Diploma engineering college

GUJARAT UNIVERSITY

B.E. (Chemical Engineering)

CH 801 Heterogeneous reaction and catalysis

Sr. No.	Subject	Teaching Scheme (Hrs.)			Exam Scheme (Marks)
		Lect	Tut	Pract	Theory 3 Hrs.	Sessional	T/W	Pract	Total
CH-801	Heterogeneous reaction and catalysis	3	-	3	100	50	25	50	225

1.Non Ideal Flow‚ Residence time distribution, The E.F. and C. Curves. Their inter relationship, ways of using age distribution function, Models for nonideal flow, Dispersion model, Chemical Reaction and dispersion. Intensity of fluid mixing. Tanks in series model conversion, Multiparameter model, Deviation from plug flow, Models for real stirred tanks.

2.Mixing of Fluids‚ Self mixing of single fluid, degree of segregation, Early and late mixing, models for partial segregation, Mixing of two miscible fluids, Product distribution in multiple reactions.

3.Kinetics and Design for uncatalyzed Heterogeneous system:

Rate equation for heterogeneous reactions, Combining linear rate expressions. Combining non-linear rate equations. Contacting patterns for two-phase systems.

4.Fluid Fluid Reactions ‚ Rate equation, Kinetic regimes for mass transfer and reaction. Rate equations for instantaneous reactions. Fast and intermediate rate equatrions. Rate equation for slow reaction rate equation for infinitely slow reaction, film conversion parameter M Towers for fast and slow reactions, mixer settlers. Semi batch contacting patterns. Reactive distillation and extractive reactions.

5.Fluid particle Reactions Selection of a model. Unreacted core models for unchanging size spherical particles. Spherical particles of changing size, Diffusion through gas film and through ash layer controlling chemical reaction controlling.

Shrinking spherical particles.

Plug and mixed flow of unchanging size solids under uniform gas composition, particles of single size and mixture of particles of various sizes. Fluid and fixed beds with solids entrainment, instantaneous reactions.

6.Catalysts‚ Physical properties of catalyst, surface area, void volume, solid density pore volume distribution, Classification and preparation of catalyst, catalyst promotors. Catalyst inhibitors, Catalyst poisons, Nature and Mechanism of Catalytic reactions, Physical and chemical absorption.

7 Porous Catalyst‚ Interpellet heat and mass transfer. Mass transfer with chemical reaction. Effect of internal resistances of selectivity and poisoning.

8. Deactivating Catalyst‚ Mechanism and rate equation for catalyst deactivation. Batch solids, rate for independent deactivation, Parallel, series and side by side deactivation.

Flowing solids, Experimental reactors, mechanism of decay from experiment, design and performance with a batch of decaying catalyst, Reactor with fresh flowing catalyst. Reactor and regenerator with deactivating catalyst.

9. Solid catalyzed reactions ‚ Rates of chemisorptions. Adsorption isotherms and rates of adsorption and desorption. Adsorption desorption rate controlling surface reaction rate controlling, Quantitave interpretation of kinetic data, Experimental methods of finding rates, Differential, integral, mixed batch and recycle reactors. Determining reactor size from rate equations. Product distribution in multiple reactions. Staged adiabatic packed reactors with intercooling. Staged mixed reactors, bubbling bed model.

10. Fixed bed Reactors ‚ Global reaction rates. Mass energy balance equation for fluid flowing through bed of catalyst. Isothermal and adiabatic reactors, Heat transfer through reactor wall, Wall Film coefficient, Effective thermal conductivity, One and two dimensional model, Calculations of external concentration difference and temperature difference with negligible and finite diffusion resistances. Effect of external resistance on selectivity.

11. Slurry Reactors‚ Effect of external transport resistance on global rate of reaction, Mass transfer between gas bubble and bulk liquid. Mass transfer between bulk liquid to catalyst particle, Effect of mass transfer on observed rates. Determination of volume and conversion in slurry reactors.

12. Fluid bed Reactors‚ Heat transfer and mixing in fluidized bed. heat transfer to wall, Conversion in plug flow with axial dispersion, model. bubbling bed model. Duel reactors and trickle bed reactors.

13. Industrial application‚ Examples illustrations based on cracking of hydrocarbons, alkylation’s, nitration, ammination, sulfonation, sulfation, halogenations, hydrogenation, esterification, hydrolysis, oxidations, and polymerizations with special reference to reactors utilized in the above unit processes.

Term Work and Practical:

Experiments based on kinetics of heterogeneous reactions, fluid reactions in towers, mixers, settlers etc

Text Books:

1. Octave Levenspiel, “Chemical Reaction Engineering”, 3rd Edition, John Wiley & Sons (Asia) Pte Ltd. (1998), ISBN: 978-0-471-25424-9.

Reference Books:

1. H. Scott Fogler, “Elements of Chemical Reaction Engineering” 3rd Edition November, Prentice Hall of India Pvt Ltd.

2. L. D. Schmidt, “The Engineering of Chemical Reactions”, Oxford Press.

3. J.M. Smith, “Chemical Engineering Kinetics”, 2^nd, McGraw-Hill.

4. M.M. Sharma and LK. Doraiswami, “Heterogeneous Reactions and Mass transfer”