Chemical Reaction Engineering
A space time of 3 hours for a flow reactor means that

Conversion is cent per cent after three hours
Three reactor volumes of feed can be processed every hour
The time required to process one reactor volume of feed (measured at specified conditions) is 3 hours
It takes three hours to dump the entire volume of the reactor with feed

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Chemical Reaction Engineering
Brunaur, Emmet and Teller (BET) equation is used to determine the specific surface area of a porous particle but not the pore volume & the porosity of the catalyst bed. Which of the following postulates is not used to derive BET equation?

The adsorbed layer may be polymolecular in thickness and the heat of adsorption in each layer (except the first one) is involved in each of the evaporation process
Langmuir
There is no dynamic equilibrium between successive layer
None of these

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