Rapeseed oil extraction machine
Rapeseed is a cruciferous plant, born in the area below 3700m above sea level. Annual herbs. The fruit of rapeseed is carob. The carob is composed of three parts: fruit peck, fruit body and fruit stem. After the caryopsis matures, due to the dehydration and shrinkage of the fruit petals, it can automatically crack. The rapeseed is round or oval and consists of three parts: seed coat, embryo and endosperm traces. The chemical composition of seeds is generally nitrogen 3.9%-5.2%, protein 24.6%-32.4%, cellulose 5.7%-9.6%, ash 4.1%-5.3%, oil 37.5%-46.3%.
Rapeseed oil is abbreviated as “rape oil”, which is mainly taken from the seeds of canola rapeseed and Chinese cabbage rapeseed (oil content 22%-49%, average 40%). Contains protein 21%-27%, phospholipid about 1%. These varieties of rapeseed are produced in China, India, Japan, Pakistan, Sweden, Poland, Germany, Chile, France and Canada. In Europe, the source of rapeseed oil is Brassica napus sown in winter. In Pakistan and Canada, the main source of rapeseed oil is summer-seed cabbage-type rapeseed.
China’s rapeseed production has been greatly developed, and the output per mu is constantly increasing. Rapeseed oil output accounts for more than 1/3 of vegetable oil output. In addition to the main producing areas of the Yangtze River and the Pearl River Basin, other regions are also vigorously developing rapeseed cultivation, because it can be planted in winter slack and does not compete with field crops.
The crude oil produced by the rapeseed oil extraction machine is yellowish greenish with an unpleasant smell and spicy taste. The rapeseed oil after alkali refining, decolorization and deodorization is clear and transparent, and the color is light yellow without odor. There is a phenomenon of flavor recovery during storage, but the flavor is different from the original (crude oil).
A few years ago, rapeseed oil was squeezed from cabbage-type rapeseed, and most of the rapeseed grown was cabbage-type rapeseed. After germplasm breeding, the erucic acid content of many varieties is less than 3%, and there are few “green flavors” in the past. The fatty acid composition of rapeseed in different producing areas is very different. Some rapeseeds contain more than 50% oleic acid.
1. From the preparation process, it can be divided into pressed rapeseed oil and leached rapeseed oil.
2. According to whether the raw material is genetically modified, it can be divided into genetically modified rapeseed oil and non-transgenic rapeseed oil.
3. According to the content of erucic acid composed of fatty acids, it can be divided into general rapeseed oil and low erucic acid rapeseed oil.
Generally dark yellow or brown. Rapeseed oil contains arachidic acid 0.4-1.0%, oleic acid 14-19%, linoleic acid 12-24%, erucic acid 31-55%, linolenic acid 1-10%. From the perspective of nutritional value, the human body’s rate of digestion and absorption of rapeseed oil can be as high as 99%, and it has a bile function. When the liver is in a pathological state, rapeseed ketone can also be normally metabolized by the human body. In addition, rapeseed oil contains a small amount of substances such as erucic acid and glucosinolate, which are generally considered to be harmful to human growth and development. If it can be eaten together with good edible oil rich in linoleic acid, its nutritional value will be improved
Pressing method of rapeseed oil extraction machine
The squeezing method, also known as “physical squeezing method”, is to use external force to squeeze out the oil in the oil. It is not suitable for other chemical solvents, etc., to avoid the residual of organic solvents in the oil. The squeezing production process retains the most effective ingredients in rapeseed-polyunsaturated fatty acids and protein, dietary fiber, vitamins, trace elements and other nutrients that are beneficial to the human body, and is more suitable for special supplements for the human body health care.
The first step of the rapeseed oil extraction machine, the cleaning and drying of rapeseed: before entering the oil press, if the soil, stems and leaves and other debris entrained in the rapeseed are not removed, it will not only affect the quality of oil and cake, but also adsorb A part of grease reduces the oil yield. If sand, metal, hemp rope and other debris are contained in the rapeseed, it will also cause wear of the machine parts, induce production accidents, and affect the process effect.
Therefore, in order to ensure the smooth progress of production, it is necessary to remove impurities as much as possible. For rapeseed fruits with high water content, drying treatment is also necessary to facilitate shelling.
The second step of the rapeseed oil extraction machine, heat treatment: heat treatment is one of the most important processes in the process of extracting oil, including the wetting and heating of the green body, which is called steamed or fried in production, and the steamed and fried blank is called Cooked billet. Where green compacts are pressed after heat treatment, they are called hot pressing, and those without heat treatment are called cold pressing. Rapeseed is mainly hot pressed. The effect of heat treatment has a direct impact on the smooth progress of the entire oil production process, the level of oil yield and the quality of oil products and cakes.
Rapeseed oil extraction machine step 3, pressing: the round press bar of the oil press has a zigzag curve and a conical surface. When the rapeseed is pressed, it is pushed and pressed by the snail to make the snail and the inner space of the cage The volume of the press is constantly changing. Because of the arrangement of round press bars at the rear of the press cage, the inner wall of the press cage is zigzag. The blank is alternately pressed and relaxed here, and the structure of the blank is continuously adjusted to be evenly turned so that Oil that has not been squeezed or has less oil is more likely to be fully squeezed.
Leaching method of rapeseed oil extraction machine
The oil produced by the leaching process is also called leaching oil, which is to extract oil with organic solvents (such as gasoline, ethanol, etc.). The leaching method is to use solvent oil (No. 6 light gasoline) to soak the oil and fat raw materials for high temperature extraction. An oil-making process that extracts oil and fat. The “oil” originally extracted is a mixture of organic solvents and fats and oils. It is inedible and must be subjected to a series of refining processes (dewaxing, degumming, dehydration, deodorization, deacidification, decolorization, and other chemical treatments) before it can be consumed. The oil is generally light in color, and the original natural gas in the material seeds has a light or no obvious smell. The extraction process can extract almost all the oil in the oil, and the economic benefit is very high. It is the most popular processing method in the modern oil industry