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Chemical Reaction Engineering

Chemical Reaction Engineering
In a reaction, the threshold energy is equal to (where, A = activation energy N = normal energy of reactants)

A
A-N
N
A+N

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Chemical Reaction Engineering
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

1.60
1.33
2.67
0.80

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Chemical Reaction Engineering
Velocity of a reaction depends upon the

Nature of the reactants
Concentration of the reactants
All of these
Temperature at which the reaction is carried

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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

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

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Chemical Reaction Engineering
A backmix reactor

Employs mixing in axial direction only
Is most suitable for gas phase reaction
Is same as plug-flow reactor
Is same as ideal stirred tank reactor

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Chemical Reaction Engineering
With increase in the space time of an irreversible isothermal reaction being carried out in a P.F. reactor, the conversion will

Data in insufficient; can't be predicted
Increase
Decrease
Remain same

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