Chemical Engineering Department, Institute of Chemical Technology, Matunga, Mumbai 40019, India.
Chemical Engineering Department, Siddaganga Institute of Technology, Tumkur 572101, Karnataka, India.
Ultrason Sonochem. 2020 Dec;69:105276. doi: 10.1016/j.ultsonch.2020.105276. Epub 2020 Jul 24.
The present study deals with the size reduction based on the recrystallization (antisolvent approach using water) of 3,3'-Diamino Diphenyl Sulfone (DADPS) using different types of cavitational reactors as an alternative to the conventional process of mechanical size reduction, which is an energy intensive approach. Ultrasound was applied for fixed time specific to the reactors namely ultrasonic probes at different power dissipation levels and also ultrasonic bath. A High Speed Homogenizer was also used at varying speeds of rotation to establishing the efficacy for size reduction. The processed sample was analysed for particle size and morphology using particle size analyser and optical microscopy respectively. The final yield of recrystallization was also determined. The power density in W/L and power intensity in W/m calculated for each equipment has been used to establish efficacy for size reduction since all devices had dissimilar configurations. Based on the studies of varying power intensity of the different US equipment, it was established that larger the power intensity and power density, smaller was the resultant final particle size after treatment for same time. Among the various ultrasonic devices used, Sonics VCX750 probe yielded the best size reduction of 85.47% when operated at 40% amplitude for 60 min for a volume of 200 ml. A High Speed Homogenizer used at 7000 rpm gave 92.35% of size reduction in 15 min operation and also demonstrated the best energy efficiency. The work has elucidated the comparison of different cavitational devices for size reduction for the first time and presented the best reactors and conditions for the desired size reduction.
本研究通过重结晶（水反溶剂法）对 3,3'-二氨基二苯砜（DADPS）进行粒径减小，使用不同类型的空化反应器作为机械粒径减小的替代方法，后者是一种能源密集型方法。超声在特定时间内应用于不同的反应器，即不同功率耗散水平的超声探头和超声浴。还使用高速匀浆器以不同的转速旋转，以确定粒径减小的效果。使用粒径分析仪和光学显微镜分别对处理后的样品进行粒径和形态分析。最终确定重结晶的收率。为了建立减小粒径的效果，计算了每种设备的 W/L 功率密度和 W/m 功率强度，因为所有设备的结构都不同。根据不同 US 设备的功率强度变化研究，确定了在相同时间处理后，功率强度和功率密度越大，最终粒径越小。在所使用的各种超声设备中，当在 40%的振幅下操作 60 分钟，对于 200 毫升的体积，Sonic VCX750 探头的粒径减小效果最好，达到 85.47%。在 7000 rpm 下运行 15 分钟，高速匀浆器的粒径减小率达到 92.35%，同时显示出最佳的能量效率。这项工作首次阐明了不同空化设备在粒径减小方面的比较，并提出了所需粒径减小的最佳反应器和条件。
