内给电子体在气相聚乙烯催化剂中作用的研究
Chemical Engineer(2010)
Abstract
采用浸渍法制备工艺,在MgCl2/SiO2复合载体齐格勒-纳塔(Z-N)催化剂制备过程中加入了醇、酯、醚和硅烷四类内给电子体,考察了不同内给电子体对气相聚乙烯催化剂的活性、产物堆密度、细粉含量的影响;结果表明:正硅酸乙酯作为聚乙烯催化剂的内给电子体效果较好,催化剂活性达到3447.5g·PE/g·Cat·h,聚合物堆密度达到0.33g·cm-3,细粉含量仅占0.052%,电子显微镜下催化剂颗粒呈均匀的球形。
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Key words
tetraethoxy-silicone,internal electron donor,gas phase polyethylene,catalystcertifying
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