QIE Machinery
QIE Machinery
QIE Machinery
QIE Machinery
Complete soybean oil mill plant is usually designed with seeds pretreatment section, oil processing section, oil refining section and oil filling section. According to oil extraction methods, soybean oil production can be divided into mechanical oil pressing and solvent oil extraction. And crude soybean oil extracted from both mechanical or solvent has impurities and should be refined through a series of oil refining process to get edible refined soybean oil.
Brand
QIE
Raw Material
Soybean
Capacity
10-5000TPD
10-5000TPD
Customized Soybean Oil Mill Plant On Demand
Highly Intelligent Production In All Sections
Intelligent
Soybeans can be mixed with impurities during harvest, transportion and storage. Although the soybean is usually cleaned before storage, it will still contain a small number of impurities after the initial cleaning, which cannot meet the requirements of soybean oil extraction. Therefore, soybeans have to be further cleaned after entering oil mill factory to reduce its impurity content to the range required by sobean oil extraction so as to ensure the effect of the oil production process and quality of final soybean oil. Cleaning methods include screening, air selection, specific gravity destoning, magnetic separation, dust removal, etc. The cleaning of soybeans usually requires an array of seeds cleaning machines to remove all the impurities. Sometimes, it doesn't require many unites.
The moisture affects the physical properties of soybeans, such as elasticity, plasticity, mechanical strength, thermal conductivity and tissue structure, which directly affect the effectiveness of soybean oil processing. Moisture also has an impact on the activity of various enzymes in soybeans, which can change the nature of certain components in soybeans, which in turn affects the quality and yield of the soybean oil and its by-products. If the moisture content is too high, soybeans will be dried, usually by convection drying and conduction drying. If the moisture content is too low, it is humidified. Generally, saturated steam and water are mixed and sprayed onto the soybeas that is being transported, which can achieve a better wetting effect and a shorter time for moisture homogenisation.
Before soybean flaking, large soybeans must be crushed into a certain particle for flaking. Soybean crushing increases the surface area, which facilitates the transfer of temperature and moisture when softening, thus improve softening effect. The requirements for soybean crushing are particle size uniformity, no oil, not into a group and less powder. The standard for soybean crushing is 4~6 petals, and power control at no more than 10%~20% mesh. If moisture content is too high, soybeang are not easily crushed and easily flattened, can has oil, which leads unsmooth and low output; Otherwise, the oil-containing powder is easy to adhere together to form a group. Commonly used crushing equipment are rod-toothed crushers, hammer crushers and disc shellers.
Softening is to improve the elasticity of soybeans by adjusting the moisture and temperature of soybeans, so that it has the best conditions for flaking, reducing the powder and sticky roll phenomenon and ensuring the quality of flakes. Softening is mainly used for oilseeds with low oil content, low water content and high shell content with poor physical plasticity and hard texture. Oil content of soybean is low, poor plasticity, so it is generally softened before flaking. Flaking temperature should depend on the level of moisture content of soybeans. Soybean moisture for 13% to 15%, softening temperature is usually mastered in 70 ~ 80 degrees, softening time 15 ~ 30 minutes. Commonly used softening equipment are layer-type softening pot and drum softening pot.
Flaking is to take use of mechanical action to make materials from the granular sheet into flake. The purpose of flaking is to destroy the cellular organisation of materials, to increase the surface area, to shorten the distance of the oil flow, to facilitate the extraction of the oil and to improve the evaporation effect. Flaking is the key to pretreatment and is related to the yield and quality of the oil. The key to soybean flaking lies in the operation of the flaking machine. In order to ensure the quality, the moisture and temperature of the material before flaking should be strictly controlled. Generally, soybean flaking thickness is 0.3mm or less. The flaking equipment can be divided into two categories: inline and flat mills.
Soybean extruding is the process of using extrusion and puffing equipment to convert crushed, flaked or whole oilseeds into porous puffed pellets. Extrusion is a high temperature, short processing process. Commonly used soybean extruders have single screw, twin screw two types, according to the extrusion of moisture content can be divided into wet, dry extrusion two methods. Generally speaking, in the extrusion process, the extrusion temperature can reach about 110 ~ 200 ℃, the residence time in the extruder for 1~3 mins, shortly 5~105 sec. The most important function of soybean extruding is to destroy cell structure for easy oil extraction, blunt all kinds of enzymes, improve the oil yield, increase oil output and reduce solvent loss.
If the pressing method is combined with the leaching method, first pressing to extract part of the oil, and then leaching the pressed cake, the oil yield can be further improved.Accurately control temperature and pressure: During the pressing process, temperature and pressure are key factors affecting the oil yield.Generally speaking, the temperature is controlled at 100℃ - 110℃, and the pressure is adjusted according to the characteristics of soybeans and the performance of the oil pressing equipment, which can make the oil flow out more easily and increase the oil yield.During the solvent extraction process, parameters such as temperature, time and solvent ratio must also be controlled.
The extraction method uses chemical solvents to dissolve the oil in soybeans, and then evaporates the solvent by heating and evaporation to obtain the oil. This method has an oil yield of up to 99% and high production efficiency.The oil obtained by the extraction method is clear in color and has fewer impurities, which is suitable for a variety of food processing and cooking needs. Due to the high oil yield, the production cost of the extraction method is relatively low, and the price of the oil is more affordable.
Crude soybean oil is generally defined as oil extracted by solvent extraction or pressing process that contains certain impurities that are not suitable for consumption (or industry). The main component of crude soybean oil is a mixture of glycerol triglycerides (neutral oil) and non-glycerol ester substances (impurities). Soybean oil refining is to add edible phosphoric acid, sodium hydroxide, decolourisation active white clay and other process auxiliaries, after a series of processes to remove impurities and components affecting the colour, stability and flavour, to improve the quality, flavour and storage stability. Tyical soybean oil refining process is degumming, deacidification, decoloration, deodorization.
After above processes, edible refined soybean oil is produced and can be sale in the market. Generally, edible oil can be packed in PET barrels, glass bottles, tin barrels and so on. Nowadays, cooking oil is generally packaged in PET, which requires low cost and is environmentally friendly. Finished soybean oil packaging machines can be selected according to the output of soybean oil processing plant. The edible oil filling line consists of a blowing machine, air washing machine, edible oil filling machine, edible oil capping and capping machine, edible oil labelling machine, edible oil cartoning machine, edible oil conveyor, edible oil palletizing and handling equipment, etc., which is a complete production line.
We can offer turnkey soybean oil refinery plant solutions from plant layout design, machinery manufacturing, onsite debugging and installing. The production capacity ranges from 5 ton/d up to 1000 ton/day
Degumming Process
Some impurity, such as Phospholipid, gum, and protein, can be dissolved into oil when there is no water, but once there is water in oil, these impurities can be dissolved into water. So, in degumming section of soybean oil refinery plant, we use the hot water to wash crude oil for two-three times to remove these impurities.
Neutralizing/Neutralization Proces
The crude oil is fed into the neutralizer and mixed with small amounts of degumming agent such as phosphoric acid to help remove gums.Free fatty acids are removed from the oil by adding caustic soda and heating it at 60˚ then stirring the mixture. Heating forms soap base, which is then precipitated and collected, and washed with water to remove alkaline particles.
Decolorizing Process
The neutralized oil requires bleaching machine to get rid of colors. This is done by adding the oil in a bleacher machine whereby it is heated to remove any moisture it might have and then mixed with earth bleach and activated carbon. These two properties absorb any colors after which the oil is passed through a filter to separate oil from earth bleach and carbon. The result is golden light oil.
Deodorizing Process
The golden light oil has unpleasant odors which result from materials such as aldehydes, ketones, tocopherols and phenols among other odiferous elements. Deodorizing process of soybean oil refinery plant helps remove these odors by adding the oil in the deodorizer and heating it above at very high temperature and under very high vacuum. This deodorizing process helps get rid of all odors.
QIE Grain and Oil Machinery Co., Ltd
With decades of expertise,QIE Machinery has successfully installed soybean oil production lines worldwide, serving customers in over 100 countries. Our extensive product portfolio includes soybean oil and soybean protein production solutions, as well as customized solutions for specific capacities ranging from small-scale operations to large conglomerate production facilities.
Whether in Asia, Europe, the Americas or Africa, our equipment is tailored to meet local market needs and production challenges. We operate worldwide and customer satisfaction is at the heart of every project we undertake. From initial consultation and design to installation and after-sales service, QIE Machinery ensures that every solution meets the highest standards of quality and efficiency.
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Learn MoreA basic (small to medium-scale) soybean oil mill plant requires:
High-quality soybeans are critical for efficient oil production.
Oil content: 18–22% (varies by variety; high-oil soybeans are preferred for better yield).
Moisture content: 10–12% (too high causes mold; too low reduces press efficiency).
Purity: Less than 2% impurities (stones, dirt, broken seeds) to avoid equipment damage and oil contamination.
Quality: No mold, mycotoxins, or excessive foreign matter. Freshly harvested soybeans (stored properly) yield better oil than old stock.
Soybeans contain 18–22% oil, but actual yield depends on the extraction method:
Refining transforms crude soybean oil (dark, with impurities) into clear, edible oil. Steps include:
Refining is necessary to meet food safety standards, improve stability (resist oxidation), and enhance consumer acceptability (color, taste, odor).
The primary by-product is soybean meal—the solid residue after oil extraction, containing 40–48% protein. It is:
Other by-products:
Mill plants must address waste, emissions, and resource use:
Wastewater: From cleaning and refining, containing organic matter. Treated via settling tanks, biological filtration, or anaerobic digestion to meet discharge standards.
Solid waste: Soybean meal and hulls are recycled as feed or fuel; filter residues are composted.
Emissions: Solvent extraction plants recover hexane (a volatile solvent) to prevent air pollution. Boilers use low-sulfur fuel or biomass (hulls) to reduce greenhouse gases.
Resource efficiency: Water recycling (for cleaning), heat recovery (from solvent evaporation), and energy-efficient motors minimize environmental impact.
Regulations vary by region but typically include:
Food safety certifications: Compliance with FDA (U.S.), FSSAI (India), or EU standards for edible oil, ensuring low contaminants and safe processing.
Environmental permits: For wastewater discharge, air emissions, and waste management.
Safety protocols: Guards on machinery, fire prevention systems (especially in solvent areas), and worker training in handling equipment and chemicals.
Quality control: Regular testing of oil (for purity, acidity, contaminants) and meal (for protein content) to meet market standards.
Business licenses: Registration as a food processor, tax compliance, and adherence to labor laws.
Whether you contact us by phone, email, or leave a message online, we will provide you with comprehensive and high-quality services.
Phone: 0086-13949113983
WhatsApp:
Email: qiea@oilpresses.org
Address: No.352 Lianhua Street, Hightech Industrial Development Zone, , Zhengzhou City,Henan Province, China
