The complete system comprises an extractor, first- and second-effect rising-film evaporators, a stripping tower, a condenser, a vacuum unit, a solvent recovery system, and a PLC automatic control unit. It operates entirely under a sealed, slight-negative-pressure environment, balancing extraction yield, product quality, energy consumption, and production safety.

Working Principle

A vacuum unit creates a slight-negative-pressure environment within the system, lowering the solvent's boiling point to enable low-temperature extraction. The oil-solvent mixture undergoes low-temperature solvent separation via multi-effect negative-pressure evaporators and a stripping tower; the resulting solvent vapor is condensed and recycled. The entire process operates in a sealed loop, utilizing waste heat from secondary steam, which effectively prevents thermal degradation of the materials while reducing energy consumption and solvent loss.

Advantages

- Low-Temperature Quality Preservation: Processing occurs at low temperatures under negative pressure, preventing scorching or oxidation of materials. This results in crude oil with excellent color and low residual solvent content, significantly enhancing the quality of both primary products and by-products.

- High Efficiency and Energy Savings: Waste heat from secondary steam is recovered, drastically reducing the consumption of steam, cooling water, and solvent, thereby lowering operational costs.

- Safety and Environmental Protection: The entire system operates under a sealed, slight-negative-pressure environment, eliminating solvent leaks and safety hazards while improving the workshop's working environment.

- Stability and Intelligence: Supports continuous mass production and features a fully automatic PLC control system, ensuring stable operation, easy maintenance, and high equipment durability.

- Versatility: Compatible with a wide range of raw materials—including oilseeds, traditional Chinese medicinal herbs, plant pigments, and essential oils—and customizable to various production capacities.