Determination of kinetic parameters for ethylene polymerization (with and without hydrogen) by Ziegler-Natta catalyst.

سال انتشار: 1399
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 304

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شناسه ملی سند علمی:

JR_POJ-7-2_006

تاریخ نمایه سازی: 15 مرداد 1399

چکیده مقاله:

In this study, slurry polymerization kinetics of ethylene with TiCl4/Mg(OEt)2/AlR3 Ziegler-Natta catalysts in various conditions using the model of sum square error (SSE) (method I) and model of least square error (LSE) (Method II) was investigated. For this purpose the molecular weight distributions of the samples were deconvoluted to the minimum number of Flory type distributions where each represents a different active center type of Ziegler-Natta catalyst. The first method used to determine the leading apparent polymerization kinetic constants for each site in absence of hydrogen by simultaneously fitting the instantaneous polymerization rate, cumulative polymer yield, and molecular weight distribution measured for various samples with various conditions. Second method was used to determine all kinetics parameters such as initiation, propagation, termination and transfer to monomer reaction in absence and also in the presence of hydrogen. For the later, transfer to hydrogen also determined. The results showed that this simulation package is a powerful tool for design and scale up this kind of processes.

کلیدواژه ها:

Ethylene polymerization ، kinetic parameters ، model of sum square error ، model of least square error ، method of moments

نویسندگان

Seyed Mehdi Ghafelebashi Zaranda

Polymer Research Group, National Petrochemical Research and Technology Company, Tehran, ۱۴۹۷۷۱۳۱۱۵, Iran

Ali Safinejad

Polymer Research Group, National Petrochemical Research and Technology Company, Tehran, ۱۴۹۷۷۱۳۱۱۵, Iran

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