Rotary Double Cone Vocuum Dryer


5 Litres to 5000 Litres


Rotary double cone vacuum dryers are suitable for drying & mixing powder (raw materials), pharmaceutical materials, crystalline products, insecticides, pesticides, food products & also for heat sensitive products. The equipment can also be used as rotary evaporator. Promas Engineers is a certified company for manufacturer, supplier and exporter of rotary double cone vacuum dryers according to ISI guidelines and user’s requirements since 1990 from Mumbai to India and all over the world.

Working Principle Rotary Double Cone Vacuum Dryers

Raw material is charged in batches & is subjected to indirect heating while at the same time undergoing rotary motion of the cone assembly. The conical shape of the dryer ensures efficient circulation of hot liquid heating media. Drying takes place when heat flows from outer cone through a jacket, and vacuum is applied in the inner cone. The drying operation is based on the principle that water or other volatile product moves from a zone of low pressure. This is accomplished by warming the product to be dried to raise the vapour pressure of the absorbed or free liquid by vacuum or by sweeping it with Air or Nitrogen current. Thus the essential conditions for effective drying are achieved by uniform heat transfer throughout the batch and rapid removal of the vapour. The vacuum is applied gradually with PLC control by throttling.

Our Specialities

  • Creating innovative and cost effective designs as per your requirement to give you maximum and best output from our equipment
  • Providing Lab Models in exactly the same material to give the accurate results Design and supply of entire turnkey projects at any scale, from 500 kgs to 20,000 kgs capacities.

Promas Engineers Rotary Double Cone Vacuum Dryer is unique in removing complete water, or other solvent from wet powders coming from a filtration unit or a centrifuge. It can be used as an effective dryer, fast mixer & blender or homogenizer. It can also be used as a granulator.

The drying time is substantially reduced because of high-speed choppers, which help the evaporation of the solvent or moistures. Chopper speed can be controlled by a frequency drive. Dryer are manufactured as per “US-FDA” Standards & Regulations.

Salient Features Rotary Double Cone Vacuum Dryers

  • Low temperature drying under vacuum
  • Higher Thermal Efficiency
  • Specially designed micro air-filter can be provided on receiver while breaking vacuum for safety operation
  • Nitrogen purging system is available optionally for mechanical seal as well as for cleaning filter
  • Specially designed S.S. Rotary union is provided for hot water or steam at inlet & outlet
  • Direct drive with hollow shaft gear to suit cGMP operation & to avoid greasing of the gear.
  • The gear box with only one time of oil fill for lifetime
  • Lowest energy consumption compared to any other batch type dryer due to higher differential temperatures
  • Available in STD/GMP/cGMP/ Lab Models and kilo lab models


  • Suitable for drying of materials which cannot resist high temperature.
  • Material which are easily oxidized
  • Specialty chemicals
  • Volatile Materials which should be retrieved
  • Materials which are strong irritants and poisonous in nature
  • Solvents which need to be recoverer


  • Reduces drying time.
  • Total contained process, dust control.
  • Efficient Charging and Discharge.
  • Choppers (Lump Breaker) give lump free product.
  • Easy Open-able charging port.
  • Eliminates need for re-drying of lumps.
  • Handling and exposure of final product is avoided.
  • Gives uniformity size dry product.
  • System can process crystalline or amorphous powders which are prone for lumps.
  • Easy to clean internal surface, thus ensuring purity of product.
  • Optimum and Continuous vacuum maintenance during process.
  • Uniform material shuffling over the heated contact surface of the cone.

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