Loop Type Extractor: Advanced Solvent Extraction Technology
The loop type extractor is a highly efficient solvent extraction plant designed for large-scale edible oil extraction from oilseeds such as soybean, rapeseed, cottonseed, sunflower seed, corn germ, peanut, and more. Operating on a drag-chain conveyor system with percolation-based filtration, this loop type extractor achieves near-total oil recovery—even from pre-pressed high-oil materials (18–25% residual oil) and direct-extraction low-oil seeds (8–12% oil content).
Unlike traditional extractors, the loop type extractor operates with a percolation-style filtration mechanism, ensuring optimal solvent penetration and maximum oil recovery. The rotating mechanism at the bends of the extractor enhances processing efficiency, while the self-cell solvent spraying system ensures thorough extraction. Additionally, the adjustable-speed discharge system prevents uneven meal distribution, reducing mechanical stress on conveyors and maintaining stable desolventizing performance.
Why Choose a Loop Type Extractor for Solvent Extraction?
In the edible oil industry, solvent extraction is a widely adopted method for maximizing oil yield. While mechanical pressing can recover a portion of oil, solvent extraction plants like the loop type extractor ensure near-complete oil removal using food-grade solvents such as hexane.
Key Features of Loop Type Extractors
- Optimized Chain Drive System – The extractor operates at low rotational speeds, reducing noise and maintenance costs while ensuring smooth, continuous operation.
- Material Turning Mechanism – The design allows materials to turn over twice during extraction, ensuring uniform solvent contact and higher extraction efficiency.
- Shallow Material Layer Processing – Promotes faster solvent drainage, shorter extraction time, and lower residual oil in the meal.
- Automatic Feed Control – Adjusts the extractor’s speed based on material input, maintaining consistent pressure and minimizing solvent vapor leakage.
- Advanced Miscella Circulation – Enhances miscella concentration, reduces fresh solvent consumption, and lowers energy costs in evaporation.
- Modular Construction – Designed in sections for easy transportation and on-site assembly, making it suitable for plants with capacities ranging from 30T/D to 8000T/D.
How Does a Loop Type Solvent Extraction Plant Work?
The solvent extraction process begins when oil-bearing materials enter the extractor. Hexane, a highly effective solvent, dissolves the oil from the meal, forming a mixture called miscella. The oil-free residue, known as meal, is then discharged for further processing.
Key Operational Advantages
- Continuous Processing – The drag-chain conveyor ensures uninterrupted material flow, improving productivity.
- Counter-Current & Co-Current Extraction – Enhances solvent efficiency by maximizing contact between fresh solvent and partially extracted material.
- Complete Material Rotation – Ensures all sides of the material are exposed to solvent, minimizing residual oil content.
- Energy-Efficient Design – A single three-phase motor powers the entire system, reducing operational costs.
Applications of Loop Type Extractors in the Edible Oil Industry
The loop type extractor is widely used in large-scale vegetable oil processing plants for extracting oil from: Soybean, Rapeseed (Canola), Cottonseed, Sunflower Seed, Corn Germ, Peanut, Rice Bran, Flaxseed. Its shallow-layer extraction method makes it particularly effective for materials requiring short extraction times and low residual oil content.
Applications Across Oilseed Types
| Oilseed | Typical Feed Oil % | Residual Oil in Meal | Extraction Time |
|---|---|---|---|
| Soybean | 18–20% | < 0.8% | 60–75 min |
| Rapeseed | 18–22% | < 1.0% | 70–85 min |
| Cottonseed | 18–20% | < 0.9% | 65–80 min |
| Sunflower (pre-pressed) | 18–22% | < 1.2% | 70–90 min |
| Corn Germ | 20–24% | < 1.0% | 65–80 min |
| Rice Bran | 14–18% | < 1.5% | 50–65 min |
All data based on standard hexane at 55–60°C, 1 atm, with flake thickness 0.35 mm.
Economic & Environmental Benefits
A modern solvent extraction plant using a loop extractor typically achieves:
- Total oil recovery > 99% (vs. 85–90% for mechanical pressing alone).
- Steam consumption ≤ 220 kg per ton of seed (with mechanical vapor recompression).
- Electricity ≤ 18 kWh per ton of seed.
- Solvent make-up ≤ 1.2 kg per ton of seed.
These metrics translate to 15–25% lower operating costs than older rotary or belt-type extractors, with payback periods under 18 months for medium-to-large facilities.
Why HuaTai’s Loop Type Extractor Stands Out
HuaTai’s loop type extractor is engineered for high efficiency, durability, and cost-effectiveness in solvent extraction plants. Key benefits include:
- Low maintenance requirements due to robust chain-drive mechanics.
- Uniform meal discharge for stable downstream processing.
- Enhanced solvent recovery for economic and environmental benefits.
- Scalable designs to match production demands from small to ultra-large facilities.
For industries seeking high-capacity, reliable, and energy-efficient solvent extraction solutions, the loop type extractor remains a top choice in modern edible oil processing plants.