共查询到17条相似文献,搜索用时 78 毫秒
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新型高效催化剂气相聚合制备聚乙烯 总被引:5,自引:0,他引:5
综合报道了新型乙烯气相聚合MG型催化剂的制备及其聚合反应性能。研究了采用浸渍反应法制备含TiCl4/MgCl2/ZnCl2/SiO2醇/Al(i-Bu)3的MG-4型高效催化剂。在压力1.0MPa下,乙烯聚合催化效率高达445 ̄884kgPE/gTi,制得了表观密度≥g/0.37/cm^3、重均颗粒分布(20 ̄200目)≥97.7%、颗粒状态良好的聚乙烯。用DSC、SEM、WAXD对聚合产物进行了 相似文献
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聚乙烯新型催化剂QCP-01在气相法聚乙烯中试装置上进行聚合评价试验,通过对催化剂的活性,熔体流动速率对操作条件的敏感性,催化剂的共聚性能,运行稳定性及产品性能的分析,对QCP-01催化剂作出了较全面的评价,并提出了该催化剂的改进方向。 相似文献
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气相法乙烯聚合铬系催化剂的性能研究 总被引:1,自引:0,他引:1
在小试及中试实验中,将QCP-01气相法铬系聚乙烯催化剂与工业G催化剂进行聚合活性及产物性能的对比,结果表明,改进后的QCP-01催化剂的催化均聚活性、共聚性能及聚合产物的主要性能均与G催化剂相当。 相似文献
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在实验室小试气相聚合釜中对铬/钒双金属催化剂进行乙烯聚合评价,考察了不同聚合温度和压力时催化剂的性能,研究了不同条件下催化剂的动力学行为,并将其聚合动力学曲线与用工业铬系催化剂的进行了比较。结果表明:随着聚合温度升高,用铬/钒双金属催化剂制备的聚乙烯的相对分子质量减小,熔体流动速率增大,在所研究聚合温度范围内铬/钒双金属催化剂对温度更敏感;随着聚合压力增大,催化剂活性显著提高,聚乙烯相对分子质量增加;聚合动力学曲线与铬系催化剂不同,聚合反应速率先增大再降低最后逐渐达到平稳。 相似文献
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The study concerns the use of MgCl2-supported high-activity Ziegler-Natta catalysts for the polymerization of ethylene. In particular, two types of catalysts were investigated, which were N-catalyst (BRICI) and improved polyethylene catalyst. The effects of catalyst structure on kinetic behavior were examined. The distribution of active centers in these catalysts was investigated by energy dispersive analysis by X-rays (EDAX), and morphologies of catalyst particles and polymer products were examined by scanning electron microscope (SEM). Hydrogen response and copolymerization performance were investigated and compared with the two catalysts. The results were correlated with the kinetic behavior of the two catalysts and appropriate models for polymer particle growth were presented. The improved polyethylene catalyst showed higher activity, better hydrogen response and copolymerization performance. 相似文献
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Hossein Mahdavi Alireza Badiei Gholam Hossein Zohuri Abbas Rezaee Roghieh Jamjah Saied Ahmadjo 《应用聚合物科学杂志》2007,103(3):1517-1522
An iron‐based catalyst of 2,6‐bis‐[1‐(2‐methylphenylimino)ethyl]pyridine iron dichloride was prepared. The ligand was prepared using 2,6‐diacetylpyridine as the starting chemical under controlled conditions. The preparation procedure was followed using 13C‐NMR, 1H‐NMR, FT‐IR, MS (mass spectroscopy), and elemental analysis methods. The homogeneous polymerization of ethylene was carried out using the prepared catalyst in toluene media. Methyl aluminoxane (MAO) was used as a cocatalyst. The effect of the [Al] : [Fe] molar ratio, polymerization temperature, and monomer pressure of 202,000 to 454,500 Pa on the polymerization behavior were studied. The highest activity of the catalyst was obtained at 30°C, the activity decreased with increasing temperature, while increasing pressure linearly increased its activity. The molecular weight distribution of the polyethylene obtained was 1.25 to 1.72. A weight average molecular weight of 7.1 × 104 and 1.5 × 103 were obtained. The crystallinity of the polymer was about 19% and its melting point was about 65°C. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 103: 1517–1522, 2007 相似文献
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气相聚乙烯BCG催化剂的工业应用 总被引:3,自引:0,他引:3
介绍了BCG催化剂在Unipol气相法聚乙烯装置上的工业应用。工业试用表明,BCG催化剂的流动性能、氢调和共聚合性能良好,活性较高,综合性能优良;树脂性能测试表明,用BCG催化剂生产的薄膜级线型低密度聚乙烯树脂的加工性能良好,产品物理、机械性能达到优级品标准。 相似文献