甲基铝氧烷的合成工艺及反应动力学  

Process and reaction kinetics of synthesis of methylaluminoxane

作　　者：韦少义 吴江 朱博超 王霞 郝萍 

机构地区：[1]中国石油兰州石化分公司石油化工研究院,甘肃兰州730060

出　　处：《石化技术与应用》2007年第1期1-4,8,共5页Petrochemical Technology & Application

基　　金：中国石油天然气股份有限公司基金资助项目(项目编号:040402-17-00)

摘　　要：介绍了硫酸铝结晶水法合成甲基铝氧烷(MAO)的反应过程,考察了MAO合成过程中反应参数、产物的组成和性能的变化情况,以及在茂金属化合物存在下,MAO助催化乙烯聚合的活性随反应过程的变化关系,并研究了三甲基铝(TMA)水解过程的动力学。结果表明:TMA水解合成MAO的反应是一个非常复杂的连串反应过程,TMA中甲基的水解反应为零级反应,反应的活化能为34470J/mol,反应的动力学速率方程为c0-ct=5870exp(-34470/RT)t;反应过程中MAO分子链增长的控制是影响MAO产物组成和产品性能的重要环节。Methylaluminoxane（MAO） was synthesized by use of crystalline aluminum sulfate and trimethylaluminum （TMA）. The changes of reaction parameters, product composition and properties of MAO as well as the hydrolytic action kinetics of TMA were investigated during the synthetic process. In the presence of metallocene catalyst, the activity of cocatalyst MAO in ethylene polymerization varying with the synthetic process above going was studied. The results show that the hydrolytic synthesis of MAO from TMA is a series of consecutive complex reactions, in which the hydrolysis of methyl belongs to zero order reaction, the activation energy and the kinetic equation of hydrolytic reaction of methyl are 34 470 J/mol and co -ct = 5 870 exp（ -34 470/ RT） t respectively. The most important factor to affect the property and product composition of MAO is to control the molecular chain growth of MAO.

关 键 词：甲基铝氧烷 三甲基铝 合成过程 反应规律 动力学 

分 类 号：TQ426.98[化学工程]