Several Oil Extraction And Oil Refining Process Of Grape Seed

Oil is contained in oil crops, any kind of oils are extracted from oil crops. And mostly vegetable oil extracted from vegetable does not suitable for direct edible, the crude oil need oil refining process. ...

 Oil is contained in oil crops, any kind of oils are extracted from oil crops. And mostly vegetable oil extracted from vegetable does not suitable for direct edible, the crude oil need oil refining process. Different kinds of oil extraction and oil refining process determine the product quality.
Let's take a look at the difference and features between grape seed oil extraction and refining process.

1.Solvent extraction
After drying, crushing, wetting, and then use organic solvent to spray and soak the grape seeds, grape seed oil extracted from the grape seeds. And then we isolated the mixed oil getting grape seed oil.
Solvent extraction making oil method has higher oil yield Solvent extraction is more complete, and the solvent can be recycled. What’s more that is easy to operate, and cost is relatively low. But in the process of solvent easily make unsaturated fatty acid decomposition, making the crude oil saponification value high, and the products with solvent residues.

2. Expression Method
Squeeze the grape to get grape seed without grape peel. And then broke the grape seed after removing impurity. Soften the seed and then put that into oil press for pressing, finally getting the crude oil. Oil expression method is simple, easy for industry production without chemical pollution and easy separation. But at the same time, expression method also exist some questions such as low oil yield, high residual oil content, energy consumption, etc.

3. Overcritical CO2 extraction method.
After drying, crushing grape seeds go into the extraction kettle.Press Carbon dioxide by high-pressure pump,passing through the heat exchanger heating, making it both the diffusivity of a gas and the liquid density supercritical fluid. The fluid goes through the extraction kettle after leaching grape seed oil, into the separation column, after decompression, warming the grape seed oil and carbon dioxide separation. Overcritical CO2 extraction method features: low temperature operation; Avoiding the oxidation of unsaturated fatty acid decomposition; High oil extraction rate. Overcritical CO2 extraction is a new extraction technology developed in recent years. In food, medicine, chemical industry and other fields the method has been widely used.

The three above making oil method only get crude oil. If we want to get edible oil, the crude oil need oil refining process. At present, the general use of grape seed oil refining process is as follows: Degumming, alkali refining, washing, drying, decoloring, deodorization, finally getting the edible oil.