Chemical Reaction Engineering
A typical example of an exothermic reversible reaction conducted at high pressure in industry is

Dehydration of ethanol
Polymerisation of ethylene
Reformation of methane
Methanol synthesis

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

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Chemical Reaction Engineering
"A spherical porous catalyst particle of radius R is subjected to reactant A which reacts to form B by a zero order surface reaction A → B. Film mass transfer resistance is negligible and pore diffusion of A is rate controlling. The effectiveness factor of the catalyst is reported as 7/8. Which of the following statement is true?A. Inner catalyst core of radius R/8 does not participate in reaction."

Inner catalyst core of radius 7R/8 does not participate in reaction
Inner catalyst core of radius R/2 does not participate in reaction
Inner catalyst core of radius R/8 does not participate in reaction
Ffectiveness factor for a zero order reaction can not be 7/8 as it must always be 1

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