Chemical Reaction Engineering
For identical flow rate and feed composition, X plug flow reactors (PER) in series with a total volume V gives the same conversion as single

CSTR of volume V
CSTR of volume V/X
PFR of volume V
PFR of volume V/X

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Chemical Reaction Engineering
For a tubular reactor with space time 'τ' and residence time 'θ', the following statement holds good.

τ = θ , for an isothermic tubular reactor in which the density of the process fluid is constant
τ = θ , when the fluid density changes in the reactor
τ = θ , for a non-isothermal reactor
τ and θ are always equal

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Chemical Reaction Engineering
In solid catalysed reactions the diffusional effects are more likely to affect the overall rate of reaction for

Fast reactions in catalyst of small pore diameter
Fast reaction in catalyst of large pore diameter
Slow reactions in catalyst of large pore diameter
Slow reactions in catalyst of small pore diameter

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