An improved evaporation process for accomplishing the separation of a solution into its volatile and non-volatile components. The improvement over conventional evaporation, according to which the solution is fed to a calandria where it is heated and partially vaporized and the resulting calandria vapor stream is subjected to vapor-liquid separation for the removal of entrainment, relates to the practice of an additional and intermediate step in which the calandria vapor is contacted with the feed solution.