Question

During the liquid phase decomposition of A, two reactions
compete. A one-half order reaction (k1 = 0.025 mol1/2/L1/2/sec)
produces the desired product; whereas, a first order reaction (k2 =
0.008/sec) produces an unwanted impurity. The initial concentration
of A to be used is 8 mol/L and 75% conversion of A is
required.

a) (7 points) If a CSTR is used to achieve this conversion, what
would be the overall yield and selectivity of the desired
product?

b) (4 points) What would the concentration of the desired product
be in the CSTR from a)?

c) (2 points) What conditions and reactors could be used to
maximize the selectivity of the desired product? Justify your
answer.

Answer #1

The reactions:
A→B, r1 =k1
A→C, r2 =k2CA
give 67% selectivity to the desired product B at 75% conversion
of A in a CSTR with a reaction time of 1 min with CAo =2
moles/liter.
(a) What are the selectivity and conversion for this reaction
and feed in a PFTR with τ = 1 min?
(b) What are the conversion and selectivity in this reactor if
CAo =4 mole/liter?
(c) What τ and conversion will give 99% selectivity in a...

Question 2 :
Consider the following gas phase reactions: (flow reactor)
Rxn 1 : A X
k1 = 0.004 (mol/dm3)1/2.min-1
Rxn 2 : A B - k2 = 0.3 min-1.
Rxn 3 : A Y
k3 = 0.25 dm3/mol/min
B is the desired product and X and Y are the foul pollutants
that are expensive to get rid of. The
specific reaction rates are at 27 oC ( 300K).
The reaction system is to be operated at 27 oC and...

Problem 2: Fogler 6-6 (a-g), pg. 363 Consider the following
system of gas-phase reactions: A X ??? 1/2 X A 1 r kC = 3 1/2 1 k =
? 0.004 (mol/dm ) min A B ??? B A 2 r kC = 1 2 k 0.3 min? = A ???Y
2 Y A 3 r kC = 3 3 k = ? 0.25 dm /mol min B is the desired product,
and X and Y are foul pollutants that...

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