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5%) 2) The following F curve was obtained from a tracer test on a real reactor 

a) Can you suggest a system of ideal reactors to model the real reactors?

 b) hat conversion can be e!"ected for a 2nd order reaction

 2#$    2%

with $ & ''2 dm3mols ?

The entering concentration of # is *5 +

DQE May 2000

*) The gas "hase isomeri,ation

 #  →  %

is to be carried out in this reactor -!"eriments were carried out in a reactor that had the following

.T/

-(t) & *' e 0*'t

  min 0*

where t is in minutes

a) 1f the volumetric flow rate was 2 dm3min the conversion was *% what was the reactor

volume?

4 &  

 b) hen the volumetric flow rate was '2 dm3min the conversion was 5'% hen the volumetric

flow rate was ''2 dm3min the conversion was *% hat will the conversion be when the

volumetric flow rate is *' dm3min?

6 &  

c) This reaction is now to be carried out in a * dm3 "lug flow reactor at a volume metric flow rate

of * dm3min hat will be the conversion?

6 &  

t (min)

F

4

0.7

0.3

0

1

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d) 1t is "ro"osed to carry out the reaction in a *' m diameter "i"e where the flow is highly turbulent

(.e&*'7) There are significant dis"ersion effects The su"erficial gas velocity is * ms 1f the

 "i"e is 7 m long what conversion can be e!"ected 1f you were unable to determine the reaction

order and the s"ecific reaction rate constant in "art (b) assume 8 & * min 0* and carry out the

calculation9

6 &  

2) Consider the gas "hase n:meri,ation reaction

 n#   →  #

n ;e! 2#  →  #2<

The order of the reaction is un$nowna) =nder isothermal and isobaric conditions "rove that a C>T. and a F. will re@uire almost

identical volumes to attain a s"ecific conversion if nAA*

 b) 1f n is not much higher than * which reactor do you e!"ect to re@uire more volume to attain as"ecific conversion 0 C>T. or F.?

DQE May 1999

DQE January 1999

*) The following li@uid en,ymatic reactions with substrate inhibition

 

-+>  → 

←  -B >

>+-B >  → 

←  >B -B >

-B >  →  ?+-

were carried out in a non:ideal reactor

hich model (segregation model or ma!imum mi!edness model) and under what reactionconditions would "redict the greatest conversion of substrate >

-!"lain your reasoning

DQE May 1998

* The first order isomeri,ation is carried out in a flow reactor

# k   → 

with k  & '* min 0*

The volumetric flow rate to the reactor is 2 dm3min The outlet concentration of a "ulse in"ut tracer

is shown below as a function of time in minutes

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C(mgdm 3)

*

2

5 *' *5

3

5

7

t (min)

a) hat is the reactor volume? b) hat would be the conversion in a F. and in a C>T. of this volume?

c) hat is the conversion "redicted by the segregation model?

d) hat is the conversion "redicted by the ma!imum mi!edness model?e) hat is the conversion "redicted by the tan$s:in:series model?