Mass Transfer
Which of the following is used for the concentration of rubber latex?

Agitated film evaporator
Short tube evaporator
Long tube vertical evaporator
Calendria

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Mass Transfer
Flights in a rotary dryer are provided to

Increase the residence time of the solid
None of these
Reduce the residence time of solid
Lift and shower the solids thus exposing it thoroughly to the drying action of the gas

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