Problem $1$ Levenspiel Example $12\mathrm{.}2$;

EXAMPLE $12\mathrm{.}2$ CURING A MISBEHAVING REACTOR

At present our $6-m^3$ tank reactor gives $75\%$ conversion for the first order reaction

$AR.$ However, since the reactor is stirred with an underpowered paddle

turbine, we suspect incomplete mixing and poor flow patterns in the vessel. A

pulse tracer shows that this is so and gives the flow model sketched in Fig. E$12\mathrm{.}2.$

What conversion can we expect if we replace the stirrer with one powerful

enough to ensure mixed flow?