A simple methodology to determine the extent of workable regions of disturb
ance variables, i.e., feed temperature, inlet flow rate, and feed concentra
tion, for a certain chemical reactor with a SISO feedback linearizing contr
oller under constraints on control input is presented. In these relatively
wide regions, the feedback linearizing controller is able to stabilize reac
tor temperature at a set point with good performance despite constraints on
the coolant temperature.