Rahimi Masoud, Shahhosseini Shahrokh, Movahedirad Salman
Process Simulation and Control Research Laboratory, School of Chemical Engineering, Iran University of Science and Technology, 16846 Tehran, Iran.
Process Simulation and Control Research Laboratory, School of Chemical Engineering, Iran University of Science and Technology, 16846 Tehran, Iran.
Ultrason Sonochem. 2017 Nov;39:611-622. doi: 10.1016/j.ultsonch.2017.05.033. Epub 2017 May 24.
A new continuous-flow ultrasound assisted oxidative desulfurization (UAOD) process was developed in order to decrease energy and aqueous phase consumption. In this process the aqueous phase is injected below the horn tip leading to enhanced mixing of the phases. Diesel fuel as the oil phase with sulfur content of 1550ppmw and an appropriate mixture of hydrogen peroxide and formic acid as the aqueous phase were used. At the first step, the optimized condition for the sulfur removal has been obtained in the batch mode operation. Hence, the effect of more important oxidation parameters; oxidant-to-sulfur molar ratio, acid-to-sulfur molar ratio and sonication time were investigated. Then the optimized conditions were obtained using Response Surface Methodology (RSM) technique. Afterwards, some experiments corresponding to the best batch condition and also with objective of minimizing the residence time and aqueous phase to fuel volume ratio have been conducted in a newly designed double-compartment reactor with injection of the aqueous phase to evaluate the process in a continuous flow operation. In addition, the effect of nozzle diameter has been examined. Significant improvement on the sulfur removal was observed specially in lower sonication time in the case of dispersion method in comparison with the conventional contact between two phases. Ultimately, the flow pattern induced by ultrasonic device, and also injection of the aqueous phase were analyzed quantitatively and qualitatively by capturing the sequential images.
为了降低能源和水相消耗，开发了一种新的连续流超声辅助氧化脱硫（UAOD）工艺。在该工艺中，水相注入到喇叭口尖端下方，从而增强了各相的混合。使用含硫量为1550ppmw的柴油作为油相，并使用过氧化氢和甲酸的适当混合物作为水相。第一步，在间歇模式操作中获得了脱硫的优化条件。因此，研究了更重要的氧化参数；氧化剂与硫的摩尔比、酸与硫的摩尔比以及超声处理时间的影响。然后使用响应面法（RSM）技术获得优化条件。之后，在新设计的双隔室反应器中进行了一些对应于最佳间歇条件且以最小化停留时间和水相与燃料体积比为目标的实验，并注入水相以评估连续流操作中的工艺。此外，还研究了喷嘴直径的影响。与两相之间的传统接触相比，在分散法的情况下，特别是在较低的超声处理时间下，观察到脱硫有显著改善。最终，通过捕获连续图像对超声装置诱导的流动模式以及水相的注入进行了定量和定性分析。
