Chemical Reaction Engineering

Question: At a given temperature, K1, K2 and K3 are equilibrium constants for the following reactions 1, 2, 3 respectively.CH4(g) + H2O(g) CO(g) + 3H2(g), CO(g) + H2O(g) CO2(g) + H2(g)CH4(g) + 2H2O(g) CO2(g) + 4H2(g)Then K1, K2 and K3 are related as:
[A].

K3 = K1.K2

[B].

K3 = (K1.K2)0.5

[C].

K3(K1+K2)/2

[D].

K3 = (K1.K2)2

Answer: Option A

Explanation:

No answer description available for this question.

Question: The catalytic converter for conversion of SO2 to SO3 by contact process should have a feed with SO2 content between
[A].

2-5%

[B].

7-10%

[C].

12-15%

[D].

20-25%

Answer: Option B

Explanation:

No answer description available for this question.

Question: From among the following, choose one which is not an exothermic process.
[A].

Methanol synthesis

[B].

Catalytic cracking

[C].

Ammonia synthesis

[D].

Oxidation of sulphur

Answer: Option B

Explanation:

No answer description available for this question.

Question: In the hydrodealkylation of toluene to benzene, the following reactions occur:C7H8 + H2 C6H6 + CH42C6H6 C12H10 + H2Toluene and hydrogen are fed to a reactor in a molar ratio 1:5.80% of the toluene gets converted and the selectivity of benzene(defined as moles of benzene formed/moles of toluene converted) is 90%. The fractional conversion of hydrogen is
[A].

0.16

[B].

0.144

[C].

0.152

[D].

0.136

Answer: Option B

Explanation:

No answer description available for this question.

Question: An irreversible aqueous phase reaction, A + B P, is carried out in an adiabatic mixed flow reactor. A feed containing 4kmole/m3 of each A and B enters the reactor at 8m3 /hr. If the temperature of the exit stream is never to exceed 390 K, what is the maximum inlet feed temperature allowed?Data: Heat of reaction = – 50 kJ/moleDensity of the reacting mixture = 1000kg/m3Specific heat of reacting mixture = 2kJ/kg.K The above data can be assumed to be independent of temperature and composition.
[A].

190

[B].

290

[C].

390

[D].

490

Answer: Option B

Explanation:

No answer description available for this question.

Question: A second order liquid phase reaction, A B, is carried out in a mixed flow reactor operated in semi batch mode (no exit stream). The reactant A at concentration CAF is fed to the reactor at a volumetric flow rate of F. The volume of the reacting mixture is V and the density of the liquid mixture is constant. The mass balance for A is
[A].

[B].

[C].

[D].

Answer: Option D

Explanation:

No answer description available for this question.

Question: Consider a reversible exothermic reaction in a plug flow reactor. The maximum and minimum permissible temperatures are Tmax and Tmin respectively. Which of the following temperature (T) profiles will require the shortest residence time to achieve the desired conversion.
[A].

[B].

[C].

[D].

Answer: Option B

Explanation:

No answer description available for this question.

Question: A pollutant P degrades according to first order kinetics. An aqueous stream containing P at 2 kmole/m3 and volumetric flow rate 1m3 /h requires a mixed flow reactor of volume V to bring down the pollutant level to 0.5 kmole/m3 . The inlet concentration of the pollutant is now doubled and the volumetric flow rate is tripled. If the pollutant level is to be brought down to the same level of 0.5 kmole/m3 , the volume of the mixed flow reactor should be increased by a factor of
[A].

7

[B].

6

[C].

3

[D].

7/3

Answer: Option A

Explanation:

No answer description available for this question.

Question: An isothermal aqueous phase reversible reaction, P R, is to be carried out in a mixed flow reactor. The reaction rate in k.mole/m3 .h is given by, r = 0.5CP – 0.125CR. A stream containing only P enters the reactor. The residence time required (in hours) for 40% conversion of P is
[A].

0.80

[B].

1.33

[C].

1.60

[D].

2.67

Answer: Option C

Explanation:

No answer description available for this question.

Question: For an isothermal second order aqueous phase reaction, A B, the ratio of the time required for 90% conversion to the time required for 45% conversion is
[A].

2

[B].

4

[C].

11

[D].

22

Answer: Option C

Explanation:

No answer description available for this question.