Reactor R$-2$ is a batch polymerization reactor making Nylon$66($see Figure $6-$X$1).$ It is fed adipic

acid and hexamethyldiamine monomers. After reactant charging is complete and the polymer is

partly formed, the reactor is heated further and vacuum is pulled on the headspace to pull off

the water byproduct and drive the polymerization to completion. Analyze the hazards of this

batch process and write interlocks for SV$-$R$2$M$,$ SV$-$R$2$V$,$ and SV$-$R$2$B$.$ SVC indicates a closed

limit switch for each valve, which are feedback signals you may use in your interlocks $($all are fail

closed valves$).$ Justify your answers.

Figure $6-$X$1$: Nylon$66$ Reactor