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Chemical Reaction Engineering

Chemical Reaction Engineering
The dispersion number of perfect mixed flow is

< 2100
> 150
∞

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

1.5 K
0.693/K
2.5 K
6.93 K

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Chemical Reaction Engineering
A first order gaseous phase reaction is catalysed by a non-porous solid. The kinetic rate constant and the external mass transfer co-efficients are k and kg respectively. The effective rate constant (keff) is given by

keff = k + kg
keff = (k+ kg)/2
1/keff = 1/k + 1/kg
keff = (kkg)1/2

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Chemical Reaction Engineering
Which of the following is used for calcination of limestone and dolomite in industrial practice?

Fixed bed reactor
Fluidised bed reactor
Moving bed reactor
None of these

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Chemical Reaction Engineering
An autothermal reactor is

Completely self-supporting in its thermal energy requirements
Most suitable for a second order reaction
Isothermal in nature
Most suitable for a reversible reaction

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Chemical Reaction Engineering
The order of a chemical reaction is

Never fractional
None of these
Always equal to the total stoichiometric number of reactants
An experimentally determined quantity

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