Optimization reactor feed impurities

Now there are two variables in the optimization. These are the reactor conversion (as before) but now also the concentration of IMPURITY in the recycle. For each setting of the IMPURITY concentration in the recycle, a set of trade-offs can be produced analogous to those shown in Figures 13.17 and 13.18. Figure 13.19 shows the tradeoffs for the feed impurity case and a purge with fixed concentration of impurity in the recycle1213. 

Reactor effluents are almost never products that meet purity specifications. Besides the products, effluents may contain reactants, inerts, products of undesired side reactions, and feed impurities. Thus, almost every chemical process that involves a chemical reaction section also involves one or more separation sections in addition to one or more recycle streams. A major challenge of process design is to devise an optimal scheme for uniting the reaction and separation functions of a process. This chapter presents many of the considerations involved in that optimization. Although Figure 7.1 shows only one reactor section, multiple reactor sections are sometimes required, with separation sections located between each pair of reactor sections... 

---