A New Method for Dissolving MgCl2 for Preparation of Ziegler-Natta Propylene Polymerization Catalyst

来源 :中国炼油与石油化工(英文版) | 被引量 : 0次 | 上传用户:yq_ma
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
A new method for the activation of crystalline magnesium chloride by polyethylene glycol was described.Polyethylene glycol could solubilize crystalline magnesium chloride.The resulting solution was used for the preparation of Ziegler-Natta propylene polymerization catalysts.These catalysts are highly active and stereospecific.The relationship between the catalytic activity and the Al/Ti ratio was studied in detail.
其他文献
A Fricke-PVA-xylenol orange (FPX) hydrogel dosimeter, in good transparency, was prepared by physical crosslinking for three-dimensional dose measurements. The p
本文以铁门代水库除险加固工程中应用虹吸式放水涵管为例,对施工中重点作出了分析,希望能为同类工程坝下涵管改造提供成功的经验。
针对多部件系统固定维修时间长的特点,提出采用机会维修策略,将预防性维修和故障维修有机结合起来,从而分摊系统的固定维修时间,实现提高系统可用度的目的.为此,分析了系统的
The molecular structures, electron affinities, vibrational frequencies and IR intensities of the SF5OX/SF5OX- (X=F, Cl, Br) species have been determined by four
Six N-alkyl-4′-methyl-1,1′-biphenyl-2-sulfonamides were synthesized facilely and efficiently from low cost and readily available benzenesulfonyl chloride and
Based on the feasibility of isothermal superplastic solid state bonding of 40Cr and Cr12MoV steels, the surfaces of both steels to be bonded were ultra-fined th
An improved cluster thermal time constant (CTTC) and surface thermal time constant (STTC) numerical model was introduced,which took into account the effect of v
When the decrease in the space between magnetic head and disk arrived at 10 nm or less, which is much lower than the mean free path of gas molecules, the gas fl
Objective To prepare artificial antigens and anti-citrinin egg yolk-derived immunoglobulin (IgY) to build an enzyme-linked immunosorbent assay (ELISA) for citri
Jute fibre properties, viz. linear density, mechanical properties, and fibre staple length were analyzed in this paper. Morphology, lignin content, and composit