Chemical Reaction Engineering
The reaction A → B is conducted in an adiabatic plug flow reactor (PFR). Pure A at a concentration of 2 kmol/m³ is fed to the reactor at the rate of 0.01 m³ /s and at a temperature of 500 K. If the exit conversion is 20%, then the exit temperature (in k)is (Data: Heat of reaction at 298 K = - 50000 kJ/ kmole of A reacted Heat capacities CPA = CPB = 100kJ/kmole. K (may be assumed to be independent of temperature))

500
600
400
1000

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

Conversion is cent per cent after three hours
It takes three hours to dump the entire volume of the reactor with feed
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

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Chemical Reaction Engineering
In case of staged packed bed reactors carrying out exothermic reaction, use

All of these
Plug flow for dilute liquid requiring no large preheating of feed
High recycle for pure gas
Cold shot operations for a dilute solution requiring large preheating to bring the stream upto the reaction temperature

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