Catalyst composition for ethylene oligomerization and application thereof

Abstract

The invention discloses a catalyst composition for ethylene oligomerization. The catalyst composition comprises chlorinated-2-isobutyryl-1,10-phenanthroline amine iron (II) which is shown in a formula (I) as described in the specification and is used as a main catalyst, an aluminum-containing cocatalyst, water and an organic solvent. In the formula (I), R1 to R5 are independently selected from the group consisting of hydrogen, C1-C6 alkyl groups, halogen, C1-C6 alkoxy groups and a nitro group. With the oligomerization catalyst composition and method provided by the invention for ethylene oligomerization, technical biases are overcome, ethylene oligomerization process is optimized, high oligomerization activity is obtained, the application amount of the cocatalyst is small, rapid initiation and stable operation of ethylene oligomerization process are realized, good balance is reached between a catalytic effect and cost, good practicality is obtained, and cost for ethylene oligomerization is greatly decreased; in overall consideration of the catalytic effect and production cost, the catalyst has wide industrial prospects.

Description

technical field [0001] The invention relates to the field of ethylene polymerization, in particular to an ethylene oligomerization catalyst composition. The present invention also relates to the use of the catalyst composition described above. 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; ...

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Problems solved by technology

[0004] From the teaching of this document, it can be seen that when triethylaluminum is a cocatalyst, even at a high cocatalyst dosage, the oligomerization activity is still relatively low, and the practicability is poor, so high-cost methylaluminum is mainly used in the prior art oxane as cocatalyst

However, the cost of methylaluminoxane is too high and the dosage is too large. When it is used as a cocatalyst in ethylene oligomerization on a large scale, it will inevitably lead to high production costs.

At present, it is generally believed that water is very unfavorable to the ethylene oligomerization reaction process; at the same time, because the oligomerization reaction has very strict environmental requirements for initiation, it is strictly controlled in an anhydrous and oxygen-free environment, and it is very difficult to achieve due to special conditions, so The reaction initiation as well as the stability and reproducibility of the oligomerization process are also very poor

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