On October 23, the 1,000 tons of soybean pretreatment, leaching and refining oil project contracted by Huatai Group was being shipped one after another.

Soybean oil is obtained from soybean seeds and is the most produced oil in the world. There are many types of soybean oil. According to the processing technology, it can be divided into pressed soybean oil and extracted soybean oil; according to the type of soybean, it can be divided into soybean crude oil and genetically modified soybean oil. The color of soybean crude oil varies depending on the soybean seed coat and soybean varieties. Generally light yellow, slightly green, dark brown, etc. Refined soybean oil is light yellow.

Soybean oil is generally processed through various methods such as pressing (oil press) and leaching (leaching equipment) to obtain crude oil with more impurities, which is then refined to obtain edible refined oil.

Pressed soybean oil adopts a physical pressing process. During the production process, the oil is extracted through physical extrusion without additives. Therefore, the crude oil has high quality, complete color, aroma and taste, retains various nutrients in soybeans, and has a relatively high nutritional value. However, the smoke point of pressed soybean oil is low and the oil yield of pressed soybean oil is not high, so the price is relatively high. However, the pressing process has relatively flexible equipment requirements. Different production line solutions can be configured according to the manufacturer's output, budget, site size, etc., and is suitable for small and medium-sized edible oil processing plants.

Extraction soybean oil uses a solvent to extract the grease. During the leaching process, the solvent and soybean oil form a mixed oil, which needs to be recovered through high-temperature evaporation, stripping, and condensation to separate the solvent and grease. Moreover, there are still solvent residues in the crude oil, which requires refining. The conditions are more stringent than those for pressed oil, but the refined crude oil has fewer impurities, higher purity, and a higher smoke point, making it suitable for high-temperature cooking.

Moreover, the oil yield rate of leached soybean oil is high, so the price is relatively low, and the cake quality after leaching is good, which can be used in industries such as animal feed or protein extraction and processing. However, because extracted soybean oil uses organic solvents to extract the oil from soybeans, most of the nutrients in soybeans are destroyed, and the nutritional value is relatively low compared to pressed soybean oil. In addition, the leaching equipment has large output, high efficiency and high degree of automation, which can save production costs and labor costs for oil plants. Considering that the purchase of equipment is usually a large expense, leaching is usually chosen by large edible oil processing plants. Craftsmanship.

Soybean leaching process requirements:

The basic principles and elements of oil production by leaching method. Oil production by leaching method uses a solvent that can dissolve oil to extract the oil from the embryo through wetting, penetration, molecular diffusion and convection diffusion, and then mixes the solvent and fat. The oil is separated and the solvent is recovered to obtain crude oil. The solvent in soybean meal is also recovered to obtain leached meal. In this process, the basic elements are solvent and material embryo, as well as the leaching method and process parameters that determine the leaching effect.

No matter what process or equipment is used, soybean oil refining equipment needs to carry out a series of refining processes such as dephosphorization, deacidification, decolorization, and deodorization of the crude oil, so that the refined soybean oil can meet the soybean oil standards and enter the market for sale. .

In a complete soybean oil leaching production line, the refining equipment is an important equipment to ensure the quality of soybean oil. The role of refined oil equipment in production is as follows:

1. Refining and removing impurities: Although the extracted soybean crude oil has been desolubilized, there will be slight solvent residues. In addition, mechanical impurities generated during production and the phospholipids, free fatty acids and pollution residues of the oil itself are all required. It is removed through refining equipment to improve quality.

2. Improve color: There are requirements for the color of oil in soybean oil grades. Soybean crude oil needs to remove pigments through a refining and decolorization process to improve the color of soybean oil and obtain soybean oil that has a clear appearance and meets standards.

3. Removal of odor: The beany smell of soybean oil itself is unacceptable to many consumers. In addition, the burnt or white earthy smell formed during production affects the flavor of edible oil, so this part needs to be removed through the deodorization process of refining equipment. The "off-flavor" makes soybean oil palatable to mass consumers.