Virtual Labs

Reaction kinetic studies in a plug flow reactor

For a plug flow reactor ?

a: axial diffusivity is infinite, radial diffusivity is zero Explanation

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b: axial diffusivity is zero, radial diffusivity is zero Explanation

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c: axial diffusivity is zero, radial diffusivity is infinite Explanation

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d: axial diffusivity is infinite, radial diffusivity is infinite Explanation

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A “space time” of 5 minutes means?

a: 100% conversion of the reactant is achieved in 5 minutes Explanation

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b: One reactor volume of feed at specified conditions is processed in 5 minutes Explanation

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c: 5% conversion is achieved in one minute Explanation

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d: None of the above Explanation

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For a tubular reactor with space time τ and residence time τ, the following statement holds

a: τ and θ always equal Explanation

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b: τ = θ when the fluid density changes in the reactor Explanation

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c: τ = θ for a non-isothermal reactor Explanation

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d: τ = θ for an isothermal tubular reactor in which the density of the process fluid is constant Explanation

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A homogeneous zero-order reaction is conducted in a PFR at 1000C and a reactor volume of V lit is required for realizing a specified conversion. If the same reaction is conducted at1100C, what will be the required reactor volume for the same conversion level as above under otherwise uniform conditions? The activation energy of the reaction is 84 KJ/mole.

a: V/2 lit Explanation

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b: V lit Explanation

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c: V/4 lit Explanation

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d: V/6 lit Explanation

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At present a zero order reaction is being conducted in a PFR of volume V and a fractional conversion of 0.50 is realized. If a 2nd PF reactor of volume V is now added to the first reactor, the reactant concentration in the fluid exiting the battery of two PFRs will be

a: 25% of the reactant concentration in the fluid entering the first reactor Explanation

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b: zero Explanation

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c: 50% of the reactant concentration in the fluid entering the second reactor Explanation

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d: either zero or 25% of the reactant concentration in the fluid entering the first reactor Explanation

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