Chemical Engineering - Chemical Reaction Engineering

41. 

Space time in flow reactor is

A. usually equal to the residence time.
B. the reciprocal of the space velocity.
C. a measure of its capacity.
D. both (a) and (b).

Answer: Option D

Explanation:

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42. 

For a first order isothermal chemical reaction in a porous catalyst, the effectiveness factor is 0.3. The effectiveness factor will increase if the

A. catalyst size is reduced or the catalyst diffusivity is reduced.
B. catalyst size is reduced or the catalyst diffusivity is increased.
C. catalyst size is increased or the catalyst diffusivity is reduced.
D. catalyst size is increased or the catalyst diffusivity is increased.

Answer: Option B

Explanation:

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43. 

Cold shot cooling is only practical when the feed temperature is __________ than the reaction temperature.

A. higher
B. much higher
C. lower
D. much lower

Answer: Option D

Explanation:

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44. 

The following gas phase reaction is taking place in a plug flow reactor.

A stoichiometric mixture of A and B at 300 K is fed to the reactor. At 1 m along the length of the reactor, the temperature is 360 K. The pressure drop is negligible and an ideal gas behaviour can be assumed. Identify the correct expression relating the concentration of A at the inlet (CA0), concentration of A at 1m (CA) and the corresponding conversion of A (X).

A.
B.
C.
D.

Answer: Option C

Explanation:

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45. 

The preferred reacting system for oxidation of o-xylene to phthalic anhydride is

A. jacketted liquid phase CSTR.
B. jacketted steam heated multitubular reactor.
C. multitubular reactor with cooling.
D. multistage multitubular reactor with interstage cooling.

Answer: Option A

Explanation:

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