The first stage is heated by steam, whereas the second stage is heated by the solvent vaporized in the first stage. This unit consists of two falling-film shell-and-tube evaporators and of a shell-and-tube condenser. The automated version mod. Equipped with 2 PID controllers that enable to control the flow rate of steam reaching the evaporator, the vacuum degree in the system and the level of the first stage, automatically. The concentrated product and the vaporized solvent are collected into two glass tanks. The evaporator is fed by a metering pump and it works under vacuum thanks to a liquid-ring vacuum pump.

TRAINING PROGRAM

Automatic flow, level and vacuum control by PID controller

Determination of overall heat transfer coefficient

Energy balances

Optimization of the evaporation process

Mass balances.