The wheat germ oil production line mainly processes the crude oil by pressing or leaching, and then refines the refined wheat oil，The oil content of wheat germ is 7-9%, and 4-5% crude wheat germ oil can be extracted by pressing, and the yield of refined oil can be low.

Low temperature extraction of wheat germ oil

Low temperature extraction is used to produce oil, and the entire production process is carried out at low temperatures. The nutritional components of wheat germ oil are not damaged, and the yield is high, resulting in a good oil appearance. It can form large-scale production, with less one-time fixed asset investment, low production costs, and environmental protection and energy conservation.

technological process:

Embryo → Cleaning → Conditioning → Grinding → Embryo Powder → Extraction → Separation → Embryo Cake → Low Temperature Crude Oil → Filtration → Fine Filtration → Refinement → High Grade Embryo Oil

1. Cleaning: The recycled wheat germ contains a large amount of wheat flour, broken flour, and flakes, which need to be screened using a double-layer vibrating screen. Screen mesh, the first layer removes large impurities; The second layer removes powder, crushed grains, and dandruff to reduce the loss of germ.  
2. Drying: In order to maintain the freshness of wet extracted embryos during storage and transportation, the cleaned embryos need to be immediately dried or dried to a moisture content of less than 10%.  
3. Mechanical grinding: Grind the embryo into a particle size of 50 mesh and sieve it.
4. Extraction of crude oil: The ground germ is placed in an extraction solvent at a weight ratio of 1:3, which is ethyl acetate or 1,2-ethylene glycol diacetate. The resulting mixture is filtered, and the filtrate is subjected to rotary separation on a rotary evaporator to remove the extraction solvent and obtain crude oil.
5. Drying and dehydration: Put the filtered liquid into a still and boil it under moderate pressure to dehydrate it, which yields crude oil. The filter residue can be extracted multiple times according to the above process. The obtained crude oil was filtered and refined to obtain satisfactory wheat germ crude oil. If higher grade embryo oil is needed, it can be refined.

Refining process of wheat germ oil

6. Degumming: Colloidal impurities in the crude oil, refined. JPG is mainly composed of phosphorus. The presence of phospholipids and other gelatinous substances not only reduces the quality of the oil, but also promotes a transitional emulsification between the oil and alkali solution during the alkaline refining and deacidification process, increasing the difficulty of soap separation and exacerbating the loss of neutral oil. Therefore, it should be removed thoroughly first.
   Preheat the crude oil to around 60 ℃, then add phosphoric acid with an oil weight of 0.12% and a concentration of 85%. After thorough mixing, add 3% of hot water at 60 ℃ and start stirring at a speed of 55 r/min. When the phospholipid particles form into small particles, slow down the stirring speed to 15 r/min. When the phospholipid points coalesce and show obvious separation, stop stirring and remove the already gelatinous phospholipids to obtain clear degummed oil
7. Deacidification and decolorization: Add alkaline solution to the crude avocado oil obtained, remove the organic solvents in the crude oil, wash with warm water until neutral, adsorb and decolorize to become a colorless liquid, filter, and the filtrate obtained is avocado oil, which appears light yellow.
8. To remove slight odors, at this stage, under appropriate high temperature in vacuum, direct steam distillation is used to remove them.

The advantages of wheat germ oil processing technology

The basic principle of this process is to use the solvent to extract oil seeds (such as rose fruit, evening primrose seeds, marigold granules, grape seeds, wheat germ, etc.) in reverse flow at room temperature and a certain pressure, and then reduce the pressure and vaporize the solvent in the mixed oil (or extract) and meal. The vaporized solvent gas is then compressed, condensed, liquefied by a compressor and recycled for use. Part of the heat absorbed during the solvent vaporization process comes from the system itself, while the other part is supplied by the heating system.

(1) The quality of the leached particles or cake is good, and the original thermosensitive substances are not damaged. If the water soluble protein invariance rate in the meal is greater than 95% and the residual pigment invariance in the particles, further development of plant protein or feed can be achieved; Residual oil less than 1%, residual solubility less than 50ppm;
(2) Low solvent consumption, with a solvent consumption of less than 10kg per ton of raw materials;
(3) No steam is required, only 90 ℃ hot water is needed, which can save 70% of thermal energy compared to solvent No. 6;
(4) There is no “three wastes pollution” in production, which belongs to environmental protection engineering;
(5) Room temperature extraction, low-temperature (less than 40 ℃) desolvation, and almost no damage to heat sensitive substances in the leached oil; The extracted extract has a high yield of pigments, bright colors, and high levels of reflective yellow or spicy red pigments, making it an ideal process for extracting valuable oil and natural pigments with high quality;
(6) Small investment and low production cost (relative to carbon dioxide equipment);
(7) The fourth solvent has a wide range of sources and a low price. This solvent is available in various oil fields and refineries, and its price is lower than that of solvent No. 6.