Evaporation applications that involve high boiling points, high viscosity, heat sensitivity or fouling products can be troublesome. Pfaudler’s extensive experience and expertise in this area and the Pfaudler Wiped Film Evaporators (WFE) are the solution.

The Wiped Film Evaporators (WFE) are designed to continuously separate volatile compounds by introducing a mechanically agitated thin film of feed material to a heated surface for efficient and reliable processing of a wide variety of products. WFE’s operate under high vacuum in order to reduce operating temperatures for high boiling and heat sensitive products. The short residence time minimizes the heat history to prevent thermal degradation. Special WFE designs provide for efficient processing of viscous materials like polymers and resins. The wipers continually clean the heat transfer surface making the WFE ideal for fouling applications.
WFE Construction & Operation Video
This video shows the construction of a WFE, with its major components, and also demonstrates the separation of components, by differences in volatility, using a WFE with a short-path evaporator design.

WFE Design Features
The operating features of Pfaudler’s WFEs, such as high vacuum (short path) distillation, short residence time and a highly agitated thin film of feed product on a heated surface, makes WFEs ideally suited to handle a wide range of heat sensitive, high boiling, fouling, and viscous materials.

With WFE sizes ranging from 1.2 sq. ft. (0.1sqm) to 500 sq. ft. (46.5sqm), no application is too small or too big for Pfaudler. Every Pfaudler Wiped Film Evaporator is thoroughly tested and inspected prior to shipment via Factory Acceptance Testing including a vacuum rise test, internal and jacket hydrostatic pressure test, and a operational test with water to ensure the WFE is operating precisely to our standards prior to shipment.

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