Epoxidation of Cyclohexene with Oxygen in Ultrasound Airlift Loop Reactor

Epoxidation of cyclohexene to cyclohexene oxide was studied in a new type reactor—the ultrasound airlift loop reactor. The influences of ultrasound intensity, molar ratio of isobutyraldehyde to cyclohexene and oxy-gen gas flow rate on the conversion of cyclohexene and selectivity of cyclohexene oxide were investigated and dis-cussed, and the optimal operation condition was found, under which 95.2% conversion of cyclohexene and 90.7% selectivity of cyclohexene oxide were achieved. The ultrasonic airlift loop reactor utilizes the synergistic effect of sonochemsitry and higher oxygen transfer rate. Possible reaction mechanisms were outlined and the reason of ul-trasound promotion of epoxidation reactionwas analyzed.

超声波内环流气升式反应器处理印染废水

采用超声波内环流气升式反应器对某印染厂印染废水进行处理研究。考察了反应时间、臭氧流量、超声声强对印染废水的脱色率及COD去除率的影响。结果表明,随着反应时间的增加,脱色率和COD去除率均增大,最佳反应时间为30 min;脱色率及COD去除率随着臭氧流量的增加而增大,最佳流量为200L/h;超声声强最佳值为0.5 W/cm2,此时脱色率及COD去除率分别为74.8%、35.6%。实验证明,对印染废水的脱色率及COD去除率,超声波内环流气升式反应器处理效果大于超声与臭氧单独作用简单之和,脱色率和COD去除率分别提高了23.0%和6.5%。超声波内环流气升式反应器结合了超声波的声化学作用及内环流气升式反应器供气效率高的特点,发挥了超声波与内环流气升式反应器的协同效应。