As we study chemical engineering and in process engineering, we come across the importance of a Continuous Stirred Tank Reactor, CSTR. Many types of controllers have been applied on the CSTR process to control the reactor temperature. In this research paper, an analysis of the response of the conventional Proportional-Integral-Derivative, PID controller and multi types of Fuzzy Logic controller for temperature control of CSTR and to design a control system of a non-isothermal temperature control of a CSTR in order to produce the most theoretically stable response curve. A mathematical model of a CSTR using the most general operating condition was developed through a set of differential equations which were later then converted into S-function using MATLAB (Matrix Laboratory) editor. After developing the S-function of the defined CSTR model was used in SIMULINK (a graphical programming environment from MATLAB), model by using a path called User-Defined functions which allows us to apply a M.file system that was created prior to the simulation as for this project we used a system block of the S-function or S-function builder
