CHEMICAL REACTION ENGINEERING QUIZ

Exothermic reactions are best carried out in

CSTR followed by a plug flow reactor

A plug flow reactor followed by CSTR

CSTR in series

A CSTR

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Enzymes (a protein) are catalysts found in organisms. Its efficiency of catalysing a reaction is due to its capacity to lower the activation energy of the reaction. The enzyme ptyalin used for food digestion is present in

Gland

Saliva

Blood

Intestine

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The half life period of a first order reaction is given by (where, K = rate constant. )

2.5 K

0.693/K

1.5 K

6.93 K

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For series reaction, the relative yield

Both A and C hold good

Is always greater for plug-flow reactor than for the single CSTR of the same volume

Statement in A is wrong

Decreases with increasing conversion

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For a heterogeneous catalytic reaction

Free energy of activation is lowered in the presence of catalyst, which remains unchanged at the end of reaction

The surface of the catalyst does not play an important role during reaction

The catalyst does not form an intermediate complex with the reactant

A relatively small amount of catalyst can cause the conversion of large amount of reactants which does not mean that catalyst concentration is important

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Effectiveness factor of a catalyst pellet is a measure of the __________ resistance.

None of these

Chemical reaction

Pore diffusion

Gas film

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The optimum performance for reactors operating in parallel is obtained when the feed stream is distributed in such a way, that the

Space time for each parallel line is same

Larger reactors have more space time compared to smaller ones

Space time for parallel lines is different

None of these

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Design of heterogeous catalytic reactor involves consideration of __________ steps.

Only chemical

Only physical

Neither A nor B

Both A & B

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Fluidised bed reactor is characterised by

Comparatively smaller equipment

Uniformity of temperature

Very small pressure drop

Absence of continuous catalyst regeneration facility

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Kinetics of a solid catalysed reaction can best be studied in a __________ reactor.

Plug-flow

Mixed

Batch

None of these

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