19. 流通系での有機塩素化合物の超音波分解

概要

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The sonochemical degradation of chlorinated hydrocarbons such as 1,1,1-trichloroethane (H_3C-CCl_3), trichloroethylene (HClC = CCl_2) and tetrachloroethylene (Cl_2C = CCl_2) in aqueous solution was carried out using the batch and continuous flow reactor at an ultrasonic frequency of 100 kHz. The ultrasound output power (P_<output>) actually transmitted to the medium is calculated by a calorimetric method and is 62 W (intensity is 0.62 W cm^<-2> ) corresponding to a 44.3 % input power. In the batch experiment, the pseudo-first-order reaction rate constants were H3C - CCl_3 (8.74 × 10^<-2> min^<-1>), HClC = CCl_2 (6.53 × 10^<-2> min^<-1>) and Cl_2C = CCl_2 (8.36 × 10^<-2> min^<-1>). The experiment in the continuous flow reactor was performed in the range of flow rate from 7 to 30 × 10^<-3> L min^<-1>. The conversion rate at a steady state depended on the residence time of the chlorinated hydrocarbon in the reactor. The conversion rate predicted by a model was in fair agreement with that obtained by experiment. In the model, the postulated multi-stage reactor consists of a series of several reactors, and ultrasonic degradation simulated in a three-stage reactor showed good degradation efficiency.
日本ソノケミストリー学会の論文