ABSTRACT
In this experiment the performance of the homogeneous tubular reactor was
studied. A reaction between caustic soda and ethyl acetate was performed in
a plug flow reactor. A 25 ml sample was taken out from the reactor at
different times for different flow rates. The sample was quenched with an
acid to stop the reaction then it was titrated. The steady state concentration
of the unreacted NaOH was found 0.0244, 0.031 and 0.0346 M while the
conversion was found as 0.512, 0.38 and 0.344 for the flow rates of 50, 100
and 150 of the reactants respectively. The theoretical values of the
concentration were found as 0.0216, 0.0306 and 0.0351 M where as the
conversion was found as 0.569, 0.389 and 0.299 for the three different flows
rate respectively. The space time also was calculated for each run to be 4
min for the first one, 1.93 min for the second and 1.29 min for the last one.
The percentage difference for the concentration ranged between 0.65 and
11.11 and between 0.82 and 11.17 for the conversion.
INTRODUCTION
Batch, continuous stirred tank (CSTR), and tubular (plug) reactors are
three commonly types of homogenous reactors.
Tubular reactors or plug
flow reactors have extensive application in industry because of the absence
of the moving part.
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THEORETICAL BACKGROUND
Since the concentration of the reactant will change along the axial
path of the reactor flow, an element volume differential mass balance was
made to give us
C
A0
dV
C
Af
F
A0
__________________
:
___
:
______________________
X
A0
===>
FA, X
A
>
:
:
>F
A
+dF
A
, X
A
+dX
A
===> F
Af
,
V
f
V
0
__________________
:
___
:
______________________
X
Af
The mass balance is
input
=output + disappearance by reaction + accumulation
(1)
Where:
input of A, (moles/time)
= F
A
output of A, (moles/time)
= F
A
+ dF
A
disappearance of A by reaction (moles/time) = r
A
* dV
Substituting back these three terms into Eq. (1); then we get:
F
A
=
(F
A
+ dF
A
)
+
(r
A
) * dV
(2)
knowing that, dF
A
=
d[F
A0
(1X
A
)]
=
F
A0
dX
A
Equation (2) becomes:
F
A0
dX
A
=
r
A
dV
Integrating for the reactor as whole, gives:
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 Fall '08
 AbdullahAlShammari
 Fluid Dynamics, Reaction, Plug flow reactor model, Theo.

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