申論題

4. A liquid phase reaction A → R + S takes place in a system consisting of a CSTR and a plug flow reactor (PFR) with recycle. One introduces 2 kmol/m³ of reagent A into the first reactor (CSTR). Both CSTR and PFR operate isothermally at 400oC and atmospheric pressure. The volume of the first reactor is 0.086 m³ and the inlet flow is 3.2 m³/ks. The conversion at the outlet of the PFR is 90%. It is a first-order reaction and the reaction rate is (-rA) = 8 CA kmol/(m³.h). Calculate the PFR volume considering a recycle ratio of R = 1. (20%)