This invention provides a two stage process for the oligomerization of ethylene in the presence of a chromium catalyst having a bridging diphosphine ligand. The process mitigates problems which may be experienced during the unsteady state conditions that exist during "start up". The "start up" protocol of this process is characterized by the use of an aluminoxane activator and a comparatively large amount of a halogenated solvent. After the start up phase, a second activator (which is preferably a non-coordinating borate) is added to the reaction.
该发明提供了一种在
铬催化剂存在下进行
乙烯寡聚的两阶段过程,该催化剂具有桥联二
膦配体。该过程缓解了在“启动”期间存在的非稳态条件可能出现的问题。该过程的“启动”协议的特点是使用铝烷氧化物活化剂和相对较大量的卤代溶剂。在启动阶段之后,向反应中添加第二种活化剂(最好是非配位
硼酸盐)。