Abstract

This paper considers optimization of stationary production and dynamic grade changes for a gas phase polyethylene reactor. The designed cost function considers costs of inflows and revenues from produced polymer. At dynamic optimization, the cost function uses grade variable intervals for defining on-grade polymer and includes economical incentives to produce on-target polymer. Additionally, it also considers a preparatory time interval prior defined transition time, used for economical preparation of reactor state. A previously published model of a gas phase reactor is used and several grade changes are optimized, showing the effects of an economical cost function.

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