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In the past, optimization had been studied only for typical flowpatterns like forward and backward feed. To make the choice between them, simple rules were applied based on the viscosity and the temperature of the initial dilute solution (TF). Thus, forward feed was usually favored for the evaporation of low-viscous hot solutions featuring a temperature TF>Tp, where TP is the desired temperature of the final product. By doing so, the liquid heating load is largely cut down. In turn, backward feed was recommended for heavyviscous cold liquors.

Optimal Synthesis of Multi-Effect Evaporation Systems of Solutions with a High Boiling Point Rise