The grape seed oil production line produces high-quality grape seed oil through pressing and refining, with an oil content of 14% to 17%. Grape seed oil contains a large amount of unsaturated fatty acids, and is a linoleic acid type oil. More than 75% of the oil is linoleic acid, which is currently one of the vegetable oils with the highest linoleic acid content. Linoleic acid has the effects of preventing thrombosis, dilating blood vessels, reducing serum cholesterol, and nourishing cells; Grape seed oil also contains a large amount of physiologically active ingredients such as fat soluble vitamins A, D, E, K, etc.

The process of low-temperature subcritical extraction of grape seed oil is as follows

Grape seed → impurity removal → softening → rolling → low temperature extraction → grape seed crude oil → refining → refined oil

Grape seed pretreatment: The main purpose is to remove impurities and destroy the tissue structure of the grape seed, and at the same time make the green sheet have a shape suitable for extraction.

1.Process description: The raw materials are removed through a vibrating screen, and the grape seed peel, pomace and other impurities are removed, and then put into the softening pot through the conveyor, and a certain amount of water is added, and the temperature is raised to 45～55℃, and the temperature is kept for a certain time ( About 15 minutes) for softening, and then put into the billet after iron removal, the billet thickness is 0.3 mm, the moisture content is about 10%, and the billet is sent to the extraction workshop.

2. Low temperature: the extraction solvent is butane, the material-to-solvent ratio is 1:1.2, countercurrent extraction is performed 3 times, and the extraction temperature is room temperature.

3. Crude oil refining: the crude oil obtained is extracted, filtered, hydrated, degummed, deacidified, decolorized, deodorized, dewaxed, and refined to obtain light green finished grape oil.

Pretreatment and pressing of grape seed oil equipment

1, with wind or manpower screening, so that grape seeds do not contain impurities such as skin residue, fruit residue;

2, use a double roller crusher to break all mature grape seeds;

3. Put the crushed grape seeds into the softening pot, put about 15% of soft water, heat up to 65℃-70℃, keep warm for 40 minutes, so that all the broken grape seeds soften;
4. Then transfer it to a skillet for sauting. When operating, the heat must be uniform, so that the material temperature reaches 110 ° C, the moisture is 8%-10%, and the time is about 20 minutes.
5. Immediately after frying, pour into the cake pressing ring to press the cake, so that the middle is thick and the sides are slightly thinner;
   6, while hot into YS hydraulic oil press, cake temperature at 100℃ is good. Stack the cake, the cake stack must be installed straight to prevent stacking;
   7, should be light pressure pressure, so that the oil flow line, workshop temperature is maintained at about 35℃;
6. Install a 2-3 layer filter cloth at the oil outlet to remove impurities such as cake residue.

Grape seed oil refining process

Key points of refining technology

1. Filtration process: Use an oil pump filter to filter grape seed oil to remove solid substances from the oil.
2. Softening process: Raise the oil temperature to 50 ℃, add boiling salt water with a concentration of 0.5-0.7, using 15-20% of the oil amount, and stir while adding. The final temperature is about 80 ℃, until the gel particles are evenly dispersed, and the time is about 15 minutes.
3. Separation process: Keep warm and let it stand for 6-8 hours. Separate when the oil-water separation layer is obvious.
4. Dehydration process: The separated grape seed oil is transferred to a submerged boiler and heated until the oil temperature reaches 105-110 ℃, until there are no water bubbles.
5. Alkali refining process: first, keep the oil temperature between 30~35 ℃, add 30 ° Be soda ash according to 20~50% of the total amount of alkali used to prevent the pan from overflowing, and stir at the speed of 6O rpm. After the foam falls, add 20~22 ° Be soda ash according to 75~80% of the total amount of alkali used, and stir at the final temperature of 80 ℃.
6. Soap removal process: After alkali refining, keep warm and let it stand. Wait until the oil soap separation layer is clear and the soap feet are solid before separating.
7. Washing process: Spray soft water mist at 80-85 ℃ onto the oil surface at a temperature of around 80 ℃, with a water volume of 10% -15% of the oil weight, and continuously stir until it is clean.
8. Drying process: Indirectly heat to 95-105 ℃ for about 10-15 minutes until the water evaporates completely.
9. decolorization process: Treat with a mixture of decolorizing agents such as activated clay and activated carbon under normal pressure and 80-95 ℃ conditions. When operating, it is necessary to stir thoroughly and the time can last for 30 minutes.
10. Filtration process: Filter at a temperature of 70 ° C or filter after natural settling.
11. Deodorization process: Heat the oil in the deodorization tank indirectly with steam to 100 ℃ and spray it directly with steam. The vacuum degree is 800-1000Pa, the time is 4-6 hours, and the steam volume is 40 kg/ton of oil.
12. Add an appropriate amount of antioxidants: Refined grape seed oil has a pale yellow appearance and is crystal clear. After food hygiene testing and analysis of other physical and chemical indicators, the content of water was 0.11%, acid value was 0.22 mg KOH/g, impurities were 0.01%, peroxide value was 0.043%, arsenic was 0.047 mg/L, relative density was 0.92. During the heating test at 280 ℃, the oil color remained unchanged and there were no precipitates. Therefore, it meets the national quality standards for edible oil.
13. Dewaxing process: Due to the presence of wax in grape seed shells, glucose and lipids are also produced during the fermentation process of grape seeds. These substances will not be removed during the refining process mentioned above. After one week of static settling, the grape seed oil is filtered using a special oil filter. After filtration, the grape seed oil is crystal clear and meets the requirements of dewaxing and defatting.