A13 円筒型ソノリアクターのソノケミカル効率に対する周波数と液高さの影響

抄録

The sonochemical efficiency of a cylindrical sonochemical reactor has been investigated as a function of frequency and liquid height. The irradiation frequencies were 45, 129, 231 and 490kHz. The liquid height was varied from 10 to 700mm. The sonochemical efficiency of the cylindrical reactor was evaluated by potassium iodide (KI) dosimetry and calorimetry. In our study, the sonochemical efficiency depended on the frequency and liquid height; further, the plots of sonochemical efficiency against liquid height exhibit one or two peaks for each frequency. The sonochemical efficiency up to the first peak increased monotonically with the logarithm of the frequency, and the liquid height for the first peak was inversely proportional to the frequency. The sonochemical efficiency of the cylindrical reactor largely varied with the period of about half wavelength with an aluminium reflector, and increased when the impedance of the transducer decreased. In the case of a free surface at 129kHz, variation in the sonochemical efficiency of the cylindrical reactor was small. From these results, the optimum frequency for a sonochemical reactor can be determined if the liquid height is specified for scale-up of the sonochemical reactor.