Abstract
In recent years, ultrasonic atomizers have received much attention in light of their potential practical applications. It has been found that a large amount of mist and/or very small droplets are produced from a solution resulting in a foggy state in the area over a gas (air)-liquid interface at 2.4 MHz. Ultrasonic irradiation was performed from the bottom of the reactor using ultrasonic atomizer (Honda Electric, HM-303N, 2.4 MHz). Sonolysis of several kinds of reactants, such as potassium iodide, pure water, and malonic acid was perfomed using an ultrasonic atomizer at 2.4MHz. Reactions proceeded all the cases. In the case of pure water, however, abnormal rates of products were sometimes obtained under direct irradiation of ultrasound. These phenomena could not observe under indirect irradiations through Pyrex glass although lower yields were obtained. After examination, it might be considered that metal surface on the transducer played a catalyst for degradation of hydrogen peroxide. As another example reaction, sonolysis of malonic acid was carried out. Similar products were obtained compared with 200 kHz transducer. The yield of hydrogen peroxide, however, was lower because of direct irradiation.
