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Influence of alkylaluminium on TiClx/ MgCl2/ THF catalyst——Effect of Al-alkyl on chemical structure and catalyst performance

HUANG Wenqing1,2,YANG Ling2,ZHAO Xi2,MAN Yi2,LI Bingyi2,ZHANG Ying2,YANG Wantai1   

  1. 1 College of Material Science and Technology,Beijing University of Chemical Technology,Beijing 100029,China;2 Beijing Research Institute of Chemical Industry,SINOPEC,Beijing 100013,China
  • Online:2011-06-05 Published:2011-06-05

烷基铝对TiClx/MgCl2/THF催化剂化学结构及性能的影响

黄文氢1,2,杨 岭2,赵 曦2,满 毅2,李秉毅2,张 颖2,杨万泰1   

  1. 1北京化工大学材料科学与工程学院,北京100029;2中国石油化工股份有限公司北京化工研究院,北京100013

Abstract:

In this articlecatalysts treated with various Al-alkyl groups in the catalytic system TiClx/MgCl2/THF were prepared and their chemical structures were characterized by XPS and EPR. The influences of Al-alkyl on catalyst chemical structureespecially on titanium valence were discussed. The analytical results indicated that Al-alkyl affected Ti structure of the catalysts. In additionchemical structures of catalysts were found to changed obviously by the pre-treatment process. These structure changes were found to be related to the performance of ethylene homo-polymerization. The results of evaluation experiments showed that catalytic activity was improved from 4890 gPE/gcat to 9300 g PE/gcat after Al-alkyl pre-treatment on a lab scale and from 8400 gPE/gcat to 11000 g PE/gcat on a pilot plant scale.

摘要:

研究了一系列不同烷基铝处理的TiClx/MgCl2/THF体系Ziegler-Natta催化剂,并采用XPSEPR对其化学结构进行表征,初步探讨了烷基铝变化对催化剂化学结构的影响,特别是对Ti价态的影响。研究结果表明,由于烷基铝的作用,催化剂中活性组分Ti的结构发生了明显的改变,而其中烷基铝预还原过程对催化剂的结构影响较大。借助催化剂的这些结构上的变化引起其催化性能的显著提高,对比评价结果表明,小试催化剂的乙烯均聚活性从预还原前的4890 gPE/gcat提高到9300 g PE/gcat,工业生产催化剂从8400 g PE/gcat提高到11000 g PE/gcat

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