Process Equipment and Plant Design
Which of the following is not a valid assumption in continuous binary distillation for calculating the number of equilibrium stages by Mc-Cabe-Thiele's method?

Sensible heat changes for vapour & liquid are negligibly small
Molar latent heat of the two components are equal
Heat of mixing of normal liquid is assumed to be zero
Reflux is not a saturated liquid

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Process Equipment and Plant Design
A stuffing box is used for

Facilitating smooth opening and closing of a valve
Absorbing the contraction/expansion of pipeline due to temperature changes
Prevention of fluid leakage around moving parts
Reducing the resistance of fluid flow

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