Horizontal Decanter Centrifuge for Solid-Liquid Separation and Clarification of Plant Extracts

In the industrial extraction of natural plant active ingredients, raw materials such as herbs, leaves, roots and fruits are crushed and leached to obtain crude extract liquid. The leaching solution contains not only target active substances such as flavonoids, polyphenols and glycosides, but also a large number of solid impurities including fine plant fiber, broken cell debris, insoluble starch and suspended colloids. These tiny residues cannot be completely removed by conventional filtration equipment. If retained in the feed liquid, they will cause turbidity and precipitation of finished extracts, block subsequent precision filters and membrane systems, increase cleaning frequency and reduce the service life of downstream processing equipment.

Traditional plant extract clarification processes have obvious technical limitations. Static settling requires long standing time and occupies a large number of storage tanks, which slows down production efficiency and easily causes oxidation and mildew of active ingredients. Plate-frame filter presses and bag filters are prone to fiber blockage, require frequent replacement of filter cloths, and generate large amounts of waste consumables. In addition, traditional filtration cannot remove micro-fine colloidal impurities, resulting in high turbidity of the filtrate, which seriously affects the refining quality of high-end plant extracts.

The horizontal decanter centrifuge completely solves the bottlenecks of traditional extract pretreatment. Relying on high-speed rotary centrifugal force field, the equipment realizes rapid layered separation according to density difference. High-density solid residues such as plant fibers and cell debris settle on the inner wall of the drum and are continuously pushed out by the differential screw, while low-density clear extract liquid flows out stably. The whole process realizes 24-hour uninterrupted feeding, separation and slag discharge, achieving fully automated continuous production.

Different from intermittent filtration equipment, the decanter centrifuge adopts low-shear and fully enclosed separation structure. It avoids material splashing, active ingredient oxidation and external pollution during the clarification process, effectively protecting the natural activity of heat-sensitive plant ingredients. The adjustable rotating speed and differential speed can flexibly adapt to different plant materials, liquid viscosity and residue content, ensuring stable separation effect for various botanical extracts.

In standardized plant deep-processing lines, the decanter centrifuge is used as the core pretreatment equipment after leaching and before membrane refining. It removes more than 98% of solid suspended residues in the crude extract, greatly reducing particle load for subsequent ultrafiltration and nanofiltration systems. Effective removal of fiber and colloidal dirt significantly slows down membrane fouling, extends membrane service life, and reduces the operating cost of downstream refining processes. At the same time, the clarified clear liquid improves the concentration efficiency of evaporators and enhances the transparency and appearance quality of finished extract products.

The equipment features large single-machine processing capacity, small floor space and low maintenance cost, which is very suitable for large-scale and high-volume botanical extraction projects. Fully automatic operation reduces manual intervention and labor costs, and ensures stable batch consistency of extract pretreatment quality. The closed operating environment effectively avoids odor diffusion and dust pollution, meeting the clean production and environmental protection requirements of modern food, pharmaceutical and cosmetic raw material processing enterprises.

With the rapid development of the natural plant extract industry, continuous, efficient and low-loss pretreatment technology has become an important standard for factory upgrading. The horizontal decanter centrifuge provides a mature and reliable solid-liquid separation solution for botanical extract clarification. It effectively improves material utilization rate, optimizes production efficiency, and creates higher economic benefits for modern plant deep-processing enterprises.