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 , for a non-isothermal reactor
τ and θ are always equal
τ = θ , when the fluid density changes in the reactor

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Chemical Reaction Engineering
An endothermic aqueous phase first order irreversible reaction is carried out in an adiabatic plug flow reactor. The rate of reaction

Goes through a maximum along the length of the reactor
Is maximum at the inlet of the reactor
Goes through a minimum along the length of the reactor
Is maximum at the exit of the reactor

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