The document discusses multiple effect evaporators, which are used to efficiently concentrate solutions by removing solvent, mainly water, through evaporation. It explains that multiple effect evaporators use heat from steam to evaporate water in multiple stages, making the process more economical than single effect evaporators. Multiple effect evaporators are divided into three categories based on feed direction: forward feed, backward feed, and mixed feed. They have various applications like product concentration, solvent recovery, and crystallization. Key advantages include being an advanced system that is easy to operate and maintain cost effectively.

1. Multiple effect evaporator

2. Contents
 Evaporation
 Multi effect evaporation
 Multi effect evaporator
 Forward Feed Multi Effect Evaporator
 Backward Feed Multi Effect Evaporator
 Mixed Feed Multi Effect Evaporator
 Application
 Advantage
 Conclusion
 Reference

3. Evaporation:-Evaporation is the process used to
concentrate a solution by removing the solvent
(mainly water) in a purified form by the application of
heat.

4. Multi Effect Evaporation:-
 Multiple Effect Evaporation remains one of the popular methods used
for the concentration of aqueous solutions. Water is removed from a
solution by boiling the liquor in an evaporator and withdrawing the
vapour. Evaporation occur in three steps:-
1. Pre-heating of a solution prior to evaporation.
2. Removal of water (solvent) as vapour by steam heating.
3. Condensing the vapour removed.

5. Multi Effect Evaporator:-
 A multiple-effect evaporator, as defined in chemical engineering, is an
apparatus for efficiently using the heat from steam to evaporate water.
 It’s divided in to three category on the basis of feed direction:-
1. Forward feed multi effect evaporator,
2. Backward Feed multi effect evaporator.
3. Mixed feed multi effect evaporator.

6. 1- Forward Feed Multi Effect Evaporator:-

7. 2-Backward Feed Multi Effect Evaporator:-

8. 3- Mixed Feed Multi Effect Evaporator:-

9. Application
 Product concentration
 Solvent Volume reduction in a solution
 Water / solvent recovery
 Crystallization.

10. Advantage
 Advanced System
 Easy Operation And Maintenance
 Own Manufacturing And Quality Checked
 Cost Effective Operations.

11. Conclusion
 using multiple effect evaporator we can make the evaporation process
more economical
 the steam requirement for multi effect evaporator is relatively less than
a single effect.

12. Reference
 “Unit Operation in Chemical Engineering” Mc,Cabe,Smith,Harriot(7th
Edition)
 http://www.sciencedirect.com/science/article/pii/S 0260877404001232