Continuous Stirred-Tank Reactor That Loses Cooling

The exothermic reaction takes place in a continuous stirred-tank reactor (CSTR) with a cooling jacket. The reactor runs at steady state when the cooling fails at six minutes. After a few minutes, the chemical engineer notices that the reactor temperature is increasing because of the cooling failure. In order to prevent the reactor temperature from getting too high, should the engineer increase or decrease the feed flow rate? What happens to the conversion when the feed flow rate is changed? The time at which the flow rate is changed is also adjustable. The dashed line represents what happens if the flow rate is not changed. The solid blue line represents the behavior if the flow rate is essentially instantaneously changed to a new value.


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Operating at Steady-State
steady-state rate law ()
steady-state rate constant ()
pre-exponential factor ()
concentration of at steady state ()
ideal gas constant ()
activation energy ()
molar flow rate at inlet ()
inlet concentration of ()
moles of at inlet ()
volume of reactor ()
steady-state temperature ()
molar heat capacity of ()
temperature at inlet ()
temperature of coolant, constant ()
heat transfer coefficient times heat transfer area ()
heat of reaction ()

Operation After Cooling Fails
volumetric flow rate is until valve is adjusted, then it is equal to ()
volumetric flow rate of feed after an attempt is made to control the reactor temperature after cooling fails ()
rate of reaction ()
rate constant ()
concentration of , changes with time ()
temperature inside reactor, changes with time ()
concentration of at time cooling fails ()
concentration of at time cooling fails ()
molar heat capacity of ()
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