UDC 621.3 CONTROL METHODOLOGIES FOR CONTINUOUS STIRRED TANK REACTOR (CSTR) — A BRIEF REVIEW © Nalini Singh, Graphic Era Hill University, Dehradun, India Parvesh Saini, Graphic Era Hill University, Dehradun, India Rajesh Kumar, Graphic Era Hill University, Dehradun, India Abstract. <...> Generally all the chemical process industries involve a huge number of major reactions taking place which are either exothermic or endothermic in nature. <...> These reactions are performed in different units of chemical process industries which include: distillation columns, evaporators, heat exchangers, chemical reactors, etc. <...> Chemical reactors are the most important unit of any chemical industry. <...> Continuous Stirred Tank Reactors (CSTRs) are the most common chemical reactors used for the continuous mixing of reactants entering freely into it. <...> CSTRs are the highly dynamic and nonlinear units with wide operating ranges. <...> The reactants at particular concentration and temperature are entered in CSTR. <...> So, concentration of product and temperature are two important parameters of CSTR which are to be controlled, while operating CSTR at steady state. <...> In the jacketed CSTR the temperature is maintained by removing heat in the reactor in case of exothermic chemical reaction. <...> A lot of different methodologies have been proposed by researchers for the parameters of concern in CSTR. <...> So, this paper presents a brief review of some of the control techniques and systems proposed for CSTR for temperature control. <...> INTRODUCTION CSTRs have been the most largely studied units of chemical process industries for their dynamic and control analysis. <...> CSTRs are used to mix the reactants at constant temperature and produce the desired product through chemical reaction. <...> This leads in the rise in the temperature of the reactor which further results in deterioration of the final product and side reactions which eventually can damage the chemical reactor. <...> However, due to the highly dynamic and nonlinear nature of a CSTR, it is a challenge for process engineers to control the temperature. <...> One of the most well-known methods of maintaining the temperature of CSTR is through proper heat transfer either by once through circulation of the coolant in the jacket around the CSTR or by recirculating the coolant in the jacket. <...> However, the dynamic behaviour of Jacketed CSTRs with recirculating heat transfer system is <...>