GATE CH 2022 CH Q62: Chemical Reaction Engineering

Consider the process in the figure. The liquid phase elementary reactions

occur in the continuous stirred tank reactor (CSTR), where

is the mole fraction of the

component (

) in the CSTR. It is given that

. All process feed, process exit and recycle streams are pure. At steady state, the net generation rate of the undesired product,

, in the CSTR is zero.

is varied at constant reactor temperature, the reactor volume is adjusted to maintain a constant single-pass conversion of

. For a fixed product rate and 90% conversion of

in the reactor, the value of

that minimizes the sum of the molar flow rates of the A and S recycle streams is ______ (round off to one decimal place).

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