Kinetic study on liquid propylene polymerization using a modified heat flow reaction calorimeter
محل انتشار: فصلنامه پلی اولفین ها، دوره: 8، شماره: 2
سال انتشار: 1400
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 242
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شناسه ملی سند علمی:
JR_POJ-8-2_007
تاریخ نمایه سازی: 21 تیر 1400
چکیده مقاله:
Bulk phase polymerization of propylene with a ۴th generation of Ziegler-Natta catalyst was kinetically investigated by means of heat flow calorimetry. The assumptions and modifications on isothermal calorimetric method were demonstrated. Our calibration method showed that heat exchange with the reactor cover plate is not constant over time. Therefore, the dynamic of cover plate temperature was considered in the calorimetric method. The polymerization rate profiles depending on hydrogen and external electron donor concentration have been investigated. Normalized polymerization profiles (Rp /Rpmax) are plotted and expressed as an exponential function of time. Effects of hydrogen and external electron donor (ED) concentration on Rpmax and polymerization rate were investigated as well. The results showed that by increasing hydrogen concentration, initial polymerization rate (Rpmax) increased. Hydrogen increased productivity by increasing the initial polymerization rate, while it had no negative effect on the rates of decay or its effect was small. The ED concentration was optimized so that the catalyst deactivation rate was at its lowest level. Also, changes in the ratio of activation to inactivation with ED concentration were examined, and a proportional change was observed.
کلیدواژه ها:
نویسندگان
Mehrsa Emami
Department of Process and Modeling, Iran Polymer and Petrochemical Institute, P.O. Box ۱۴۱۸۵/۴۵۸, Tehran, Iran
Farzin Hormozi
Department of Process and Modeling, Iran Polymer and Petrochemical Institute, P.O. Box ۱۴۱۸۵/۴۵۸, Tehran, Iran
Hossein Abedini
Department of Process and Modeling, Iran Polymer and Petrochemical Institute, P.O. Box ۱۴۱۸۵/۴۵۸, Tehran, Iran
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