Homework-5-Spring-2010

Homework-5-Spring-2010 -...

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Unformatted text preview: A
packed
bed
reactor
uses
0.5
cm
diameter
catalyst
particles
packed
in
a
4
cm
inner
diameter
tubular
 reactor.


The
void
fraction
is
0.45.

The
catalyst
density
is
2000
kg/m3.


Assume
that
the
pressure
drop
 in
a
packed
bed
reactor
is
described
by
Eqn
4.30,
with
α=.02
kg‐1.

 
 A
gas‐phase
reaction
is
conducted
in
the
reactor,
with
stoichiometry

A+2B goes to 3C+2D. The
rate
 expression
is
 .

The
reaction
rate
constant
k

is
24,000
L2mol‐1(kg
catalyst)‐1hr‐1.
 The
pressure
at
the
reactor
inlet
is
10
atmospheres.


The
ambient
pressure
is
1
atmosphere.
 
 The
feed
to
the
reactor
contains
25%
A,
60
%
B,
and
15%
inert
gas.

The
inlet
flow
rate
is
8
m3
hr‐1.

The
 reactor
is
operated
so
that
the
temperature
is
constant
at
300
C.
 A) B) C) D) What
conversion
can
be
reached
in
a
8
m
reactor?
 Plot
P,
X,
CB,
CC,
CD

vs
length
 What
would
the
conversion
have
been
if
we
neglected
pressure
drop
(set
alpha
to
0)
 When
catalysts
are
loaded
into
a
reactor,
breakage
can
occur
if
the
loading
is
not
done
carefully.

 If
the
catalyst
size
is
decreased
by
a
factor
of
2,
the
value
of
α
quadruples
to
.08
kg‐1.


What
is
 the
effect
on
conversion?

Check
the
pressure
drop!
 E) What
is
the
effect
on
conversion
of
decreasing
the
percent
A
to
20%,
with
concomitant
increase
 in
inerts
to
20%?


The
effect
on
rate
of
production
of
C?
 
 ...
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This note was uploaded on 04/25/2010 for the course CHEN 4330 taught by Professor Staff during the Spring '08 term at Colorado.

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