Ethylene oligomerization method

Abstract

The invention discloses an ethylene oligomerization method. The method comprises the following steps: performing oligomerization reaction on ethylene in a reaction system which comprises a chloridized 2-acetyl-1,10-phenanthroline amine iron (II) complex main catalyst shown by a formula (I) in the specification, an aluminum-containing promoter, water and an organic solvent. According to the method disclosed by the invention, ethylene oligomerization reaction has relatively high oligomerization reaction activity and high alpha-olefin selectivity, and still has relatively good oligomerization reaction activity even under the condition of low Al / Fe ratio; and in addition, even the oligomerization reaction is performed at relatively low temperature, the relatively high oligomerization reaction activity can still be achieved. Moreover, in an oligomerization reaction process, the ethylene oligomerization method disclosed by the invention is rapid in reaction initiation, stable in operation and good in repeatability, and thus the technical biases of those skilled in the art can be overcome, unexpected technical effects can be achieved, and wide industrial prospects can be provided.

Description

technical field [0001] The invention relates to the field of ethylene oligomerization, in particular to an ethylene oligomerization reaction process method. Background technique [0002] Linear α-olefins are widely used in the fields of ethylene comonomers, surfactant synthesis intermediates, plasticizer alcohols, synthetic lubricating oils and oil additives. In recent years, with the continuous development of the polyolefin industry, the worldwide demand for α-olefins has grown rapidly. At present, the vast majority of α-olefins are prepared by ethylene oligomerization. The used catalyst of ethylene oligomerization mainly contains nickel series, chromium series, zirconium series and aluminum series etc., in recent years, Brookhart group (Brookhart, the people such as M, J.Am.Chem.Soc.,1998,120,7143-7144 ; WO99 / 02472,1999), Gibson group (Gibson, V.C. et al., Chem.Commun., 1998,849-850; Chem.Eur.J., 2000,2221-2231) found that some Fe(II) and Co The tridentate pyridine imin...

AI Technical Summary

Problems solved by technology

However, whether methylalumoxane or modified methylalumoxane is used as a cocatalyst, the cost is too high and the dosage is too large. When it is used as a cocatalyst for ethylene oligomerization on a large scale, it will inevitably lead to production costs. high

[0004] At present, it is generally believed that water is very unfavorable to the ethylene oligomerization reaction process. CN200810111717.8 discloses a method for ethylene oligomerization, which is strictly controlled in an anhydrous and oxygen-free environment. Therefore, the current ethylene oligomerization reaction is harmful to the process. The requirements are very demanding, resulting in very poor reaction initiation and repeatability of the oligomerization process

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