Innovative Multiple Effect Evaporator Product Description An evaporator with three effects (3-stages) is a tube-type forced circulation evaporator in which strong steam is used for the first effect to evaporate the solvent from the feed. In the second effect, the vaporized solvent is used to evaporate the feed at atmospheric pressure. In the third effect, the evaporation of the concentrating feed from the second stage is used to evaporate solvent from the second stage. The evaporated solvent from the third effect is finally condensed with cooling water on the other side of the steam condenser. In all three processes, condensate is collected in condensate receiving tanks. The pure solvent in this condensate can be reused in the subsequent process.