Process flow of low-temperature subcritical extraction of grape seed oil

The process flow of low-temperature subcritical extraction of grape seed oil mainly includes the following steps
1. Raw material preparation: First collect grape seeds. These grape seeds mainly come from wineries and are by-products in the wine brewing process. After sun-drying, the grape skins and grape stems are separated to obtain pure grape seeds as raw materials.
2. Pretreatment: Grape seeds are cleaned to remove impurities and foreign matter to ensure the purity of the raw materials.
3. Softening and billet rolling: Soften the grape seeds and then roll them into billets for subsequent extraction operations. The thickness and moisture content of the green sheet are precisely controlled. Usually the thickness of the green sheet is kept at about 0.3mm, and the moisture content is about 10%.
4. Low-temperature extraction: Send the processed grape seed flakes to the extraction workshop, and use subcritical butane as the extraction solvent. Under room temperature conditions, multiple extractions are performed through countercurrent extraction, usually three times to fully extract the oil in the grape seeds.
5. Crude oil refining: The extracted grape seed crude oil needs to go through a series of refining processes, including filtration, hydration degumming, deacidification, decolorization and deodorization, dewaxing and fine filtration, to remove impurities and undesirable ingredients. , improve the quality of oil.
6. Refined oil: Refined grape seed oil is the refined oil, which is light green in color and has high quality and good antioxidant activity.
In the entire process, low-temperature subcritical extraction technology is a key step, which can effectively extract grape seed oil at lower temperatures while retaining its nutrients to the greatest extent. This process has the advantages of high oil yield, good oil quality, and low production cost, and is suitable for large-scale production.

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