In this work, the performance of classical PID, IMC and SP controllers are compared with an emerging control technique such as fuzzy logic control. For this purpose, the focus of this work has been on the control strategies of a pH neutralization reactor. The latter is a system that presents high nonlinearities. The results indicated that both classical and fuzzy logic controllers c o u l d achieve the objectiveof reaching the desired values, with and without disturbances. However, the difference between the controllers occurs in the settling time, being thus that the fuzzy logic controller presents the fastestand most efficient response. Despite what is indicated by the performance indexes analyzed

pH neutralization reactor, PID control, internal model control, smith predictor control, fuzzy logic control