The DTDC (Desolventizer-Toaster-Dryer-Cooler) is a critical component in any solvent extraction plant. After oil is extracted from oilseeds using solvents such as n-hexane, the remaining wet meal contains 25-35% solvent that must be removed before the meal can be used as animal feed or for other applications. Huatai's DTDC desolventizer-toaster efficiently removes residual solvent, dries, and cools the meal in one integrated system.
How the DTDC System Works
The DTDC machine consists of multiple layers, each with specific functions. The pre-desolventizing layer uses indirect steam heating to begin solvent removal. The desolventizing layer injects direct steam for thorough solvent stripping. The drying layer uses hot air circulation to reduce meal moisture. Finally, the cooling layer uses ambient air to bring meal temperature to 5-10°C above ambient for safe storage.
Each layer features automatic material level control to ensure optimal processing conditions. The material is stirred continuously as it passes through each stage, ensuring uniform treatment and complete solvent removal.
Key Benefits of Huatai DTDC Equipment
- Superior Desolventizing Performance
The unique vapor-permeable tray design allows secondary steam from the desolventizing layer to fully exchange heat with the pre-desolventized material. This design saves steam consumption and reduces the load on the condensing system. After complete desolventizing, residual solvent in the meal is minimized, making the meal safe for direct packaging and storage.
Proper desolventizing reduces urease activity to 0.15-0.25 mg nitrogen/g/min. This level indicates adequate heat treatment has deactivated anti-nutritional factors while preserving protein quality. The meal becomes a high-quality ingredient for animal feed formulations.
- Efficient Solvent Recovery
The DTDC system works in conjunction with the plant's solvent recovery loop. Vapors generated during desolventizing are captured and condensed, allowing the solvent to be recycled back to the extraction process. This closed-loop design minimizes solvent consumption and operational costs.
Huatai DTDC units feature high-torque reducers and robust construction for long service life. Automatic feed valves maintain constant material levels in each layer, ensuring sufficient residence time for complete desolventizing.
Huatai offers DTDC equipment for capacities from 100 to 6000 tons per day. The equipment is suitable for processing various oilseeds including soybean, rapeseed, sunflower, cottonseed, rice bran, and corn germ. Custom designs are available for specific capacity requirements.
Why Choose Huatai DTDC?
- Complete Integration – The DTDC is part of a full extraction line that includes extractors, evaporators, stripping towers, and solvent recovery systems.
- Proven Performance – Huatai's DTDC systems are used in oilseed processing plants worldwide, processing soybean, rapeseed, sunflower, cottonseed, rice bran, and corn germ.
- Energy Efficient – The design minimizes steam consumption while maximizing solvent recovery.
- Turnkey Solution – As a National "Little Giant" Enterprise with 38+ years of expertise, Huatai provides complete turnkey solutions including design, manufacturing, installation, and training.
