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     

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。     

新型气相法全密度聚乙烯高效催化剂

本新型络合载体型气相法全密度聚乙烯高效催化剂制备过程中无需预聚合，具有活性高（５０００～１００００ｇＰＥ／ｇ ｃａｔ）、氢调敏感、共聚能力强等优点；流动性好，初活性适中，粒子形态也好，因而适合在我国引进的大下基层气相法流化床装置上使用。     

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。     

气相法聚乙烯催化剂研究现状及进展

我国在化工生产过程中最常使用的化学产品是气相聚乙烯产品,气相法是目前最常使用的聚乙烯生产方法之一,分析和研究了气相法聚乙烯催化剂,促进化工行业的生产效率。     

气相法全密度聚乙烯高效催化剂的研究

主要讲述了一种结构式为[(MgBuCl)_p,(MgCl(?))](?)[Ti(OBu)xCl_y]_b(THF)_c[(C_eH_(?)_2AlCl]_d的齐格勒-纳塔型催化剂的制备方法.该催化剂具有活性高、共聚能力强、氢调敏感的特性,并且在气相聚合反应过程中放热均匀、操作稳定,适合在我国引进的大型气相流化床工艺装置上使用.     

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...     

气相法全密度聚乙烯高效催化剂的研究

本文从探讨乙烯在钛系催化剂上聚合的机理出发,进行钛系催化剂组份的筛选及活化剂的选择。从而得到聚合效率高、氢调敏感、共聚性能好、适合于乙烯气相聚合工艺的催化剂。催化剂聚合效率:乙烯均聚为35×10~4g·PE/g·Ti,乙烯—1-丁烯共聚时达50×10~4g·PF/g·Ti(操作压力为0.83MPa)。树脂熔体指数0～0.6可调,产品密度0.915～0.97g/cm~3可调。     

气相法聚乙烯催化剂国产化进展与思考

介绍了5种适用于Unipol气相法聚乙烯工艺的国产催化剂的制备技术路线及其在装置上的应用情况,提出了今后开发Unipol气相法聚乙烯催化剂的建议。     

新型高性能Ziegler-Natta催化剂用于乙烯淤浆聚合

A novel high performance MgCl2/TiCl4 catalyst with tetrabutyloxsilicane as electron donor was prepared for ethylene slurry polymerization process. The properties of the catalyst such as particle size distribution, catalytic activity, hydrogen responsibility and copolymerization performance were investigated and compared with commercial catalyst (imported catalyst). Copolymerization of ethylene and 1-butylene using the catalyst was stud-ied in a pilot plant. The composition, structure and property of the copolymer were characterized by 13C nuclear magnetic resonance (13C NMR) and gel permeation chromatography-Infrared (GPC-IR), and compared with those of the copolymer obtained from a commercial catalyst. In comparison with the commercial catalyst, the novel cata-lyst had a higher activity (up to 34.6 kg•g－1) and a better particle size distribution (PSD), and produced polymers having higher bulk density (up to 0.37 g•cm－3) with less fine resin. Meanwhile, the novel catalyst showed a higher hydrogen responsibility and better copolymerization performance. The results indicated that the copolymer obtained from the novel catalyst has a higher branch in the high molecular weight fraction and lower branch in the low mo-lecular weight fraction.     

气相法铬系聚乙烯催化剂QCP-01的改进

从催化剂配方和制备工艺条件方面对QCP-01气相法铬系聚乙烯催化剂进行了改进,达到了适当降低催化剂聚合活性并提高聚合物熔融指数的目的。     

烯烃气相聚合反应器技术专利新进展

综述了国内外在优化分布板和导流设备、调节反应器内静电量、在线监测流化床的温度和高度等状态参数方面的专利进展。指出需要增强分布板中心区域的气速，改善冷凝液的进料位置，提高在线监测的准确度。     

铬系乙烯聚合催化剂研究进展

介绍了铬系乙烯聚合催化剂的类型、改性与发展。指出需对该类型催化剂的聚合反应机理作进一步研究。     

Late Transition Metal Catalyst Based on Cobalt for Polymerization of Ethylene

The late transition metal catalyst of [2,6-diacethylpyridinebis(2,6-diisopropylphenylimine)]cobalt(II) dichloride was prepared under controlled conditions and used for polymerization of ethylene. Methylaluminoxane (MAO) and triisobuthylaluminum (TIBA) were used as a cocatalyst and a scavenger, respectively. The highest activity of the catalyst was obtained at about 30°C; the activity decreased with increasing temperature. At polymerization temperatures higher than 50°C not only was a sharp decrease in the activity observed but also low molecular weight polyethylene product that was oily in appearance was obtained. The polymerization activity increased with increasing both of the monomer pressure and [MAO]:[Co] ratio. However, fouling of the reactor was strongly increased with increasing both of the monomer pressure and the amount of MAO used for the homogeneous polymerization. Hydrogen was used as the chain transfer. The activity of the catalyst and the viscosity average molecular weight (M_v) of the polymer obtained were not sensitive to hydrogen concentration. However, the viscosity average molecular weight of the polymer decreased with the monomer pressure. The (M_v), the melting point, and the crystallinity of the resulting polymer at the monomer pressure of 1 bar and polymerization temperature of 20°C were 1.2 × 10⁵, 133°C, and 67%, respectively. Heterogeneous polymerization of ethylene using the catalyst and the MAO/SiO₂ improved morphology of the resulting polymer; however, the activity of the catalyst was also decreased. Fouling of the reactor was eliminated using the supported catalyst system.     

Effects of Catalyst Activity Profiles on the Operating Conditions of an Industrial Polymerization Reactor

The aim of this paper is to analyze how different catalyst activity profiles influence the operating strategies of industrial polymerization reactors. Since the catalyst activity profiles may change considerably in the range of the residence-time of the reactor, the properties of the produced polymer powder are the averages of ones produced by catalyst particles with various activities. Hence, the residence-time distribution of the polymer phase has an effect on the product properties as well. Based on these phenomena a new method is proposed to transform information from laboratory reactor into a form which can be used to estimate the operation condition of industrial reactor. The whole approach is demonstrated in case of the production of high-density polyethylene.     

α-二亚胺镍溴化物/凹凸棒黏土负载催化剂催化乙烯聚合研究

A nickel-diimine catalyst [N, N'-bis(2,6-diisopropylphenyl)-1,4-diaza-2,3-dimethyl-1, 3-butadiene nickel dibromide, DMN] was supported on palygorskite clay for ethylene slurry polymerization. The effect of supporting methods on the catalyst impregnation was studied and compared. Pretreatment of the support with methylalumi-noxane (MAO) followed by DMN impregnation gave higher catalyst loading and catalytic activity than the direct impregnation of DMN. Catalyst activity as high as 5.42×105g PE·molNi-1·h-1 was achieved at ethylene pressure of 6.87×105 Pa and polymerization temperature of 20℃. In particular, the morphological change of the support during MAO treatment was characterized and analyzed. It was found that nano-fiber clusters formed during the support pretreatment, which increased the surface area of the support and favored the impregnation of the catalyst. The investigation of polymerization behavior of supported catalyst revealed that the polymerization rate could be kept at a relatively h     

CW型高效烯烃聚合催化剂

介绍了CW型催化剂的制备过程、物理及化学变化，还就CW型催化剂用于丙烯聚合的反应动力学、反应活性中心的测量方法进行了论述。     

气相法聚乙烯冷凝态技术应用

介绍了冷凝态和超冷凝态技术在气相法聚乙烯生产工艺方面的应用和发展。     

茂金属催化剂用于乙烯聚合的研究和开发

在研究开发适合于浆液法聚乙烯生产工艺的茂金属催化剂的实验研究中，深入研究了桥链和非桥链，不同中心金属和茂环引入取代基等催化剂对乙烯聚合的影响。