Short path evaporator

process

In a short path evaporator, the rotor cage assembly surrounds an internal condenser and revolves at moderate speeds. Feed enters through a nozzle at the top of the unit and is spread into a thin film on the inside surface of the shell via the rotor blades. The rotor blades gently agitate the process liquid as it travels down the heated surface in a very short time while vapors are generated on the heating surface. These vapors flow through the rotor cage before condensing on the internally-located condenser. The cage-type construction and location of the internal condenser create a short vapor flow path or “short path”, extending the operating pressure capability from 1 mbar to 0.001 mbar compared to a standard thin-film evaporator. Capacity can be varied by adjusting the feed rate, heating temperature, rotor speed, and/or vacuum to achieve the desired composition result.