| Summary: | 碩士 === 國立臺灣科技大學 === 化學工程系 === 93 === In order to meet the market demand of polymer industry, one polymer usually produces many different final products. In fact, the polymer industry may produces 30-40 kinds of polymer grades, and each of them have different polymer properties for final grades. The aim of this study is not only to simulate the three processes of polypropylene, high density polyethylene and ethylene-vinyl acetate (EVA) copolymerization, but also discuss the advantage and disadvantage of using various grade transition strategies in the system.
In the open literature, we can only get the product properties, but not the exact operating condition. Hence, we use the sensitivity of the variables to product properties for polypropylene and high density polyethylene to find the right operating conditions of these two processes. For EVA system, we already have the operating conditions according to chen(2004). Industrial grade transition strategies are applied to these three systems. We find out that the overshoot strategy has most significant effects during grade transition. The effects of quick venting strategy and bed de-inventorying strategy are not obvious. We further obtain the best overshoot strategy via detailed dynamic simulation.
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