Mass Transfer Operations I — Winter 2025

Define: Plait point, selectivity and distribution coefficient in liquidliquid extraction

Discuss the factors affecting choice of separation method

Discuss in detail about Steady State Cocurrent processes

Explain mass transfer operation between two immiscible phases

Deduce an equation for molar flux for diffusion of component Athrough non-diffusing component Bin case of steady state molecular diffusion for liquid phase

With neat sketch, explain spray tower and sparged vessel as G-Lequipment in brief.

Explain the following terms with respect to tray towers: (i) Flooding (ii)Priming (iii) Coning (iv)Weeping (v) Dumping (vi)Tray Spacing (vii)Theoretical Tray

Compare Ntype flux and Jtype flux.

Compare Penetration theory with surface renewal theory with reference to molecular diffusion

Methane diffuses at steady state through a tube containing helium for the case equimolar counter diffusion. At point 1, the partial pressure of methane is 55 kPa and at point 2, 0.03 m apart is 15 kPa. The total pressure is 101.325 kPa and temperature is 298 k, at this temperature and pressure the value of diffusivity is 6.75 × 10-5 m2 /s. Calculate the partial pressure of methane at point 0.02 m apart from point 1 for the above case

Explain mass, heat and momentum transfer analogies.

Classify gas-liquid mass transfer operations with principle.

Oxygen (A) is diffusing through carbon monoxide (B) under steady state condition with carbon monoxide non-diffusing. The total pressure is 1×105 N/m2 and temperature is 00C. The partial pressure of oxygen at two planes 2.0 mm apart is respectively 13000 and 6500 N/m2. The diffusivity for the mixture is 1.87×10-5 m2 /s. Calculate the rate of diffusion of oxygen in kmol/s through each square meter of the two planes

Define the following terms with respect to tray tower a) Priming b) Coning c) Weeping

Explain the characteristics of fill for packed tower

Explain “two resistance theory” briefly1

Define the following terms with respect to tray tower a) Flooding b) Dumping c) Tray Spacing

Explain mass, heat and momentum transfer analogies

Explain the prevention of vortex formation in mechanically agitated vessel.

Define: a) Absorption factor b) Crystallization c) selectivity of solvent

Explain Meir’s super saturation theory of crystallization.

Explain Ternary liquid- liquid equilibrium and tie line

Define: a) Recoverability of solvent b) absorption c) striping

Define super saturation and explain Meir’s super saturation theory. Explain stages of crystallization. Explain stages or mechanism of crystallization.

Discuss the system of three liquids- one pair partially soluble and the effect of temperature on ternary equilibria.