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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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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
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新型气相法全密度聚乙烯高效催化剂 总被引:1,自引:0,他引:1
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。 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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气相法全密度聚乙烯高效催化剂的研究 总被引:1,自引:0,他引:1
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. 相似文献
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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。 相似文献
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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。 相似文献
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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 kg8226;g-1) and a better particle size distribution (PSD), and produced polymers having higher bulk density (up to 0.37 g8226;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. 相似文献
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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。 相似文献
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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。 相似文献
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《国际聚合物材料杂志》2012,61(10):776-786
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 (Mv) 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 (Mv), 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. 相似文献
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Sándor Németh Balázs Feil Péter Árva 《Polymer-Plastics Technology and Engineering》2013,52(12):1301-1306
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. 相似文献
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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 总被引:1,自引:0,他引:1
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 相似文献
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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。 相似文献
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茂金属催化剂用于乙烯聚合的研究和开发 总被引:3,自引:0,他引:3
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。 相似文献