Process Enhancement of Supercritical Fluid Extraction Assisted by Ultrasonic Fields

摘要

In order to improve the operation conditions to the supercritical fluid extraction for natural plants, biomaterials, and vegetable seeds processing, the ultrasonic fields were assisted into the supercritical fluid extraction. The supercritical fluid extraction apparatus with ultrasonic field was specially designed and installed. For the Hippophe Rhamnoides L. seed, soybean seed, and liquorice roots extraction, the pressure was 25-30MPa, temperature was 40-50□, and fluid flow rate is 0.2-0.5m~3/h. The frequency of the ultrasonic field was 20-35kHz, and the power was 150W. The product yield can be averagely increased about 16.9-33.2% by adding USFE into SCFE. Comparison the supercritical carbon dioxide extraction results with and without ultrasonic field, it can be found out that the operation pressure can be reduced into 20% or the extraction time can be decreased to 30% when the other parameters were constant with ultrasonic fields. It seams indicate that the ultrasonic field may improve the supercritical fluid extraction process.