Dynamic optimization of batch emulsion polymerization of vinyl acetate—an orthogonal polynomial initiator policy

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Abstract

A minimum end time initiator addition policy for batch emulsion polymerization of vinyl acetate under a constant reaction temperature is found using a general nonlinear programming solver and orthogonal collocation techniques. The constraints are restrictions on the reaction rate of the polymerization and the total amount of initiator added. A 5-1 jacketed reactor with a computerized temperature control system was used to carry out several experimental runs. Experimental results show a good agreement with theoretical predictions for this complex system. The results also demonstrate that good temperature control can be achieved for this highly exothermic reaction system under these optimal-control policies. The methodology used to solve this fixed initial value constrained optimal-control problem is a modified version of Biegler (1984, Comput. chem. Engng8, 243). The modified approach is more promising in cases where state constraints and/or free end time situations exist.

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