A simplified flowsheet for the manufacture of sugar is shown in figure 1 below. Sugarcane is
fed to the mill where syrup is squeezed out, and the resulting 'baggasse' containing 30 pulp.
The syrup (E) containing finely divided pieces of pulp is fed to a screen which removes all the
pulp and produces a clear syrup (H) containing 15% sugar and 85% water. The evaporate
makes a "heavy" syrup and the crystallizer produce 1000kg/hr of sugar crystals.
a. Find the water removed in the evaporator, kg/hr.
b. Find the mass fraction of the components in the waste stream G.
c. Find the rate of feed of cane to the unit, kg/hr.
d. Of the fed in the cane, what is percentage is lost with the bagasse?
e. Is this an efficient operation? Explain why or why not.
M Sugar,
1000 lb/hr
Mill
F Cane
16% Sugar
25% Water
59% Pulp
D Bogosse
80% Pulp
E
13% Sugar
14% Pulp
Crystallizer
L
Water
K 40% Sugar
H
Screen
Evaporator
J
Woler
15% Sugar
Solids G Contain
95% Pulp
Figure 1