Material Handling & Spraying: Prepared flakes or expanded meal enters drag chain frames, forming a material bed. Solvent is sprayed, establishing a liquid level on the bed.
Leaching & Draining: Chains driven by a transmission slowly push material through isolated frames. This minimizes miscella mixing between stages, maintaining a steep concentration gradient for enhanced mass transfer. Material is dragged over upper/lower grid plates, improving utilization. A mid-process flip enhances leaching uniformity.
Miscella Circulation: Repeated solvent/miscella spraying dissolves oil, forming miscella. Filtered miscella flows to collection hoppers. Concentrated miscella is pumped to holding tanks for evaporation/stripping; dilute miscella recirculates.
Wet Meal Handling: After ~60 mins leaching, spent meal is pushed to the discharge by scrapers and conveyed to the desolventizer.
Excellent Sealing: Fully enclosed design minimizes solvent loss.
Frequency-Controlled Speed: Adjustable chain speed via frequency converter optimizes solvent penetration for different materials.
Independent Leaching Cells (Drag Frames): Prevents miscella cross-flow between stages, maintaining concentration gradients.
Full Counter-Current Flow: Maximizes miscella concentration and leaching efficiency.
Auto-Speed Adjustment: Reduces failure rates and ensures stable operation.
Main drive unit
Tensioning device
Driven unit
Feed hopper
Drag chain with scrapers
Grid plate/screen frame
Feed rate controller
Spraying system
Sight glass flushing device
Enclosed casing
Drive system
Upper/lower miscella hoppers
High Efficiency: Low bed height improves solvent penetration; material flipping loosens/realigns the bed.
Energy Savings: Optimized spraying/draining reduces solvent & energy use.
Stable Operation: Robust design ensures low failure rates.
Safety & Reliability: Sealed enclosure minimizes leakage risks.
This efficient, energy-saving, and reliable leacher is a mainstream choice in oil processing.
