What processing procedures should rapeseed go through before it can become vegetable oil?

Rapeseed oil, commonly known as rapeseed oil (hereinafter referred to as rapeseed oil), is a transparent or translucent liquid obtained after rapeseed (hereinafter referred to as rapeseed oil) is pressed, and its color is golden yellow or brownish yellow. Vegetable oil is one of the main edible oils in China and the third largest vegetable oil in the world. It ranks as the world's four largest oils along with soybean oil, sunflower oil and palm oil.

There are generally two methods to prepare vegetable oil: squeezing method and leaching method. The extrusion method is a physical extrusion method; Leaching method is a method of extracting oil with food-grade solvent according to chemical principle. At present, the oil extraction process is recognized as the most advanced production process in the world.

Rapeseed is washed, crushed, softened, rolled, cooked, fried, squeezed or leached to obtain crude oil, which cannot be eaten directly. When vegetable oil is processed, it is usually squeezed to get oil first, and then the pressed cake is leached to get oil. After degumming, degreasing and dehydration, rapeseed crude oil becomes edible fourth-grade finished vegetable oil, and the fourth-grade vegetable oil becomes refined oil after deacidification, deodorization and decoloration. The refined oil processed by general enterprises is mainly first-class oil, which is mainly sold in the market in the form of small packages. The refined oil of a few enterprises can't meet the first-class standard and becomes second-class and third-class vegetable oil. There are few second-class and third-class oils in the spot market.