认为流体压缩和结晶放热引起的局部过热是产生α型 HMX的主要原因 相似文献
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对用季铵盐苹取从氰化液中综合提取金、银、铜新工艺进行了小型工业试验,结果表明:金、银、铜的总收率大于99%,高流比立式混和澄清器的混和性能好,分层速度快且易于操作。本工艺具有能耗低、操作成本省及回收率高的特点,并便于大工业连续化生产。 相似文献
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