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Course Co-ordinated by IIT Bombay
Coordinators
 
Prof. A.K. Suresh
IIT Bombay

 

 

 

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This is a typical second course in the subject of chemical reaction engineering with an emphasis on heterogeneous reaction engineering and nonideal reactors. Catalysis, mechanistic treatment of rate forms and the practical issues of transport limitations, leading finally to design considerations, form the first part. Kinetics and design of reactors for noncatalytic gas-liquid and fluid-solid reactions follows, and the last part of the course deals with the subject of residence time distributions, and how they can be used to characterize and design non-ideal reactors. The course thus consists of the following modules:

  1. Catalysis and Kinetics of heterogeneous catalytic reactions
  2. Transport effects in catalytic reactors (External and pore diffusion)
  3. Catalytic reactor design
  4. Multiphase reactors (gas-liquid and fluid-solid reactions)
  5. Residence time distributions and nonideal reactors

Lecture no.

Title

Keywords

Delivered by

1

Introduction to catalysts and catalysis

Catalysts and catalytic reactors, heterogeneous catalyst, activation energy, porous structure, types of catalysts, adsorption

Sanjay Mahajani

2

Steps in catalytic reaction: adsorption, desorption and reaction

Steps in catalysis, adsorption, desorption, surface reaction, types of catalytic reactors, adsorption isotherm, single site, dual site mechanisms, Langmuir Hinshelwood,  Eley Rideal, Rate controlling steps

Sanjay Mahajani

3

Derivation of the rate equation

Rate controlling steps, Rate law for hetergeneous reaction, Derivation of rate equation, Catalytic sites, Equilibrium, Site balance 

Sanjay Mahajani

4

Heterogenous data analysis for reactor design - I

Deduce mechanism; reactor design

Ganesh Viswanathan

5

Heterogenous data analysis for reactor design - II

Fluidized reactor; Case study: Germanium epitaxial growth

Ganesh Viswanathan

6

Catalyst deactivation and accounting for it in design – I

Deactivation; Rate law; Modes of deactivation

Ganesh Viswanathan

7

Catalyst deactivation and accounting for it in design – II

Poisoning; Fluidized CSTR; Moving bed reactor

Ganesh Viswanathan

8

Synthesize the rate equation

Experimental data, dehydrogenation of cyclohexane, validation, laboratory reactors for catalytic reactions, differential reactors, slurry reactor, least square method

Sanjay Mahajani

9

Introduction to intraparticle diffusion

Internal (intraparticle) diffusion, wall effect, tortuosity, porosity, effective diffusivity, constriction, flux, differential balance, types of rate constants and their units, concentration profile inside the catalyst, Thiele modulus

Sanjay Mahajani

10

Intraparticle diffusion: Thiele modulus and effectiveness factor Part I

Concentration profile inside the catalyst, effectiveness factor, Derivation of effectiveness factor, Thiele modulus

Sanjay Mahajani

11

Intraparticle diffusion: Thiele modulus and effectiveness factor Part II

Diffusion limited reaction, reactor design, effectiveness factor, spinning basket reactor, apparent order, apparent activation energy, non-isothermal effectiveness factor

Sanjay Mahajani

12

Intraparticle diffusion: Thiele modulus and effectiveness factor Part III

Exothermic reaction, thermal conductivity of catalyst, multiple steady states, endothermic reaction, catalyst geometries, catalyst slab   

Sanjay Mahajani

13

Effectiveness factor and Introduction to external mass transfer

Effect of catalyst particle diameter, external mass transfer, boundary layer, mass transfer coefficient, rate controlling mechanism

Sanjay Mahajani

14

External Mass Transfer

External mass transfer coefficient, Reynolds number, Schmidt number, Sherwood number, interfacial area, fixed bed reactor

Sanjay Mahajani

15

Implications to rate data interpretation and design I

Weisz-Prater criterion; Mears’criterion; Packed-bed reactor design

Ganesh Viswanathan

16

Implications to rate data interpretation and design II

Generalized criterion; Network of first order reactions; Vector of effectiveness factors

Ganesh Viswanathan

17

Packed-bed reactor design

Different configurations; Packed-bed reactor design: First order reaction, Second order reaction

Ganesh Viswanathan

18

Fluidized bed reactor design I

Kunii-Levenspiel model: Basic principles

Ganesh Viswanathan

19

Fluidized bed reactor design II

Different regimes; Mass transport in fluidized beds; First order reaction; resistances

Ganesh Viswanathan

20

Gas-liquid reactions-1: Theories of mass transfer into agitated liquids

Mass transfer into agitated liquids; Film theory, Penetration theory

A K Suresh

21

GLR-2: Effect of chemical reaction on mass transfer: the slow reaction regime

Film theory, pseudo-first order, Hatta number, slow reaction regime, kinetic sub-regime, diffusional sub-regime

A K Suresh

22

GLR-3: Transition to fast reaction, and the Fast reaction regime

Film theory, Enhancement factor; transition to fast reaction, Fast reaction regime

A K Suresh

23

GLR-4: Fast reaction example; Instantaneous reaction regime

Film theory, second order case; Instantaneous reaction; limiting enhancement; enhancement factor plot

A K Suresh

24

GLR-5: Transition to Instantaneous reaction; Reaction        regimes in surface renewal theories

Film theory, transition from fast to Instantaneous reaction; Surface renewal theories, slow reaction

A K Suresh

25

GLR-6: Reaction regimes in surface renewal theories (contd..)

Surface renewal theories, transition to fast reaction, fast reaction regime, comparison of surface renewal and film theories, Danckwerts’ plot, second order reaction with mass transfer

A K Suresh

26

GLR-7: Surface renewal theories: Instantaneous reaction and Summing up

Surface renewal theories, Instantaneous reaction, reactor design

A K Suresh

27

NOT USED

 

A K Suresh

28

Fluid-solid non-catalytic reactions I

Modes; Basic principles; Progressive-conversion model; Shrinking core model

Ganesh Viswanathan

29

Fluid-solid non-catalytic reactions II

Gas film diffusion control; Ash layer diffusion control; Surface reaction control

Ganesh Viswanathan

30

Fluid-solid non-catalytic reactions III

Other geometries, Combination of resistances; Case study: Dissolution of monodispersed and polydispersed particles

Ganesh Viswanathan

31

Distribution of residence time

Introduction; Non-ideal reactor examples: Gas-liquid CSTR, Packed-bed reactor, CSTR

Ganesh Viswanathan

32

Measurement of residence time distribution

Pulse input; Step input; RTD functions: E and F-curves

Ganesh Viswanathan

33

Residence time distribution function

Properties: Mean, variance, skewness; RTD of ideal reactors: PFR, CSTR.

Ganesh Viswanathan

34

Reactor diagnostics and troubleshooting

RTD of laminar flow reactors; RTD functions: Perfect operation, Bypassing, Dead volume

Ganesh Viswanathan

35

Modeling non-ideal reactors

Combination of reactors: PFR-CSTR in Series; Mixing: Macro- and Micro-mixing

Ganesh Viswanathan

36

Residence time distribution: Performance of non-ideal reactors

Segregation model; Maximum mixedness model; RTD with multiple reactions

Ganesh Viswanathan

37

Non-ideal Reactors: Tanks-in-series model 

Non-ideal reactors, tank-in-series model, one parameter model, axial mixing, variance, E curve

Sanjay Mahajani

38

Non-ideal Reactors: Dispersion model

Dispersion model, closed-closed vessel, open-open vessel, Peclet number, E curve

Sanjay Mahajani

39

Non-ideal Reactors: Dispersion model and introduction to multiparameter models

Dispersion model, Damkohler number, conversion in non-ideal tubular reactor, two parameter model, dead zones, bypass, E curve 

Sanjay Mahajani

40

Non-ideal Reactors: Multiparameter models

Tracer experiment, multiparameter model, ideal reactor network, E curve

Sanjay Mahajani

 

 

Chemical Reaction Engineering -I.


  1. H.S. Fogler, Elements of Chemical Reaction Engineering, Fourth Ed., Prentice-Hall, New Jersey (2005).
  2. O. Levenspiel, Chemical Reaction Engineering, Third Ed., J. Wiley & Sons, NY (1999).
  3. Danckwerts, P.V. Gas-Liquid Reactions, McGraw-Hill, NY (1970)

  1. Sharma, M.M. and Doraiswamy, L.K. Heterogeneous reactions: Analysis, Examples and Reactor Design. Vols. I & II, John Wiley and Sons, NY, 1984.
  2. Froment, G.F. and Bischoff, K. B. Chemical Reactor Analysis and Design, II Ed., John Wiley and Sons, NY, 1990.


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