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Rototherm® D Continuous Vacuum Dryer improves product quality

Artisan’s Rototherm D is a specialized slow-speed dryer designed for continuous vacuum drying or post-drying of free-flowing solid materials.

Rototherm® D

It offers the following benefits over batch dryers:

Rototherm D is a jacketed, mechanically-agitated dryer that continuously removes moisture or solvents from powders and bulk solids under vacuum. It is especially useful for diffusion-limited drying applications where long residence times are required.

Rototherm D operating principle

Dryer Illustration

Moist powder or bulk solids are fed into Rototherm D at one end. The horizontal shell and the specially designed rotor are heated by water, steam, or hot oil. The product is agitated at low speed by the helical mixing bars, gently churning and continuously conveying it to the discharge end of the dryer in a plug flow manner.

Vacuum minimizes drying temperature and avoids thermal degradation of heat sensitive materials. An adjustable weir at the discharge end keeps the product level in the dryer between 25% and 75% full. The residence time is controlled by adjusting the height of the weir or changing the feed rate.

The dry product discharge is collected either by batch in a sealed vessel or continuously after passing through a vacuum lock vessel.

Applications

Rototherm D is a product in development by Artisan. If you have an application that you believe would benefit from Rototherm D’s operating principles, then our product development team would be happy to work with you to incorporate this technology into your R&D projects.

  • Drying heat sensitive powders and bulk solids
  • Drying shear sensitive powders and bulk solids
  • Diffusion controlled drying applications
  • Further dewatering readily dried sludges and presscakes
  • Sublimation of powders
  • Solid state polymerization/polycondensation