ChE312 MASS TRANSFER OPERATIONS - I

UNIT-I
Molecular diffusion in fluids: Steady-state molecular diffusion in fluids at Rest and in laminar flow, Momentum and heat transfer in laminar flow.
Mass transfer coefficients: Mass transfer coefficients in laminar and turbulent flow, Analogy between momentum, heat and mass transfer in laminar and turbulent flow - correlations for mass transfer coefficients in simple situations, diffusion in solids.

UNIT-II
Interphase Mass Transfer: Equilibrium, Diffusion between phases, Material balances in steady state co-current and counter-current processes.
Absorption: Solubility of gases in liquids, two component systems - ideal and non-ideal solutions - choice of solvent for absorption, single component absorption material balance - counter current multi stage operations, HETP, HTU, NTU concepts for single component absorption in continuous contact equipment - graphical construction for transfer units

UNIT-III
Humidification Operations: Definitions of fundamental terms, psychrometric charts- theory of adiabatic saturation and wet bulb temperature - Lewis relation, gas liquid contact operations - Design of packed bed for humidification and dehumidification, cooling towers, Non-adiabatic operation - evaporative cooling.
Drying: Equilibrium, batch drying, drying rate curve, time of drying calculations, mechanism of batch drying, continuous drying, equipment for batch and continuous drying operations.

UNIT-IV
Equipment for gas-liquid operations: Gas Dispersed: Sparged vessels (bubble columns), mechanically agitated vessels, mechanical agitation of single phase liquids, mechanical agitation, gas liquid contact tray towers. Sieve trays (qualitative treatment), Murphee tray efficiency, and overall tray efficiency.
Liquid dispersed: Venturi scrubbers, wetted-wall towers, spray chambers, packed towers, mass transfer coefficients and packed towers, counter current flow of gas and liquid, end effects and axial mixing, tray Vs packed towers. Design of packed tower for absorption.

Text Books

1. Mass Transfer Operations, Robert E. Treybal, 3rd edition, International Edition, McGraw Hill.

1. Unit Operations of Chemical Engineering, Warren,L., McCabe, Julian C.Smith, Peter Harriot, 7th Edition, McGraw Hill.
2. Transport process and separation process principles, Christie John Geankoplis, 4th edition, PHI
3. Separation Process Principles, J D Seader and E J Henly, John Wiley & sons.
4. Perry's Chemical Engineers Hand Book, Robert H. Perry, 7th edition, McGraw Hill
5. Principles of Mass Transfer and Separation Process, Binay K. Dutta, PHI, New Delhi.