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聚合条件对有机载体钛系催化剂催化乙烯聚合的影响

Effect of Polymerization Conditions on Ethylene Polymerization Catalyzed by Organic Supported Titanium Catalyst
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摘要 文章研究了有机载体钛系催化剂对乙烯聚合性能的影响,考察了铝钛摩尔比、聚合温度、氢气分压、乙烯压力和反应时间对有机载体钛系催化剂催化乙烯聚合活性和产物颗粒形态的影响。结果表明,在三乙基铝为助催化剂、n(Al)/n(Ti)=125、1.1 MPa、70℃、2 h的条件下,该催化剂具有较高的活性,活性为28300 g/gCat,聚合物堆积密度为0.326 g/cm^(3);随着氢气分压提高,催化剂活性下降,聚合物的堆积密度和分子量降低,聚合物的颗粒粒径变小,细粉含量增多;反应体系中乙烯压力提高有利于催化剂活性和聚合物堆积密度提高;延长反应时间可以增加催化剂活性,但其活性增加较为缓慢。 The effect of organic supported titanium catalyst on the performance of ethylene polymerization was studied.The study investigated the effects of molar ratio of Al to TI,polymerization temperature,hydrogen partial pressure,ethylene pressure and reaction time on the catalytic activity and particle morphology of polyethylene.The results indicate that the catalyst has high activity,the activity is 28300 g/gCat,and the bulk density of polymer is 0.326 g/cm^(3)under optimal conditions,i.e.triethylaluminum as cocatalyst,mole ratio of Al to Ti 125,total pressure 1.1 MPa,polymerization temperature 70℃,and time 2 h.With the increase of H 2 partial pressure,the activity of catalyst decreases,the bulk density and molecular weight of polymer decrease,the particle size of polymer decrease,and the content of fine powder increases.The increase of ethylene pressure in the reaction system is beneficial to the increase of catalyst activity and the bulk density of polymer,and the activity of the catalyst can be increased by prolonging the reaction time,but the increase of activity is relatively slow.
作者 任合刚 高晶杰 姚棋 李广环 REN Hegang;GAO Jingjie;YAO Qi;LI Guanghuan(School of Material Science and Engineering,Guangdong University of Petrochemical Technology,Maoming 525000,China)
出处 《广东石油化工学院学报》 2023年第4期43-47,57,共6页 Journal of Guangdong University of Petrochemical Technology
基金 广东石油化工学院人才引进项目(2019rc036)。
关键词 有机载体 ZIEGLER-NATTA催化剂 乙烯聚合 organic carrier Ziegler-Natta catalyst ethylene polymerization
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