Development of ultrasound-assisted supercritical carbon dioxide extraction process for recovery of valuable resources

为了建立高效的超临界CO2萃取工艺，采用自行设计开发的超声波辅助萃取装置，研究了超声波对超临界CO2萃取过程的影响。所有实验都是在不同压力和温度条件下获得的频率-换能器阻抗曲线确定的超声频率下进行的。结果表明，超声辅助提取法比不超声提取法提取率更快。

In the present study, to establish the high efficient supercritical carbon dioxide extraction process, the effect of ultrasonication on supercritical carbon dioxide extraction process was investigated using the ultrasound-assisted extraction apparatus that we had designed and developed. All experiments were carried out at the ultrasonic frequencies determined from respective frequency-transducer impedance curves which were obtained under different pressure and temperature conditions. The results demonstrated that the extraction rate in ultrasound-assisted process was faster compared with that without ultrasonication.