By broking the wall of powdered oils with ultrasonic, the oil extraction efficiency yield was 65%, which met the need of determining POV.
超声波破壁法提油其提油率可达65%左右，可满足测定要求。
It is practical significant to improve oil extraction efficiency by selecting suitable pretreatment and the squeezing process according to rapeseed inherent characteristics.
根据油菜籽的这些固有特性，选择适宜的预处理方法和压榨工艺对改善油脂的提取效率具有实际意义。
Considering factors of extraction efficiency, oil yield and environmental protection, the ultrasonic extraction and the supercritical carbon dioxide fluid extraction are the appropriate methods.
从提取效率、油的得率及绿色环保几个因素综合考虑，超声波提取法和超临界二氧化碳萃取法是比较理想的两种提取方法。
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