ltrasonic field enhanced extraction of oil can significantly improve the extraction efficiency, improve the quality of oil, save raw materials and increase the amount of oil extracted. Bi Hongwei compared the homogenization method with ultrasonic extraction γ 2 Linolenic acid, the result shows that the oil quantity obtained by ultrasonic method is more, which is 12.8% higher than that by homogenization method, and saves manpower. Extracting peanut oil from peanut can increase the yield of peanut oil by 2.76 times. Gorodenrd et al. used ultrasonic extraction technology to extract oil from sunflower seeds, which increased the yield by 27%~28%. When the amount of cottonseed oil is the same, the amount of cottonseed oil extracted with ethanol is 8.3 times higher than that without ultrasonic treatment if the intensity of ultrasonic treatment is 1.39W/cm2. At present, cod liver oil is mainly extracted by dissolution method, with low oil extraction rate and high temperature causing vitamin damage. Ultrasound can also be used to process and extract animal oil, such as cod liver oil. Soviet scholars used 300, 600, 800, and 1500 kHz ultrasound to extract cod liver oil, which can extract almost all the fat in the tissue within 2 to 5 minutes, and the vitamins contained are not damaged, and the oil quality is better than the traditional method.
Ultrasonic field can not only enhance the extraction process of substances by conventional fluids, but also enhance the extraction process of substances under supercritical conditions. Chen Jun et al. carried out experimental research on the ultrasonic-enhanced supercritical CO2 fluid extraction process. Wheat germ oil was extracted from wheat germ. The extraction rate of wheat germ oil increased by about 10% after the supercritical fluid extraction was added with ultrasonic field, and did not cause the degradation of wheat germ oil. The research and application of ultrasonic extraction in oil extraction is very active. The experiments and applications that have been carried out involve the extraction of star anise oil, almond oil, clove oil, perilla oil, evening primrose oil, etc.
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