Principle of operation
Evaporation for the purpose of concentrating a solution composed of a volatile solvent is of a less volatile solute.
Ascending film evaporation is a continuous process where the solution is heated in a monotubular vertical evaporator to vaporize the solvent. (First effect).
In the head cyclone, the mists, formed by the vaporization of the solution which are composed of solvent vapor and concentrated solution, are separated into two phases: the concentrated liquid phase is discharged by gravity and then sent via a metering pump into the second evaporator while the vapor phase is used as heating of the second evaporator.
In the second rising film evaporator, the already concentrated solution is heated, under reduced pressure, to vaporize the solvent (second effect).
In the secondary cyclone, the mists formed by the vaporization of the solution which are composed of solvent vapor and concentrated solution are separated into two phases: the concentrated liquid phase is removed by gravity and then stored and the vapor is condensed before to be collected in a recipe.