Chemical Reaction Engineering
In an ideal P.F.R. at steady state conditions

There is no lateral mixing of fluid
There may be diffusion along the flow path
The conversion of the reactant varies from point to point along a flow path
The composition of reactants remains constant along a flow path

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Chemical Reaction Engineering
A space velocity of 5 hr⁻¹ means that

After every 5 hours, reactor is being filled with the feed
Cent per cent conversion can be achieved in at least 5 hours
A fixed conversion of a given batch of feed takes 5 hours
Five reactor volumes of feed (at specified conditions) are being fed into the reactor per hour

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