Spherical Dryers

Spherical Dryer image

The Spherical Dryer is a highly engineered and precision fabricated vacuum dryer designed to utilize heat input, effective mixing and vacuum for product drying. 

It can be used for dedicated or multi-purpose applications and it provides the best in product quality, total discharge, cGMP production, cleanability and limited operator exposure.

The Spherical Dryer can be provided in two unique configurations - top driven or bottom driven - to meet your process needs.


Top Driven Features:

  • Volumes up to 2000 Liters
  • Multi-purpose processes
  • Dry or wet running seals
  • Automated bayonet flange
  • Automated vessel hinge

Bottom Driven Features:

  • Volumes up to 6000 Liters
  • Dedicated processes
  • Wet running seals only
  • Higher torque capabilities

Both configurations feature the following:

    • ASME code rated
    • Pressures from full vacuum to 150 psig
    • Fabricated in 316L and C-22
    • Metal-to-metal sealing discharge valve
    • Dust filter
    • Fully jacketed vessel
    • Heated agitator
    • Machined vessel internals (close agitator-to–side wall tolerance)


  • Highly efficient (Short drying times)
  • Easy inspection
  • Fast and easy cleaning (full CIP/WIP options)
  • Can perform drying, mixing and granulating
  • Minimal fill volume (15%)
  • Vessel design maximizes product yield through total product discharge
  • Minimize dust explosion hazard
  • Vertical chopper (Lump breaker)
  • Reproducible drying results
  • Contained charging, discharging, sampling and product transfer options

Universal Vacuum Dryers


The universal dryer features a high-speed, removable chopper that breaks up lumps of wet or dry agglomerates while providing additional mixing capability, shorter drying times with the highest possible fill volume. 

The Universal Dryer is ideal for difficult drying processes that involve drying, mixing, milling, granulation, evaporation and/or crystallization.  Since the product area is completely contained, this product is appropriate for pharmaceutical intermediates and fine chemical applications.  


  • Horizontal construction with an integrated agitator/chopper system
  • Volumes from 50 to 8,000 liters
  • Heating surface areas from 1.2 to 29.6 m²
  • Hydraulic, encased drive for agitator and chopper ensures a consistently high torque
  • Hinged front door for quick and easy inspection



  • Can be filled between 20-90% of total capacity and still retain optimal agitation, mixing and drying performance
  • Full area heating 
  • Complete containment of product
  • Spray assembly on agitator enables gas/liquid introduction
  • Addition of fixed stator to agitator systems decreases particle size of product

Agitated Pan Dryers

Rosenmund Pan Dryer

Based on the well established and proven Filter/Dryer technology, agitated pan dryers are differentiated by their heated flat bottom plate that effectively enlarges the heating area of the vessel.

It is specifically designed for the batch drying of solids and uses a unique "vortex" mixing action for improved drying performance.


  • Top or bottom entry-drive technology
  • Speed-controlled, heated agitator
  • Side discharge valve that enables simple emptying
  • Mechanical seal located outside of the product area
  • The axial motion of the agitator is sealed by metal bellows



  • The minimal agitator to wall clearance keeps the wall free from product crust 
  • The pan bottom can be easily lowered for fast cleaning (CIP/WIP and SIP) and inspection
  • Heated agitator design facilitates short drying times
  • Can handle a wide range of capacity with volumes from 100 to 7500 liters

Glass-Lined Dryers


The SR Series glass-lined steel rotary dryer/blender combines the drying and mixing function in one simple and stable device. The rotation of the double cone allows the product to be mixed and dried without an internal agitator.

The design is suited for processing easily flowing, corrosive products for drying, mixing or concentrating pharmaceuticals, dyes, pigments, synthetic resins, etc.


  • Volumes from 100 to 7,220 liters (30 to 1,900 gallons) or 12.5 to 203 ft² of heating area
  • Pressures from full vacuum to 90 psig
  • Carbon steel inner vessel lined with 3009 glass
  • Charging and discharging nozzles
  • Steel conventional jacket welded to the inner vessel, including all nozzles necessary for heating
  • Two support structures forming a mono-block assembly, each equipped with double-row self-aligning roller bearings


  • Low operation and maintenance costs
  • Insulation and special coating helps to improve batch time
  • Adjustable lump breakers (choppers) for materials that tend to become lumpy
  • Heated cover to prevent condensation
  • "Clean room" version with minimized dead zones and remote control for filling, emptying and cleaning functions

Rotary Vacuum Paddle Dryers


The rotary vacuum paddle dryer (RVPD) is a complete drying system used to obtain dry powder from wet cake or solutions. The drying operation is generally a batch process and is often carried out under vacuum. The product is heated through direct contact with the heated vessel and agitator surfaces.  The heating of the dryer can be accomplished by use of steam or adequate heat transfer fluid.

In addition to standard batch drying applications, the paddle dryer can also be used for low temperature drying, reaction, crystallization, extraction of useful liquids and recovery of solvents.


  • Stainless steel or Hastelloy construction
  • Designed as per ASME Pressure Vessel Code
  • 25 to 60,000 liters capacity
  • Up to 200 Hp designs
  • The standard design of the paddle dryer system includes a dust filter, condenser, receiver and vacuum pump.  Other features include:

    • Hollow shaft and paddles

    • Discharge Valve


    • Versatile in process applications
    • High energy efficiency
    • Low operating costs compared to other types of dryers
    • Large heat transfer area available on paddles and shaft give maximum heat transfer rates
    • The scrapers have minimum calculated clearance from the shell to keep the shell clean and increase the heat transfer co-efficient
    • Optional pharmaceutical design provides GMP compliance and sterile operation

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