(e) Rotary filter

• • The underflow mud from the bottom of thickener is passed to a continuous rotary filter press to recover sugar solution.

• This sugar solution if it is clear, is passed to multieffect evaporator or otherwise recycled back to clarifier.

• The filter cake produced is used for fertilizer.

(f) Multieffect evaporator

• • The clarified liquor overflows to the 3-4 forward feed multieffect evaporator.

• Here juice is concentrated from 80-85% H₂O to 40% H₂O to make juice ready for crystallization.

• A vacuum of 63cm is maintained in the last effect.

(g) Crystallizer

• • The clarified concentrated sugar solution comes to crystallizer.

• The sugar solution is further boiled in vacuum pans at vapor temperature of 57˚C until fine cloud of crystals is seen.

• Crystallization is completed in vacuum pan unit.

(h) Centrifuge

• • The mixture of crystals and syrup is called masscuite.

• The masscuite from crystallizer is centrifuged in basket type centrifuged to basket type to centrifuge remove mother liquor (molasses) which is a byproduct.

• The high grade sugar crystals are obtained here.

• The centrifuge speed is maintained at 800 to 1000 rpm.