Conical vacuum dryers can adapt to almost all process requirements in chemical, fine chemical, pharmaceutical and food industries

2023/04/14

Vertical Cone Vacuum Dryers are used as vacuum contact dryers and evaporators, as well as sterilizers or alkalizers, providing high quality with short drying times. Processed products range from slurries and pastes to filter cakes, granules and powders.

Continuously increasing demands on quality and economic efficiency require innovative solutions for the production of intermediate products in the chemical, fine chemical, pharmaceutical and food industries.

Especially for construction materials such as adhesives and sealants that require functional additives such as chalk, carbon black or calcium carbonate, which is essential to produce the best quality end product. During such processes, the moisture content should be as close to zero as possible to prevent unintended reactions with other product ingredients from affecting quality.


The gentle yet intense mixing of the SR Vertical Cone Vacuum Dryer ensures short drying times without high product debris.

Drying takes place at a pressure of less than 30 mbar absolute, with a final moisture content of no more than a few ppm, depending on the application.

Highly efficient conical vacuum dryers are typically used after mechanical solid-liquid separation, but can also be operated without a mechanical separation step. Due to different agitator designs including helix, double helix, paddle or segmented helix, it can meet various process requirements.

From stainless steel to (super) duplex steel, Hastelloy or titanium, different application-specific materials are available for parts in contact with the product. With its flexibility, the dryer can be used for vacuum contact drying as well as evaporation, sterilization and alkalization, and also as a reactor for slurries, pastes and filter cakes, as well as granules and powders.


The central mixing screw is the core technology of the SR conical vacuum dryer and its central shaft agitator.

The helix is ​​precisely adapted to the container's design and runs against the wall, ensuring optimum mixing of the product. The mixing auger feeds the product upwards along the heated vessel walls, while gravity ensures vertical mixing in the center of the vessel. Rotation results in a horizontal flow component.

The three-dimensional mixing principle means that fresh material is continuously fed into the heated vessel wall, which results in an even temperature in the dryer. Combined with a heated mixing screw, the optimized agitator achieves perfect mixing results and reduces drying times.

Vessels including dished lids are heated to temperatures up to 400°C using heat carriers such as water, (saturated) steam or thermal oil through jackets, half-pipe coils or pillow plates.

By heating the entire dryer, cold spots are prevented from forming. Plus, the insulated jacket keeps heat inside the dryer while providing operator protection from injury.



Ball valves with inflatable, hygienic lip seals are often used as product discharge emptying valves at the central outlet of the container cone to ensure maximum tightness in vacuum or pressure operation.

It keeps the helical section vanes as close as possible to the geometry of the outlet ball section, minimizing unmixed areas and product carryover.

Self-centering helical design with bearing on one side

Double-action mixing screw, especially gentle, fast homogenization

Drives and bearings outside the mixing chamber prevent risk of product contamination from lubricants etc.

Sealing on the outside of the mix/dry product greatly reduces maintenance costs

Drying temperature from –20°C to 800°C

Temperature transfer via double jacket, half pipe, shaft and helix

Larger heated surface design reduces drying time

Above-average heat transfer through continuous mixing and intense product contact with the heated side walls

Heating medium: steam, thermal oil, water or electric heating for high temperature applications, coolant: brine solution or water

Pressure in product and heating chamber: -1 bar to +40 bar



Materials: Carbon steel to high quality stainless steel such as Hastelloy

RPM is lower than other systems

Larger workload range and optimum residual discharge

Very high evaporation capacity – the evaporation process can be controlled almost continuously

High resistance to failure and low operating costs

ZhangHua Machinery carefully studies all the details and listens to your opinions. For many situations, we've come up with the best solutions.

Whenever a new challenge arises, we work with you to develop the right product.



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