华东理工大学学报（自然科学版）2018，Vol.44Issue(1)：41-46,6.DOI:10.14135/j.cnki.1006-3080.20170306001
茂金属/MAO催化剂催化1-癸烯齐聚动力学
Kinetics of Oligomerization of 1-Decene Catalyzed by Metallocene/MAO Catalyst
摘要
Abstract
1-Decene oligomerization is the most commonly used method for preparing poly-alpha-olefin (PAO).PAO is currently the best synthetic lubricating base oil with low pour point,suitable viscosity with the change of temperature,excellent thermal stability,small evaporation loss and other advantages,which are especially suitable for alpine and frigid regions.Therefore,PAO is now widely used in automotive,aerospace and other industries.There are many catalysts for the oligomerization of 1-decene,among which the metallocene catalyst has good performance and the product has many advantages such as low viscosity and high viscosity index.Methyl aluminoxane (MAO) is commonly used as cocatalyst in metallocene catalysis.The polymerization kinetics are important for optimizing the catalyst system and reactor control.However,few studies on the kinetics of oligomerization of 1-decene catalyzed by metallocene/MAO have been reported at home and abroad.In order to control the performance of lubricant base oil effectively,the study of kinetics is necessary.In this paper,1-decene polymerization was catalyzed by tBuNC(Me)2 (η5-C5H5)ZrCl2/MAO.The kinetic model of diffusion effect was established,and the effect of temperature and monomer concentration on the polymerization rate was investigated.The apparent activation energy was calculated as 4.86 kJ/mol.The polymerization rate was found to be dependent on the monomer concentration at 1.47 level.The effects of temperature on the relative molecular mass and its distribution were investigated.As the temperature increased,the relative molecular mass of the product decreased and the relative molecular mass distribution became wider.The optimum polymerization temperature was found to be 80 ℃.Furthermore,relative molecular mass distribution was close to 2,which was consistent with the kinetic model hypothesis that the metallocene catalyst had a single active center.Combining kinetic results with polymer properties can provide for industry a method to control PAO performance.关键词
茂金属/1-癸烯/动力学/单活性中心/相对分子质量分布Key words
metallocene/1-decene/kinetics/single active center/relative molecular mass distribution分类
化学化工引用本文复制引用
虞惠艳,米普科,潘浩,张志强,张哲..茂金属/MAO催化剂催化1-癸烯齐聚动力学[J].华东理工大学学报（自然科学版）,2018,44(1):41-46,6.基金项目
国家自然科学基金(U1362111) （U1362111）
上海市重点学科和重点实验室项目(B50208DZ2230500) （B50208DZ2230500）
