1. The boiling point of the solution increases

Because the solution contains non-volatile solutes, at the same temperature, the vapor pressure of the solution is lower than that of pure solvents. Under the same pressure, the higher the boiling point of the solution, the higher the proportion of high concentration pure solvents, which makes its impact greater

2. Material and process characteristics

Substances are often heated and deposited on the surface due to concentration, solutes, or impurities, forming a scale layer of deposited crystals that affect heat transfer. Some solutes are thermally sensitive and prone to corrosion when stored at high temperatures for a long time. Some materials have greater corrosion or higher viscosity.

3. Energy recovery

The process of solvent evaporation is a large-scale energy consuming unit operation due to the high latent heat of solvent evaporation. So, energy conservation should be considered an important issue in evaporator operation.