Answered: TABLE E15-2.1 DATA FROM A SPINNING…

Introduction to Chemical Engineering Thermodynamics

8th Edition

ISBN:9781259696527

Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Chapter1: Introduction

Section: Chapter Questions

Problem 1.1P

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Estimating the Thiele Modulus and Effectiveness Factor
The first-order reaction
A ⎯⎯→B
was carried out over two different-sized pellets. The pellets were contained in amspinning basket reactor that was operated at sufficiently high rotation speeds that external mass transfer resistance was negligible. The results of two experimental runs made under identical conditions are given in Table E15-2.1.
(a) Estimate the Thiele modulus and effectiveness factor for each pellet.
(b) How small should the pellets be made to virtually eliminate all internal diffusion resistance, e.g., η = 0.95?

TABLE E15-2.1 DATA FROM A SPINNING BASKET REACTOR
Measured Rate (obs)
(mol/g-cat -s) x 105
Pellet Radius
(m)
Run 1
Run 2
3.0
15.0
0.001

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