## EL3491 Syllabus - Mass Transfer - 2021 Regulation Anna University

EL3491

MASS TRANSFER

LTPC

3003

UNIT I

MOLECULAR DIFFUSION

9

Introduction to mass transfer operations; Molecular diffusion in gases, liquids and solids; diffusivity measurement and prediction; multi-component diffusion.

UNIT II

CONVECTIVE TRANSFER AND INTERPHASE MASS TRANSFER

9

Eddy diffusion, concept of mass transfer coefficients, theories of mass transfer, different transport analogies, application of correlations for mass transfer coefficients, inter phase mass transfer, relationship between individual and overall mass transfer coefficients.

UNIT III

ABSORPTION

9

Gas Absorption and Stripping – Equilibrium; material balance; limiting gas-liquid ratio; tray tower absorber - calculation of number of theoretical stages, tray efficiency, tower diameter; determination of height of packing using HTU and NTU calculations.

UNIT IV

DISTILLATION

9

Vapour liquid equilibria - Raoult’s law, Principle of distillation - flash distillation, differential distillation, steam distillation, multistage continuous rectification, Number of ideal stages by Mc.Cabe - Thiele method, Total reflux, minimum reflux ratio, optimum reflux ratio.

UNIT V

LEACHING & EXTRACTION

9

Liquid - liquid extraction - solvent characteristics-equilibrium stage wise contact calculations for single stage extraction, multi-stage cross current extraction, multi-stage counter current operation. Solidliquid equilibria- equilibrium diagram for leaching, single stage leaching, multi stage continuous cross 62 current and counter current leaching, stage calculations, stage efficiency.

TOTAL: 45 PERIODS

COURSE OUTCOMES: On completion of the course students are expected to
CO1: Understand the fundamentals, types and mechanism of mass transfer operations.
CO2: Understand the theories of mass transfer and the concept of inter-phase mass transfer.

TEXT BOOKS:
1. K Asokan, Mass Transfer concepts, University Press 2. Robert Ewald Treybal, “Mass Transfer Operations” McGraw Hill Education India

REFERENCES:
1. D.Q. Kern, “Process Heat Transfer”, Eighteenth Reprint, McGraw Hill, New York, 2008.
2. J.M.Coulson and J.F. Richardson with J.R.Backhurst and J.H.Harker, “Coulson and Richardson’s chemical Engineering”, Vol.1, “Fluid Flow, Heat Transfer and Mass Transfer”, Butterworth Heinmann, 6th Edition, 2000.