Question

A wet organic pigment containing 40% by wt CCl4
is to be dred
to 4% by wt CCl4. The fresh
recycled air is entering the dryer with 0.44 kg CCl4/
kg dry air. The air leaves the dryer at 0.945 kg CCl4/
kg day air. The capacity of dryer is 250 kg bone
dry solid/hr. Calculate the ratio of recycled
air to the
fresh feed. Assume that the fresh an entering has no CCl4.​

Answer 1

Answer:

wt of wet organic pigment = 35 kg /100 kg of CCL4

wt of CCL4 = 100 kg

wt of pigment = 5 kg /100 kg of CCL4

Drier is to operate adiabatically with fresh air + recycle air entering the drier = 0.43 kg of CCL4 / kg of dry air

the air leaves the drier ...