|Calandria Evaporator :
Evaporation deals with
the concentration of a non-volatile solute from a solution by the
removal of required amount of volatile solvent. Usually the solvent is
water. By vaporizing a part of the solvent, useful product i.e. the
concentrated solution or thick liquor is produced and the vapour is
discarded. Long tube evaporators are usually used for the concentration
of foamy liquids. It is a short tube vertical evaporator; the tubes are
surrounded by a Stainless Steel jacket and fitted with accumulator.
Dilute solution is feed to evaporator and heated by Steam from a steam
generator to concentrate the dilute feed solution to a desired level.
The jacket is fitted with a steam trap and the condensate is collected
at the end of trap. The vapours of volatile solvent are condensed in a
shell & tube type condenser and the balance non-volatile solute
collected in the accuI1mlator is recycled through the evaporator