浆液法高效催化剂的乙烯聚合行为

考察了浆液法聚乙烯高效催化剂在总压0．7MPa、氢气分压0．18MPa下的乙烯聚合行为，表明催化剂活性中心失活符合一级规律，Al/Ti的影响可用Langmiur-Hinshelwood吸附竞争模型来描述；温度在70－90℃条件下，利用Arrhenius方程计算出了催化剂聚合反应的表现活化能为0．11kJ/mol。     

新型TH-1L浆液状聚合催化剂的中试评价

在中试聚乙烯装置上分别应用TH-1L浆液催化剂和固体M-1催化剂通过聚合反应,生产DFDA7042产品,对产品进行性能对比,以评价两种催化剂的性能。结果表明,TH-1L催化剂具有较高的聚合活性,活性可达61400 kg-PE·(kg-cat)^－1左右。     

负载茂金属催化剂催化乙烯气相聚合

研究了负载茂金属催化剂(n-BuNeCp)_2ZrCl_2/SiO_2的乙烯气相聚合行为及其催化聚合产品的性能。三乙基铝加入聚合体系后可降低负载茂金属催化剂的初始活性,有利于聚合过程中的温度控制。气相聚合产品聚乙烯的重均分子量为(1 42～2.28)×10~5,相对分子质量分布为2.6～3.1,熔点在135℃以上,结晶度约为60%,聚乙烯产物颗粒形态以球形为主.堆密度大于0.35 g/cm~3。     

新型高效催化剂气相聚合制备聚乙烯

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     

国产气相法聚乙烯催化剂QCP—01的中试聚合评价

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。     

气相法乙烯聚合铬系催化剂的性能研究

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。     

气相法聚乙烯高效催化剂的进展

综述了国内外气相法聚乙烯高效催化剂研究进展概况,以及各种新型高效催化剂制备技术和性能,并对开发我国新型高效推化剂提出了看法。     

NT-1型PE高效催化剂及其催化乙烯聚合

采用扫描电子显微镜与X光衍射仪分析了NT-1型催化剂工业化产品的形态结构,讨论了催化剂的浓度、聚合温度、氢气压力、共聚单体浓度对催化剂聚合性能的影响.结果表明:NT-1型催化剂不但具有独特的物相结构,而且催化聚合性能优良.     

铬/钒双金属催化剂催化乙烯气相聚合

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。     

高性能气相聚乙烯催化剂的研究

采用浸渍法制备了气相法聚乙烯倦化剂.研究了组成、粒径分布、微观形态、载钛时间和TiCl4加入量对倦化剂性能的影响.结果表明:该催化剂具有与商用催化剂相似的组成,粒径分布窄,颗粒形态良好；通过选择高比表面积的硅胶载体、提高催化剂有效组分的负载量和适当延长载钛时间可提高催化剂效率;当硅胶比表面积为312 m2/g,负载时间...     

改进的催化剂的乙烯聚合动力学研究

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.     

气相法聚乙烯BCG-Ⅱ型催化剂的开发和应用

对气相法聚乙烯BCG-Ⅱ型催化剂的组成、粒径分布及催化剂的淤浆聚合性能进行了研究。研究结果表明，BCG—Ⅱ型催化剂的活性较高，聚合物堆密度适中，应用在Unipol乙烯气相聚合工艺装置上操作良好，所生产的树脂颗粒均匀。干爽且流动性好，产品质量合格、稳定。     

卤代烃对乙烯气相聚合催化剂性能的影响

在淤浆聚合反应器中考察了二氯甲烷、三氯甲烷、四氯化碳、1,2-二氯乙烷、1,1,1-三氯乙烷、1,1,2-三氯乙烷、1,1,2,2-四氯乙烷、六氯乙烷和1,1,2-三氯三氟乙烷9种卤代烃促进剂对乙烯气相聚合催化剂催化活性的影响。结果表明,卤代烃促进剂的加入可有效提高催化剂活性,促进剂的最佳加入量与卤代烃的数量、种类、卤代位置以及烷烃的类型有关。     

Homogeneous polymerization of ethylene using an iron‐based metal catalyst system

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     

气相聚乙烯BCG催化剂的工业应用

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。     

亚乙基苊镍催化剂催化乙烯溶液聚合制备超支化聚乙烯

以一种亚乙基苊(α-二亚胺)镍配合物为主催化剂,研究了温度、压力、助催化剂及其用量等对乙烯溶液聚合制备超支化聚乙烯(HBPE)的影响,并对HBPE的结构与性能进行分析.结果表明:随着温度或压力的升高,催化剂活性均呈现先升高后下降的趋势;HBPE的相对分子质量随温度的升高而下降,而支化度与温度呈正比,与压力呈反比;二氯乙...