Question

If weight of all solids in the reactor is 300kg and the feed rate of solids is \(\frac{50kg}{hr},\) then the mean residence time(in hrs) of a material of a given size for mixed flow of a mixture of sizes of unchanging size particles is ____

(a) 7

(b) 6

(c) 4

(d) 3

I had been asked this question during an interview.

The query is from Design of Fluid Particle Reactors topic in division Fluid-Particle Reactions: Kinetics of Chemical Reaction Engineering

Answer 1

The correct choice is (b) 6

To explain: t = \(\frac{W}{F} = \frac{300}{50}\) = 6 hrs.