The process of subcritical extraction of peony seed oil mainly includes the following steps:
1. Seed cleaning and impurities: In the process of harvesting, drying, packaging, transportation and storage, peony seeds may be mixed with sand, soil, stems and leaves and other debris. Cleaning up these debris can improve the quality and oil yield of peony oil, while reducing wear and tear on extraction and refining equipment and reducing energy consumption.
2. Seed shelling and kernel shell separation: Peeling off the shell of peony seeds can improve the oil yield, reduce oil loss, and improve oil quality and cake quality. This also helps to make full use of the production capacity of extraction and refining equipment, reduce maintenance costs, reduce production power consumption, and facilitate the comprehensive utilization of leather shells.
3. Removal of mildew seeds: During harvesting, drying and storage, some seeds may become moldy and deteriorate due to weather and improper storage. Removing these moldy seeds can improve the quality of the oil.
Subcritical low-temperature extraction: The oil content of peony seeds is about 18% to 28%. Compared with the traditional pressing method, the subcritical low-temperature extraction method has a higher oil yield, and can retain the unsaturated fatty acids and trace active substances with medicinal value in the oil to the greatest extent. This method is at room temperature and 0At a pressure of 4MPa, the butane solvent is used for extraction.