Basic concept of phase equilibria, factors affecting evaporation, evaporators, film evaporator, single effect and multiple effect evaporator. Theoretically, evaporation means simply vaporization from the surface of the liquid. Evaporation is an unit operation by which a solvent is evaporated from a solution by boiling the liquor in a suitable vessel and withdrawing the vapor, leaving a concentrated liquid residue. To make a solution more concentrated. Generally extracts are concentrated in this way.

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