17. 超音波照射によるポルフィリン分解反応に及ぼす液流れの影響

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Ultrasonic cavitation is well known to be applicable to the indecomposable waste such as chlorinated hydrocarbons on the waste treatment. The effect of liquid flow behavior on the performance of organic materials decomposition by ultrasonic irradiation was experimentally investigated. The ultrasonic frequency was 22.8 kHz. The sample to be decomposed was porphyrin in aqueous solution. The dimensions of reactor were 40 mm × 240 mm × 140 mm (height). The volumes of samples were changed between 484 and 958 ml. The rotation speed of stirrer or liquid flow rate in the reactor was changed. The porphyrin concentration in the sample was determined by using a UV spectrometer. The sonochemical reaction filed was visualized by the sonic chemi-luminescence of luminol solution. As a measure of liquid mixing behavior, the liquid mixing time in the reactor was measured. With increasing rotation speed of stirrer or with increasing liquid flow rate, the decomposition conversion, which was defined as the ratio of decrement in porphyrin concentration to initial one, increased and the sonochemical reaction field was observed to become larger. From these, it was found that the enhancement of liquid mixing increased the number of cavity which contributed effectively to the decomposition reaction. In spite of the methods of liquid mixing or volumes of samples, the ratio of decomposition conversion, which was defined the ratio of decomposition conversion with liquid mixing to that without liquid mixing, was found to be correlated by the liquid mixing time per unit liquid volume.
日本ソノケミストリー学会の論文

17. 超音波照射によるポルフィリン分解反応に及ぼす液流れの影響

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