In this work, the effects of different process parameters were investigated on the performance of TiCl₄/internal donor/MgCl₂/AlEt₃ catalytic system and produced polyethylene in a semi-batch stirred reactor. Various methods such as Brunauer–Emmett–Teller (BET) surface area analysis, scanning electron microscope (SEM), sieve shaker and melt flow index (MFI) measurement were used to investigate the catalyst activity and final polyethylene product. The results showed that cyclohexylchloride as promotor, in the presence of external donor, increased the catalyst activity up to 110% at optimum ratio to titanium. On the other hand, the polymer particle size and fine particles, which were directly related to the catalyst activity in the most cases, increased up to 15% in the presence of optimal halocarbon/Ti ratio and decreased up to 45% using hydrogen in the studied range. Also, in the optimal ratio, cyclohexylchloride increased the active site concentration and as a result, the MFI increased significantly. Also at low agitator speeds, due to low heat and mass transfer, the catalyst particles were severely fragmented and the particle size was decreased clearly. The results also showed that due to the special catalyst structure, pre-polymerization with propylene increased the catalyst activity by approximately two times compared to ethylene pre-polymerization.

中文翻译：

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不同工艺参数对使用外部给体和环己基氯化物的TiCl 4 /内部给体/ MgCl 2 / AlEt 3催化体系的影响

在这项工作中，研究了不同工艺参数对TiCl ₄ /内部供体/ MgCl ₂ / AlEt _{3性能的影响。}催化体系，并在半间歇搅拌反应器中生产聚乙烯。各种方法，例如Br​​unauer-Emmett-Teller（BET）表面积分析，扫描电子显微镜（SEM），筛筛和熔体流动指数（MFI）测量，均用于研究催化剂活性和最终聚乙烯产品。结果表明，在外给体存在下，环己基氯化物作为促进剂，在与钛的最佳比例下，可将催化剂活性提高至110％。另一方面，在大多数情况下，与最佳催化剂活性直接相关的聚合物粒径和细粒，在存在最佳卤代烃/钛比的情况下增加至15％，而在氢气中使用氢减少至45％。研究范围。同样，在最佳比例下，环己基氯化物增加了活性部位的浓度，因此，小额信贷机构大幅增加。同样在低搅拌器速度下，由于低热量和传质，催化剂颗粒严重破碎并且粒度明显减小。结果还表明，由于特殊的催化剂结构，与丙烯的预聚合相比，与丙烯的预聚合将催化剂活性提高了约两倍。