1. Equipment Introduction
The tank group extraction equipment for oil processing is Main equipment for medium and small-scale oil production, consisting of extraction tanks, solvent recovery systems, meal desolventizing systems, and miscella treatment systems. Adopting batch-type tank group operation, it is suitable for alternating processing of multiple oil seeds (soybeans, rapeseeds, etc.), featuring a simple structure and flexible operation.
2. Working Principle
Based on the solvent extraction principle (like dissolves like): 6# solvent oil is used to dissolve oil in oilseeds to form miscella. Oil and solvent are separated via distillation/steam stripping (utilizing boiling point differences), the solvent is recovered and recycled, and the meal is desolventized and dried to become a finished product.
3. Main Procedures
- Feeding: Pretreated oilseeds are loaded into leaching tanks and sealed;
- Leaching: Solvent is sprayed/soaked with oilseeds in countercurrent to dissolve oil and form miscella;
- Separation: Miscella is separated into crude oil through evaporation and steam stripping, and the solvent is condensed for recovery;
- Desolventizing: Wet meal is desolventized, then dried and cooled to obtain finished meal;
- Treatment: Tail gas and wastewater are treated up to standard to avoid solvent leakage.
4. Main Advantages
- High oil extraction efficiency, with residual oil rate in oilseeds ≤ 1%;
- Adaptable to multiple oilseeds with flexibly adjustable parameters;
- Solvent recovery rate ≥ 95%, reducing production costs;
- Low equipment investment and operation/maintenance costs, suitable for medium and small production capacities;
- Minimal protein denaturation in meal, ensuring high quality;
- Single tank failure does not affect overall operation, enabling flexible operation.