Question

# A liquid phase reaction occurs at 363K in a continuous stirred tank reactor (CSTR). The reaction is a single species second order decay, i.e. A \rightarrow P \quad-r_{A}=k[A]^{2} The rate

constant at the reaction temperature is 0.035 L mol1 min', the concentration of reagent is 6 mol L1, the flow to the reactor is 5 m3 hr1, and the volume of the reactor is 400 L. a) What is the design performance equation for this reactor? b) What will be the output concentration from the reactor? c)) What willI be the conversion? The conversion in the CSTR is deemed to be too low and there are no capital funds available to buy a bigger one. The plant engineer suggests that the standby pump for the CSTR could be utilized to create a plug flow reactor (PFR), as these are relatively cheap to build. After scouring the yard, the engineer finds a series of abandoned pipes and bolts them together to act as the PFR. He calculates the total volume of the pipe to be 1000 L. If the outlet from the CSTR is now routed to the new PFR, i.e. the CSTR and PFR now run in series: d) What is the design performance equation for the PFR reactor? e) What will be the output concentration from the PFR reactor? f) What will be the conversion in the PFR and the total conversion of the process? g) The conversion is still too low, how much more volume does the PFR need to achieve an overall conversion of 0.95? h) Draw a process and instrumentation diagram (P&ID) for the production system and include all items/components you would deem necessary to operate as a reliable and robust process.

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