Batch Dryers

moz-screenshot-13High-efficiency dryers significantly reduce production and drying times, improve product quality, maximize product recovery and minimize environmental and worker exposure. DDPS dryers feature unique vessel and agitator designs that meet the most stringent pharmaceutical specifications. Our easy to clean dryers are available for both dedicated and multi-purpose applications. In order to ensure proper selection of drying equipment and fully operating systems, we have a state-of-the-art test facility in Europe, as well as a US rental fleet for on-site customer testing.

Spherical Dryers

Universal Dryers

Agitated Pan Dryers

Glass-Lined Conical Dryer-Blenders

Rotary Vacuum Paddle Dryers

Drying Systems

Spherical Dryers

Spherical Dryer Product Description

moz-screenshot-14The Spherical Dryer is a highly engineered and precision fabricated vacuum dryer designed to utilize heat input, effective mixing and vacuum for product drying. 

Spherical Dryer Applications

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.

Spherical Dryer Features

The Spherical Dryer can be provided in two unique configurations to meet your process needs.

Top Driven Features:

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

Bottom Driven Features:

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

Both configurations feature the following:

  • 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)

Spherical Dryer Advantages

  • Highly efficient (Short drying times)
  • Easy inspection
  • Fast and easy cleaning (CIP/WIP)
  • 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

Spherical Dryer Specifications

  • Volumes up to 6000 Liters
  • ASME code rated vessels
  • Pressures from full vacuum to 150 psig


  • Special alloy construction on request
  • Top or bottom entry drives
  • Dry or wet running seals
  • Full CIP/WIP options
  • Various mounting configurations
  • Contained charging, discharging, sampling and product transfer
  • Additional peripheral equipment

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Universal Vacuum Dryers

Universal Dryer Product Description

Universal DryerThe 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. 

Universal Dryer Applications

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. 

Universal Dryer Features

The Universal Dryer features a horizontal construction with an integrated agitator/chopper system and full-area heating. A hydraulic, encased drive for the agitator and chopper ensure a consistently high torque. The hinged front door, which can be quickly and easily opened for inspection, provides access to the entire diameter of the cylinder.

Universal Dryer Advantages

The dryer can even be filled between 20-90% of total capacity and still retain optimal agitation, mixing and drying performance.  Even with low rotational speeds allowing the dryer to be filled between 20-90% of total capacity and still retain optimal agitation, mixing and drying performance.

Universal Dryer Specifications

  • Volumes from 50 to 8,000 liters
  • Heating surface areas from 1.2 to 29.6 m²


  • Spray assembly on agitator for gas/liquid introduction
  • Addition of fixed stator to agitator systems for decreased particle size of product.

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Agitated Pan Dryers

Pan Dryer Product Description

moz-screenshot-16Based 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.

Pan Dryer Applications

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

Pan Dryer Features

Available with top or bottom entry-drive technology, the pan dryer comes equipped with a speed-controlled, heated agitator that facilitates short drying times.  The pan dryer also features a side discharge valve that enables simple emptying.  As with the spherical dryer, the mechanical seal of the pan dryer is also advantageously located outside of the product area.  The axial motion of the agitator is sealed by metal bellows, as with the Filter/Dryer.

Pan Dryer Advantages

  • 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. 

Pan Dryer Specifications

  • Volumes from 100 to 7500 liters

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SR Series Conical Dryer-Blender

SR Series Product Description

moz-screenshot-17The 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.

SR Series Applications

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

SR Series Features

The standard supply is as follows:
  • Carbon steel inner vessel lined with 3009 glass.
  • Charging and discharging nozzles.
  • EasyLift™ Manway Assist with GasketSav'r™ and PTFE-lined and bonded protection ring for the charging nozzle cover.
  • 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:
    • The drive side is fitted with a rotary union to feed the heating medium. It also houses the drive assembly consisting of a spur gear drive, motor break and inverter duty explosion proof motor.
    • The vacuum side support is fitted with a Hastelloy C vacuum tube. The vacuum tube is sealed by means of a mechanical seal with PTFE bellows and ceramic seat. The vacuum tube also houses a thermowell.

SR Series Advantages

The operation and maintenance costs are very low.  In many cases, it is possible to reduce batch time.

SR Series Specifications

  • 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


  • Stainless steel or glass-lined steel construction
  • Additional charging nozzles
  • Butterfly valves on charging and discharging nozzles
  • Various designs and material of construction for the vacuum tube
  • RTD temperature sensor cartridge
  • Nitrogen or gas inlet pipe
  • Special support systems
  • Adjustable lump breakers (choppers) for materials that tend to become lumpy
  • Insulation and special coating
  • Heated cover to prevent condensation
  • "Clean room" version with minimized dead zones and remote control for filling, emptying and cleaning functions.

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Rotary Vacuum Paddle Dryer

Product Description

RVPD-1250L-GMP-ModelThe 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.

Paddle Dryer Applications

In addition to standard batch drying applications, the paddle dryer can also be used for:

  • Low temperature drying
  • Reaction
  • Crystallization
  • Extraction of useful liquids
  • Recovery of solvents

Paddle Dryer Features

The RVPD is adequately designed to counter stresses developed by vacuum and temperature cycles in the various heated parts. The standard design of the paddle dryer system includes a dust filter, condenser, receiver and vacuum pump.  Other features include:

Hollow Shaft and PaddlesHollow shaft and paddles

The hollow rotating agitator shaft imparts heat to the product, scrapes the shell wall, tumbles the product for maximum heat transfer and discharges product when required.



Discharge Valve

User friendly design provides vacuum tight closing when the material is processed and quick opening facilitates filling of bags when material is discharged and packed.


1500Litres-RVPD-Pharma-ModelA pharmaceutical design is also available for GMP compliance with additional features, including:

  • Full door opening for ease of operation, cleaning, inspection, and validation.
  • Mechanical Seal to avoid product contamination.
  • Clean area installation with stainless steel partition wall between the process area and the drives.
  • Machined and mirror polished inside surfaces with PTFE Scrapers.
  • Sterile Operation

Paddle Dryer Advantages

  • 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.

Product Specifications

  • Stainless steel or Hastelloy construction
  • Designed as per ASME Pressure Vessel Code
  • 25 to 60,000 liters capacity
  • Up to 200 Hp designs
  • See Technical Table for additional information

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