a$)$ Consider the exothermic and reversible reaction in liquid phase, of first order in

both directions with $H=-20$kca$\frac{l}{m}ol,$ and $k_1=9{10}^6$exp$(-\frac{15000}{R}T)$

min$-1.$ For $T=303K,K=15.$ The feed stream is pure A$.$ Determine the spatial

time required to convert $60\%$ of $A$ in a PFR$,$ operating at optimum temperature

progression.

b$)$ Determine the spatial time required to convert $60\%$ of $A$ in a MFR$,$ considering

isothermal operation at $303K.$ Comment the result by comparing it with the

obtained in the preceding problem.