PHYSICAL CHEMISTRY IN BRIEF

CHAP. 9: CHEMICAL KINETICS [CONTENTS] 324

In a stirred flow reactor the concentrations of the reactants and the reaction rate are con-
stant. Equation (9.169) thus simplifies to

Vr=

1

νi

F

r

(ci−ci 0 ). (9.170)

Note:A stirred flow reactor can be used as a source of direct experimental data on reaction

rates. The rate is calculated from (9.170) if we know the reactor volume, the feed, the

initial and current composition. Compare with the Note in9.3.3.

Example

A first-order reactionA

k

→ P, wherek= 0.1 hour−^1 , is under way. The initial concentration

of the reactant iscA0= 2. 6 mol dm−^3 , the final concentration iscA= 0. 1 mol dm−^3. A total of

nP= 250mol of the product is to be produced in 32.57 hours. Compare the volume of a plug

flow reactor, a stirred flow reactor, and a batch reactor which would be needed for the production

of the given amount of the product.