SAMINAR TOPIC:- MULTI EFFECT EVAPORATER

SEMINAR Mrs. Smita gupta COORDINATER:- Mr. S.K. Srivastava

PRESENTED BY:- C.Shekhar

MORADABAD INSTITUTE OF TECHNOLOGY (MORADABAD)

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.

http://www.sciencedirect.com/science/article0877404001232/pii/S026

Calendria Type Evaporator

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.

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-Backword Feed multi effect evaporator,3- Mixed feed multi effect evaporator.

1- Forward Feed Multi Effect Evaporator:-

vapour vapour vapour to condenser

Feed steam I Effect II Effect III Effect

Liq. Liq.

Condensate Condensate Condensate Thick Liquor

2-Backward Feed Multi Effect Evaporator:-

vapour vapour vapour to condenser

steam

Feed

I Effect II Effect III Effect

Liq. Liq. Condensate Condensate

Condensate Thick Liquor

3- Mixed Feed Multi Effect Evaporator:- vapour vapour

vapour to condenser

Steam feed

I Effect II Effect III Effect

Condensate

Liq. Liq.

Condensate

Thick Liquor

Condensate

Application:-

Product concentration,  Solvent Volume reduction in a solution,Water / solvent recovery,Crystallization.

Advantage:-

Advanced System,Easy Operation And Maintenance,Own Manufacturing And Quality Checked,Cost Effective Operations.

Reference:-

http://www.sciencedirect.com/science/article/pii/S0260877404001232

http://www.lenntech.com/evaporation.htm#ixzz2cxf14cVw

http://www.wikipedia.com/eveporation“Unit Operation in Chemical Engineering”

Mc,Cabe,Smith,Harriot(7th Edition),