Use

Wiped film evaporator (WFE) is a type of distillation or evaporation equipment used to separate substances based on their volatility—particularly when dealing with heat-sensitive or high-viscosity materials.

Pharmaceuticals – for purification of active ingredients

Essential oils – concentration and purification

Fine chemicals – removal of solvents or high-boiling impurities

Food industry – refining oils and flavor concentrates

Working Principle

The material enters the evaporator radially from the top of the heating zone; It is distributed to the heating wall of the evaporator through the distributor, and then the rotating film scraper scrapes the material continuously and evenly on the heating surface into a liquid film of uniform thickness and pushes it downward in a spiral shape.
In this process, the rotating film scraper ensures a continuous and uniform liquid film with high-speed turbulence and prevents the liquid film from coking and scaling on the heating surface, thereby increasing the total transfer coefficient. The light components are evaporated to form a steam flow that rises, and reaches the external condenser directly connected to the evaporator through the vapor-liquid separator. The reconstituted part is discharged from the cone at the bottom of the evaporator.

Features

✓ Short residence time – ideal for heat-sensitive compounds

✓ High evaporation rates due to thin film

✓ Vacuum operation – allows for low-temperature distillation

✓ Continuous operation