reactor design for multiple rxns
TRANSCRIPT
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7/24/2019 Reactor Design for Multiple Rxns
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L9-1
Slides courtesy of Prof M L Kraft, Chemical & Biomolecular Engr e!t, "ni#ersity of $llinois, "r%ana-Cham!aign
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'e#ie() $sothermal 'eactor esign$n *ut- +eneration .ccumulation1 Set u! mole %alance for
s!ecific reactor
/ eri#e design e0 in
terms of .for each
reactor
Batch CS2' P3'
4 Put C5is in terms of
.and !lug into r.
6 Plug r.into design e0 & sol#e for the time
7%atch8 or 7flo(8 re0uired for a s!ecific .
or the .o%tained for gi#en , :, time, etc
7;e (ill al(ays loo/
Reaction order
needs to bedetermined.
XAA
A0A0
dXt =N
-r V
XA dX
AV =FA0 -rA0
955: 5 5 d?3 3 r d9
dt + =
A0 A
A
F XV=
-r
5: 5 .: . : :5
. :
C C 2 =PC
1 P 2 =
+ = + n
. 5r
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Slides courtesy of Prof M L Kraft, Chemical & Biomolecular Engr e!t, "ni#ersity of $llinois, "r%ana-Cham!aign
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'e#ie() .nalysis of 'ate ata
@ Constant-#olume %atch reactor for homogeneous reactions) ma
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Slides courtesy of Prof M L Kraft, Chemical & Biomolecular Engr e!t, "ni#ersity of $llinois, "r%ana-Cham!aign
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'e#ie() Method of Ecess. + B A !roducts Sus!ect rate e0 -r.
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Slides courtesy of Prof M L Kraft, Chemical & Biomolecular Engr e!t, "ni#ersity of $llinois, "r%ana-Cham!aign
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'e#ie() ifferential Method
1 Plot C.Ht #s t
/ etermine dC.Hdt from !lot %y
gra!hical or numerical methods
a8 ra( rectangles on the gra!h2hen dra( a cur#ed line so that
the area a%o#e the cur#e that is
cut off of each rectangle
a!!roimately fills the unfilled
area under the cur#e%8 -dC.Hdt is read using the #alue
(here the cur#e crosses a
s!ecified time
4 Plot ln7-dC.Hdt8#s ln C.
: :
;here r.
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L9-G
Slides courtesy of Prof M L Kraft, Chemical & Biomolecular Engr e!t, "ni#ersity of $llinois, "r%ana-Cham!aign
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'e#ie() $ntegral Method
@ . trial-and-error!rocedure to find reaction order
@ uess the reaction order integrate the differential
e0uation
@ Method is used most often (hen reaction order is
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Slides courtesy of Prof M L Kraft, Chemical & Biomolecular Engr e!t, "ni#ersity of $llinois, "r%ana-Cham!aign
3or the reaction . !roducts
3or a first-order reaction - r. < C.ln 7C.:HC.8
t
3or a second-order reaction - r. < C.2
1HC.
t
3or a ero-order reaction -r.