How the Solvent Extraction Process Works

The solvent extraction process consists of several key steps to ensure optimal oil separation and solvent recovery:

1. Preparation of Raw Material – Oilseeds are cleaned, dehulled (if necessary), and flaked to increase surface area for better solvent penetration.
2. Extraction Process – The prepared flakes or pre-pressed cakes are immersed in a solvent (usually hexane), allowing the oil to dissolve into the solvent, forming a mixture called “miscella.”
3. Separation of Miscella and Meal – The miscella (oil-solvent mixture) is separated from the solid meal.
4. Desolventizing the Meal – The leftover meal still contains traces of solvent, which are removed through a desolventizing-toasting (DT) process, making the meal safe for animal feed.
5. Distillation of Miscella – The miscella undergoes evaporation to separate the solvent from the crude oil. The solvent is then condensed and recycled.
6. Solvent Recovery System – Advanced absorption systems minimize solvent loss, ensuring cost efficiency and environmental safety.
7. Meal Finishing and Packaging – The desolventized meal is cooled and processed for storage or packaging.

Advantages of Solvent Extraction Technology

• High oil yield – over 99% extraction with minimal residual oil in the meal.
• Suitable for low oil seeds – ideal for processing soybeans and other low oil content materials.
• Energy efficient – modern solvent extraction equipment includes heat recovery systems to reduce steam consumption.
• High-quality meal by-products – The desolventized meal has a high protein content and can be used as animal feed.
• Automation and safety – Automated controls reduce labor intensity and ensure safe operation to minimize solvent exposure.

Challenges and Solutions in Solvent Extraction

While solvent extraction is highly efficient, it requires strict control to prevent solvent residue in the final oil product. However, with proper distillation and refining, the residual solvent can be reduced to undetectable levels, ensuring food safety. Additionally, advanced solvent recovery systems minimize environmental impact by capturing and recycling solvent vapors.

KMEC’s Advanced Solvent Extraction Equipment

KMEC is a leading manufacturer of solvent extraction plants, offering cutting-edge technology for high-efficiency oil production. Our solvent extraction equipment is designed for:

• Optimized Heat Utilization – Steam exhaust and heat exchange systems reduce energy consumption.
• Lower Solvent Residue – VRS (Vapor Recovery System) layers minimize solvent loss in meal.
• Efficient Exhaust Gas Treatment – Advanced absorption systems reduce solvent emissions.
• Adaptability – Capable of processing various oilseeds with automated controls for consistent performance.
• Reliable Machinery – Equipped with high-quality pumps and reducers to minimize downtime.

With decades of experience in oil processing, KMEC provides turnkey solvent extraction plants tailored to different production needs. Our expertise ensures high-quality equipment, competitive pricing, and reliable after-sales support.

Why Choose Solvent Extraction Over Mechanical Pressing?

While mechanical pressing (screw pressing) is suitable for small-scale operations, solvent extraction offers:

• Higher oil recovery rates (especially for low-oil seeds).
• Lower residual oil in meal, increasing profitability.
• Better scalability for large industrial production.

For businesses looking to maximize oil yield and efficiency, investing in a solvent extraction plant is the optimal choice.

Contact KMEC for Your Solvent Extraction Needs

Whether you need a complete solvent extraction plant, oil refining equipment, or customized solutions, KMEC delivers reliable machinery with advanced technology. Contact us today to discuss your project requirements and discover how our solvent extraction systems can enhance your oil production process.