Soybean Pre-treatment Process in Soya Oil Mill

Successful soybean oil production relies not only on oil pressing & oil refining but also on key processes such as conveying and pre-processing. These steps directly determine the quality and production efficiency of the final soya oil product. 

Soybean Oil Pretreament Process in Edible Oil Milling Plant
Soybean Oil Pre-treatment Process in Soybean Oil Mill Plants

The following will delve into the pre-processing of soybean oil, focusing on steps such as soybean oilseed conveying, soybean cleaning, soybean dehulling, and preparation of crude oil materials. It particularly emphasizes the critical soybean oil pre-treatment equipment required at each step in the soybean oil production process.

If you are planning to build a soybean oil processing plant and learn about the process of pre-treating soybeans, the following introduction may be helpful to you!

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[Step by Step Technical Guidance] Soybean Pre-processing Before Oil Extraction 

Soybean pre-processing is applicable not only to oil pressing methods but also to edible oil solvent extraction methods. The main purpose of pre-processing is to clean soybeans and prepare them for the optimal conditions for the next processing step. This includes soybean cleaning→Dehulling & Crushing→softening→pressing/puffing processes.

Soybean Oil Pretreatment Process & Equipment
Soybean Oil Pretreatment Process Flow Chart & Equipment

 

Soybean Cleaning Process: Precise Selection & Adjustment of Cleaning Equipment

The purpose of the soybean cleaning section is to remove impurities such as stones, sand, stems, leaves, and iron contained in soybean raw materials, while selecting out moldy or damaged grains. 
Common cleaning methods include screening, air separation, magnetic separation, and gravity separation.

Soybean Cleaning Equipment Selection & Applicability

SoybeanOil Pre-processing Cleaning machine in Zombabwean Project
Cleaning Machine  in Zimbabwean Soybean Oil Prodution Project

Equipment for the cleaning process includes vibrating screens, gravity stone removers, air separation devices, permanent magnetic drums, etc. During the soybean oil production process, it is necessary to rationally match equipment based on the characteristics of raw materials and processing requirements to ensure the effectiveness and efficiency of cleaning.
Taking a vibrating screen as an example, the following 3 key points are essential to keep in mind when choosing soybean cleaning machinery:

  • 1.Production Scale: According to industry standards, the capacity of vibrating screens in small soybean oil plants is typically between 1-5 tons per hour, medium-sized plants are 5-10 tons, and large plants are over 10 tons.

  • 2.Raw Material Characteristics: The selection of the vibrating screen mesh size should be based on the types and particle sizes of soybean impurities, generally ranging from 0.5-2.0 millimeters.

  • 3.Equipment Structure: Research indicates that using a conical screen structure can enhance the screening efficiency of the vibrating screen and reduce the risk of clogging.

 

Soybean Dehulling & Crushing: Key to Oil Yield with Crusher Optimization

After cleaning, soybeans with large particles need to undergo dehulling and crushing. The main purpose is to achieve the appropriate particle size for subsequent pressing requirements. Additionally, through crushing, the surface area of soybeans increases, facilitating the transfer of temperature and moisture during softening, thereby enhancing the softening effect.

Purposes of Soybean Crushing & Dehulling Process

  •   Enhancing oil extraction rate: The oil content in soybean husks is only 0.6-0.7%, but it can reduce the overall oil yield. Dehulling can effectively increase the oil extraction rate and improve production efficiency.
  •   Improving soybean oil quality: Husks contain high levels of pigments, colloids, and waxes. Dehulling can reduce the content of these impurities, improve the color of crude oil, and enhance oil quality.
  •   Increasing equipment utilization: Oil extraction from husk-covered soybeans can lower the effective production capacity of equipment. The crushing and dehulling process can reduce the burden on the equipment and increase its utilization.
Crushed Soybean Requirements

Uniform particle size

Soybeans are generally crushed into 4-8 segments, and the particle distribution should be uniform to avoid overly large or small particles, ensuring the normal progress of subsequent processes.

No oil leakage

During the crushing process, prevent excessive crushing to avoid premature release of oil, affecting subsequent oil extraction.

No clumping

Crushed soybean particles should not adhere to form clumps, preventing interference with subsequent conveying and processing.

Minimal powder formation

Control crusher parameters to avoid generating excessive fines, reducing energy consumption, and improving oil extraction rate.

Particle size compliance

Adjust the crusher settings according to process requirements to ensure the final particle size meets production process standards.

 

Crusher optimization: Roller crushing, husk separation

 
Soybean Crushing Equipment in Pretreatment Process

Soybean Crushing Equipment in Pretreatment Process

Common soybean crushers are equipped with double-roll crushers, where the toothed roll crushers have different speeds. Through cutting, squeezing, and grinding, these crushers crush large soybeans into particles with a specific size

After crushing, soybeans are separated into kernels and husks based on the different densities of husks and kernels, using air and collision methods according to the production process and product specifications.

Soybean Softening & Flaking Proce​ss: Moisture Control in Soybeans and Optimization of Flaking Effect

  • Softening process: Key pre-processing before flaking, aims to adjust oilseeds to suitable moisture levels.

  • Required Equipment: Softening pots, softening boxes, etc.

  • Soybean Flaking process: Utilizes flaking machines – single-pair roller, double-pair roller, three rollers, and hydraulic pressure roller flaking machines. These machines process soybeans into flakes or crude materials with the desired thickness for subsequent oil extraction.

 

4 Points on Soybean F​laking Technologies

Soybean Oil Seed Flaking Mill at Factory Price

Cost-effective Soybean Oil Seed Flaking Machine for Sale

  • 1. Disrupting oilseed cell structure: Mainly through the rolling effect, the structure of soybean oilseeds is disrupted, allowing oil to be effectively separated from the cells.

  • 2. Thinning oilseeds to a thickness of 0.3-0.35mm: Through rolling, soybean oilseeds are processed into thin slices, making it easier for oil to be released from the embryos, increasing the oil extraction rate and improving production efficiency.

  • 3. Facilitating roasting: Thin embryos after rolling are easier to roast. Thinner embryos have an increased surface area, aiding in uniform heat absorption and improving heat absorption efficiency. 

  • 4. Increasing moisture absorption: The increased surface area of embryos after rolling makes them more prone to absorbing moisture. This is beneficial for subsequent processes such as boiling and roasting, contributing to the formation of better oil quality.

Note: The steaming and puffing stages of soybeans are mentioned in the subsequent soybean oil pressing and soybean oil leaching.>>>>>

The above is the process guidance and equipment selection for the soybean pretreatment stage in the soybean oil production process. To learn more about soybean oil processing and treatment technology and to get a free quote, please fill out the form below to receive professional guidance from ABC Machinery!


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