引言超声指振动频率高于16千赫(KHz)的声波,作为超声技术应用的器件的频率上限为1兆赫(MHz),但常用的频区为20～50千赫。产生超声的方法很多,但适合于化学过程所需要的功率与频率的超声,多由压电晶体或磁致伸缩元件产生。超声用于有机化学反应的报道,始见于1938年。主要研究用水作共溶剂的条件下,酯类 Introduction Ultrasound refers to sound waves with a vibration frequency higher than 16 kHz. The upper limit of the frequency of the device applied as an ultrasonic technique is 1 megahertz (MHz), but the common frequency range is 20 to 50 kHz. Ultrasound generated by many ways, but for the chemical process required power and frequency ultrasound, mostly by the piezoelectric crystal or magnetostrictive element. Ultrasound for organic chemical reactions reported, first seen in 1938. The main study using water as cosolvent conditions, esters