4. TUBULAR REACTORS WITH LAMINAR FLOW
Tubular reactors in which homogeneous reactions are conducted can be empty or packed conduits
of various cross-sectional shape. Pipes, i.e tubular vessels of cylindrical shape, dominate. The
flow can be turbulent or l
ChE 505 Chapter 7N: Appendix
Updated 02-08/05
Chapter 7: Appendix
Diffusion: A General Treatment of Molecules and Ions
We have seen that diffusion may be regarded as the net movement of solutes in solution (or in gas phase)
due to a concentration gradient
CHE 471
LECTURE 5B
PRECISION OF KINETIC MEASUREMENTS:
Random errors can never be completely avoided in kinetic measurements but we can
often estimate the maximum possible error in our measurements of concentrations,
temperature fluctuations, etc.
In gener
UPDATED 02/10/03 - AW
7A. A BRIEF SUMMARY OF ELEMENTARY GAS-PHASE REACTIONS
We will classify these as:
- bimolecular
- trimolecular
- unimolecular
7A-1. Bimolecular Reactions
Bimolecular gas phase reactions can occur:
between two molecules
between a free
CHE 471
LECTURE 5A
EXAMPLES OF EVALUATION OF RATE FORMS FROM KINETIC
DATA IN BATCH SYSTEMS
EXAMPLE 1: Determine the reaction order and the rate constant for a single reaction of
the type A products based on the following experimental information obtained
ChE 512 Course Notes
Chapter 2
2.
CHARACTERIZATION OF MACROMIXING
2.1
Residence Time Distributions, What are they?
In describing a
flow pattern in any flow system, reactors in particular, since the hydrodynamic
equations of flow are too complex to solve,
5.4 Application of Perturbation Methods to the Dispersion Model for Tubular Reactors
The axial dispersion model for tubular reactors at steady state can be described by the following
equations:
1 d 2 c dc
Rn c n = 0
2
Pe dz
dz
1 dc
z= 0
1=c
Pe dz
dc
z=
5. THE AXIAL DISPERSION MODEL
The axial dispersion model can readily be extended to apply to turbulent flow conditions. Under
such conditions the velocity profile is almost flat and averaging with respect to radial position is
possible. The axial dispersi
ChE 512
Spring 2004
Updated 01/05
Chemical Reaction Engineering Notes
M. P. Dudukovic
1.
EFFECT OF MIXING ON REACTOR PERFORMANCE FOR
HOMOGENEOUS SYSTEMS - INTRODUCTION
In dealing with homogeneous reaction systems we have seen that basically all problems e
5.2 Mixing in a Pipeline
When instead of a reactor problem we deal with problems of mixing of one material that flows
after another as both are being pumped through the same pipe line, we use the dispersion or
Taylor diffusion model (depending whether the
5.1 Addenda: (Inversion of the Transfer Function for the Dispersion Model)
It might be instructive to show how to obtain the solution to eq (109) and the effect of B.C. on
that solution.
By taking the Laplace transform of eq (109) we get
1 d 2 c dc
sc =
ChE 471
Lecture 6
October 2005
Ideal Reactors and Multiple Reactions
Isothermal Operation
Selection of a proper flow pattern is the key factor in achieving desired selectivities and yields in
multiple reactions. For every multiple reaction system of known