Elements of
Chemical Reaction Engineering
6th Edition



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Essentials of
Chemical Reaction Engineering
Second Edition

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Chapter 9: Reaction Mechanisms, Pathways, Bioreactions and Bioreactors

Additional Homework Problems

CDP9-JB

(a)  Use the supplementary reading to give three examples each of polymers formed by step polymerization and by chain polymerization. Describe the monomers, structural unit(s) and repeating unit in each case.
(b) Plot yj, wj as a function of j for degrees of polymerization of 5, 10, and 20. Plot P10 as a function of conversion of functional groups, p, for Mo= 1 mol/dm3
(c)  Plot yj, and wj as a function of j for free radical termination by combination for p=0.8, p=0.9 and p=0.95.
(d)  Determine the molecular weight distribution for the formation of polystyrene for an initiator concentration of 10-3 molar and a monomer concentration of 3 molar. What are , , and the polydispersity, D, after 40 hrs? How would the change if chain transfer were neglected?
(e)  The polymerization of styrene is carried out in a batch reactor. Plot the mole fraction of polystyrene of chain length 10 as a function of time for an initial concentration of 3M and 0.01M of monomer and initiator respectively. The solvent concentration is 10 molar.