采用常规、简便的喷射装置,建立了一套超临界溶液快速膨胀(Rapid Expansion of Supercritical Solutions,RESS)实验装置。该装置能有效地防止堵塞。以CO2为溶剂,萘为溶质,考察了喷嘴直径及收集距离对沉积微粒粒径的影响,研究了在不同的...采用常规、简便的喷射装置,建立了一套超临界溶液快速膨胀(Rapid Expansion of Supercritical Solutions,RESS)实验装置。该装置能有效地防止堵塞。以CO2为溶剂,萘为溶质,考察了喷嘴直径及收集距离对沉积微粒粒径的影响,研究了在不同的收集距离时粒径随溶液浓度的变化规律。结果表明喷嘴直径增大将使产物粒子粒径增大;在50mm的范围内,产物粒径随着收集距离的增加而明显增加,结果也显示出RESS产物是通过更小粒子之间的碰撞凝结而生长。当收集距离较大时,晶体的生长过程相比于晶核的形成过程对沉积微粒的粒径影响更大,故粒子粒径随溶液浓度增加而增大;当收集距离较小时,晶核的形成过程占主导地位,因此产物粒径随溶液浓度的增加而减小,符合经典成核理论。展开更多
In this paper a technology of parametric pumping fractional crystallization and a crystallizer with a slug flow vertical bubble tube are presented. This technology and crystallizer are applied to the refining of napht...In this paper a technology of parametric pumping fractional crystallization and a crystallizer with a slug flow vertical bubble tube are presented. This technology and crystallizer are applied to the refining of naphthalene. The purity naphthalene obtained is over 99％ and collection efficiency is over 92.5％．展开更多
文摘采用常规、简便的喷射装置,建立了一套超临界溶液快速膨胀(Rapid Expansion of Supercritical Solutions,RESS)实验装置。该装置能有效地防止堵塞。以CO2为溶剂,萘为溶质,考察了喷嘴直径及收集距离对沉积微粒粒径的影响,研究了在不同的收集距离时粒径随溶液浓度的变化规律。结果表明喷嘴直径增大将使产物粒子粒径增大;在50mm的范围内,产物粒径随着收集距离的增加而明显增加,结果也显示出RESS产物是通过更小粒子之间的碰撞凝结而生长。当收集距离较大时,晶体的生长过程相比于晶核的形成过程对沉积微粒的粒径影响更大,故粒子粒径随溶液浓度增加而增大;当收集距离较小时,晶核的形成过程占主导地位,因此产物粒径随溶液浓度的增加而减小,符合经典成核理论。
文摘In this paper a technology of parametric pumping fractional crystallization and a crystallizer with a slug flow vertical bubble tube are presented. This technology and crystallizer are applied to the refining of naphthalene. The purity naphthalene obtained is over 99％ and collection efficiency is over 92.5％．
