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Peony seed oil contains 20% ~ 25% oil, peony seed oil contains a lot of unsaturated fatty acids, mainly linolenic acid, oleic acid and linoleic acid, the content of more than 90%. The fatty acid composition of peony seed oil is reasonable, and it is an excellent functional edible oil. The extraction methods of peony seed oil include traditional pressing, leaching, subcritical low temperature extraction and carbon dioxide supercritical extraction. The oil yield of the pressing method is low, the impurity content is high, and the high temperature is formed in the extrusion process, which destroys the unsaturated fatty acids in the oil. There are solvent residues in the products produced by the common organic solvent extraction method. The supercritical CO2 extraction technology is used to produce peony seed oil. Although non-toxic and odorless CO2 is used as the extraction agent, the separation of peony seed and oil can be achieved without solvent residue, and it is easy to meet the hygienic standard. However, the operation pressure of this process is high (25 ~ 30 MPa), the one-time investment of equipment is large, and the production cost is high.
The sub-critical low temperature extraction technology of peony seed oil, invented by Mr. Qi Kun, chairman of Henan Sub-Critical Company, makes up for the shortcomings of the above production process. Subcritical (the main solvent is butane, propane) extraction technology, is a new extraction technology in food processing industry, with low boiling point of solvent, gas under normal temperature and pressure, easy to volatilizing characteristics. Subcritical extraction of peony seed oil is to extract and separate peony seed oil from raw materials by using its characteristics.
Advantages of Subcritical Oil Extraction Machine
Subcritical extraction is the drawing out of active substance from natural plants, animals and any other bio material. Pressure of approximately 0.3-0.8 MPa is used in the extraction process using the gaseous agent that turns fluid In such kind of pressure. The state is necessary as it increases permeability, transfer rate and dissolving capability. It has proved effective and efficient in the extraction of oils such as essential and solvent extraction oils; also the plant proteins and natural pigments.
Low Temperature Solvent Extraction Process
Capacity range: 0.1~200 T/D
How Subcritical Extraction is Better than Traditional Solvent Extraction?
It ensures the residual solvent is
them of high and better quality than those which traditional oil mill was used on. Solvent needed for processing is less than 8kg way lower than what could have been spent in traditional solvent extraction.
Great deal of energy is saved because steam is not necessary. Subcritical extraction is the best when it comes to extraction of precious oil, vegetable protein or natural pigment. It has high extraction ratio as compared to the traditional method. The environment is well catered for. There is zero pollution due to discharge.
How Subcritical is Better than Supercritical Extraction?
The word "super" before supercritical does not necessarily make supercritical extraction better than subcritical in any way. On the contrary, it still retains the benefits of supercritical extraction and beats it further on the following:
· You need less capital investment to start it.
· You will incur lower production costs as compared to when you were running supercritical.
· It makes it easier to run it even in a larger industrial scale.
· Less pressure required which translates to lower cost of equipment needed.
· The less pressure also comes in handy in terms of industrialization scale production with which would not be possible in supercritical extraction.
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