Comparison of Subcritical Fluid Extraction with Other Separation Methods

Subcritical low-temperature extraction technology equipment was originally invented by Qikun in 1992. Due to the technical advantages of low extraction temperature, low extraction pressure, low separation temperature, high extraction efficiency and environmental friendliness, it has been rapidly developed as a method of extracting and separating biological active ingredients in the past 30 years, and is widely used in the fields of industrial processing of vegetable fats and oils, animal fats and oils, essential oils of plants, plant pigments, Chinese herbs, proteins and so on. Industrialization over the past 30 years, built more than 100 sets of scientific research devices, more than 200 sets of large-scale production equipment, and exported to Canada, the United States, India, Indonesia, Thailand, the Philippines, Uzbekistan, Taiwan and other countries and regions, the total amount of materials processed annually to reach 200,000 tons, the technology solves the problem of preservation of heat-sensitive material extraction of natural products, to ensure that the extracts and residues of the nature of the material, which greatly improves the utilization of natural products. Greatly improve the utilization value of natural products. It has created good social and economic benefits.

Currently, the mainstream extraction methods of fat-soluble components mainly include: leaching method, pressing method, supercritical Co2 extraction method, subcritical low-temperature extraction method. The leaching method was firstly invented by E. Deiss (France) in 1856, and industrial production scale has been formed in 1870. The application of oil leaching method fully improves the utilization rate of vegetable oilseeds, and at the same time adapts to the needs of large-scale processing, at present, the scale of a domestic production line can reach more than 5000 tons of soybeans processed on a daily basis, the disadvantage is that the high temperature desolvation of proteins and oil in the trace amount of beneficial organisms in the destruction of the oil; the pressing method is the oldest method of oil production, the investment is small and is suitable for the high oil content of the material, the disadvantage of the oil yield is relatively low; supercritical _CO2 extraction technology, industrialized in the 1970s, it has the advantages of green, environmental protection, low extraction temperature, strong selectivity, and does not destroy heat-sensitive substances, but the equipment scale is small, the investment is large, and the production cost is high. Subcritical low-temperature extraction equipment working pressure of about 0.4MPa, working temperature of 35-50 ℃, both the six solvent leaching method of low-cost, large-scale, and supercritical _CO2 extraction method of high activity, low cost, the current maximum production capacity of a line up to 200 tons / day.