Double-cone rotary vacuum dryer: Both ends are covered, and the double-cone rotary vacuum dryer is slightly olive-like. Two axes are set in the middle to support the body. The body has a jacket for heating, the body can be rotated when dry, so that the material and the wall are often replaced contact, overcome the shortcomings of the vacuum oven material mainly rely on the heating tube conduction and low thermal efficiency. Rotary vacuum dryers have been widely used in fine chemicals, medicines, etc., and are not suitable for materials with high viscosity or strong adhesion during rotation. The equipment is mainly used in medicine, chemical industry, food and other industries. The concentration, mixing and drying of powdery, granular and fibrous materials, and materials that require low-temperature drying (such as biochemical products, etc.) are more suitable for easy oxidation, volatile, and heat-sensitive stimulation. Drying of toxic materials and materials that are not allowed to damage the crystals.
Freeze dryer: The ice was then sublimated under reduced pressure to obtain dry material. Since the whole process takes place below the freezing point, the freeze-dryer freezes the liquid first. Commonly used for the drying of heat-sensitive items. Due to the difficulty of heating the frozen material under vacuum, and the need to condense and sublimate the water vapor under reduced pressure, a relatively large refrigeration system is required, and thus the drying cost is large. The moisture in the highly heat-sensitive material is frozen and will be maintained under a high vacuum to a temperature below the freezing point. Sublimates moisture and separates it from the material. There is little loss of active ingredients in the material, but the drying rate is low.

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