Chemical Reaction Engineering
For the liquid phase parallel reactions:R, rR = K?.CA2; E? = 80 KJ/moleS, rS = K?.CA ; E? = 120 KJ/mole The desired product is R. A higher selectivity of R will be achieved, if the reaction is conducted at

Low temperature in a PFR
High temperature in a PFR
Low temperature in a CSTR
High temperature in a CSTR

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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 and θ are always equal
τ = θ , for a non-isothermal reactor

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