The solvent is somehow expensive than water. So, it should be recoverable easily. Therefore, it
should be stable to several distillations. There are 3 main methods of solvent recovery namely-
1)Air drying
2) Heated cylinder drying and
3) Steaming.
1) Air drying: Hot air is circulated in closed chambers in where the temperature of air exceeds the
evaporating temperature of solvents. Vaporized solvent is condensed and hence recovered.
2) Heated cylinder drying: A number of heated cylinders are used through which the materials are
passed. The temperature of cylinders exceeds the evaporating temperature of solvents.
3) Steaming: As steam and solvent do not mix with each other steam can be used to evaporate and
carry the solvent out.
In an efficient solvent recovery system up to 95% solvent can be recycled.
Friday, 29 December 2023
Solvent recovery
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