Thin Film Evaporator - Design Principles

Rotor Orientation

• Vertical is used for most applications. The vertical configuration provides reliable, efficient processing of viscous and fouling fluids. Units are available with either an internal or external bottom bearing.

• Horizontal designs are ideal for applications where longer residence times are required for mass transfer and reactions, or where headroom is limited. The tapered configuration allows adjustment of the rotor clearance to control residence time, and assures heat transfer surface wetting at low throughput rates.

Vapor Flow

• Countercurrent is used for most vertical applications since it maximizes both heat and mass transfer efficiencies and accommodates internal vapor/liquid entrainment separation.

• Co-Current is the best choice for applications where there is heavy vapor loading, foaming, or flashing.