Majid Ghiass - Iran Polymer and Petrochemical Institute (IPPI).
Mostafa M Nasseri - Iran University of Science and Technology, IUST, Tehran, Iran.
Mansoor Shirvani - Iran University of Science and Technology, IUST, Tehran, Iran.
Hamid Abdollahi - National Iranian South Oil Company (NISOC).

Control of batch polymerization reactor has been a complex and interesting issue in the polymer production plants. The nonlinear nature of the polymerization kinetics and the effectsof operational variables such as temperature on the quality of the final polymer application, make the control of thepolymerization a critical issue which requires a precise procedure. The fractional order controllers have been recently applied for the optimum control of the nonlinear systems suchas batch polymerization reactor. In this work we analysis the temperature control of a batch methyl methacrylate polymerization reactor and tracking performance along the optimal temperature trajectory was investigated