Abstract
The mathematical model of a semi-batch polymerization reactor is derived by considering the basic equations of reaction rate, mass balances and energy balances. Experimental result confirmed the justification of this model. The model still has several unknown parameters. Then the sliding-mode control strategy based on the mixer model is used. It is shown that this control system has good dynamic response and robustness to parameter deviations. Then, it is confirmed in the production reactor that this control strategy shows the effective responses and robustness.