Thin-film and
Short-path Evaporation

The thin-film evaporator consists of an internal rotor and a cylindrical heating surface that is heated from the outside with steam or thermal oil. The medium is distributed around the circumference of the head with a distribution ring and flows down the heated evaporator wall.

Special wiper elements ensure an even distribution of the medium and create a liquid film. Turbulence forms on the wiper blades, ensuring both efficient heat transfer and continuous renewal of the liquid film. This means that the medium only comes into contact with the heating surface for a short time and is exposed to a minimal temperature load.

This gentle evaporation process achieves the highest product quality.

• Concentration of structurally viscous and highly viscous substances as well as temperature-sensitive substances
• Distillation of low-boiling media
• Special applications such as reboilers for rectification systems
• Purification by distilling valuable products from high boilers

• Improved heat transfer thanks to optimized wiper design
• Short downtimes for assembly, maintenance, and inspections
• Constantly renewed liquid film
• Optimized retention time of the product
• Rapid spare parts service
• Lower risk of corrosion
• For selected rotor types, no lubrication of the lower rotor bearings is necessary
• Custom design – optimum heating surface and rotor type according to requirements

The medium to be dried is distributed continuously around the entire circumference of the heating wall. Special wiper elements continuously renew the contact between the substance and the heating wall and ensure that the product flow continues.

As the solid rotor blades do not touch the heating jacket (defined gap), incrustation or blockage of the heating surface is avoided and liquid substances can be dried to powder form despite the gentle process.

• Slurry: Sewage sludges, process- and industrial sludge, municipal sludge
• Chemical products (precursors or intermediates)
• Saline solutions
• Moist solids
• Suspensions
• Pastes

• High product purity
• Minimal product loss
• Highest dry matter content
• Gentle drying thanks to short dwell time and permanent product circulationHardly any deposits on the heating surfaces due to mechanical cleaningReduced maintenance work thanks to clever design of the bearing and shaft seals
• Closed design for a controlled, virtually emission-free process operation

The basic functionality of our thin-film evaporators can also be found in our short-path evaporators.

The difference is a condenser integrated into the device. This principle keeps the vapor path to the condenser particularly short, minimizes pressure losses, and enables operation in fine and high vacuums.

• Distillation of viscous media at low process pressure (0.001 to 1 mbara)
• Production of fatty acids, derivatives and semi-volatile flavorings
• Separation of extracts
• Distillation of vitamins, oils and biodiesel

• Particularly gentle evaporation due to fine vacuum
• High boilers do not reach the condenser thanks to efficient droplet separators
• For the distillative purification of many challenging substances that cannot be separated using conventional thermal processes

The feed material is continuously fed into the POWERMOL 25, distributed along the heated evaporator wall, and guided downward.

Low-boiling components evaporate, condense internally, and are discharged as distillate, while higher-boiling substances are removed as concentrate.

Gear pumps transport the distillate and concentrate into collection vessels. Non-condensed vapors and inert gases are directed into the vacuum system, with a droplet separator preventing the entrainment of high-boiling components.

• Thermally sensitive substances: The system is optimized for thermally sensitive products. Thanks to short residence times in the evaporator, thermal stress remains minimal. A fine vacuum ranging from 0.01 to 1,000 mbar enables distillation under extremely low pressure conditions.
• Explosion-hazardous media: The system is ATEX-certified (2014/34/EU) and designed for handling explosion-hazardous media. Both the process area and the environment comply with ATEX II 3/3 G Ex T3 Gc X, ensuring maximum safety.
• Highly viscous substances with viscosities of up to 2,000 mPas.

• Meaningful trials at a location of your choice
• Cost-effective and rapid production of small quantities/sample products
• Gentle evaporation of temperature-sensitive, high-viscosity, and explosion-hazardous media
• High performance and reliable operation
• Optimizable for specific conditions
• Continuous data analysis
• Plug-and-play principle