A kind of method of ethylene oligomerization

Abstract

The present invention discloses an ethylene oligomerization method, which comprises that ethylene is subjected to an oligomerization reaction in a reaction system containing an iron 2-benzoyl-1,10-phenanthroline polyamine chloride coordination compound main catalyst represented by a formula (I), an aluminum-containing cocatalyst, water and an organic solvent, wherein the organic solvent is alpha-olefin of Cn (n is more than 4 and is less than or equal to 10), and in the formula, R1-R5 are respectively and independently selected from hydrogen, C1-C6 alkyl, halogen, C1-C6 alkoxy and nitro. According to the present invention, the technical prejudice is overcome, and the oligomerization reaction process is optimized, such that the oligomerization activity is high, the ethylene oligomerization reaction process has characteristics of rapid initiation, stable operation, low toxicity, environmental protection, good catalysis effect and cost balancing, and strong practicality, the ethylene oligomerization reaction cost is substantially reduced, the catalytic effect and the production cost are comprehensively considered, and the industrial prospect is broad.

Description

Technical field [0001] The invention relates to the field of olefin polymerization, in particular to a method for ethylene oligomerization. Background technique [0002] Linear α-olefins are widely used in the fields of ethylene comonomers, surfactant synthesis intermediates, plasticizer alcohols, synthetic lubricants and oil additives. In recent years, with the continuous development of the polyolefin industry, the worldwide demand for α-olefins has increased rapidly. At present, most α-olefins are prepared by oligomerization of ethylene. The catalysts used in the ethylene oligomerization method mainly include nickel-based, chromium-based, zirconium-based, and aluminum-based catalysts. In recent years, the Brookhart group (Brookhart, M et al., J. Am. Chem. Soc., 1998, 120, 7143-7144 ; WO99 / 02472, 1999), Gibson group (Gibson, VC et al., Chem. Commun., 1998, 849-850; Chem. Eur. J., 2000, 2221-2231) found some Fe(II) and Co The tridentate pyridine imine complex of (II) can catal...

AI Technical Summary

Problems solved by technology

Whether it is methylalumoxane or modified methylalumoxane, the unit price is relatively high, and when it is used for 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 process

In addition, the oligomerization reaction has very strict requirements on the initiation environment, and it is strictly required to be carried out in an anhydrous and oxygen-free environment. Due to the special conditions, it is very difficult to achieve, so the reaction initiation, stability and repeatability of the oligomerization process are also very poor.

In addition, the organic solvent used in the oligomerization process is generally toluene. As we all know, toluene is a toxic aromatic hydrocarbon, which is irritating to the skin and mucous membranes and has an anesthetic effect on the central nervous system; and in the oligomerization products, the toluene content is relatively large , unable to meet the requirements for aromatic hydrocarbon content when used as a comonomer

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