Synthesis method of co-catalyst for preparing linear alpha-olefin through ethylene oligomerization and ethylene oligomerization process

Abstract

The invention provides a synthesis method of a co-catalyst for ethylene oligomerization and an ethylene oligomerization process. The synthesis method comprises synthesizing the novel co-catalyst usedfor ethylene oligomerization by using an alkyl aluminum metal organic substance. A structural modifier is selected from one or more selected from phenols and other phenol-containing hydroxyl aromaticcompounds. The co-catalyst provided by the invention can be suitable for one or more primary catalysts from late-transition iron-based or cobalt-based catalysts having coordination of bidentate or tridentate ligands, and can effectively inhibit the formation of polyethylene wax when used for ethylene oligomerization, and the yield of alpha-olefin is obviously improved, so that the content of the polyethylene wax in the products of the ethylene oligomerization reaction, and the safety and stable operation of a device is facilitated for obtaining high economic benefits.

Description

Technical field [0001] The invention relates to the field of preparing high-grade linear α-olefins by ethylene oligomerization, in particular to a method for synthesizing a promoter for ethylene oligomerization. Background technique [0002] Linear α-olefins are raw materials for many products such as polyolefins and synthetic lubricants, and play a vital role in the development of national economy and even defense technology. The ethylene oligomerization method is currently the most important method for producing linear α-olefins. In 1998, Brookhart and Gibson's research group independently reported iron-based catalysts with bisiminopyridine as ligand. This type of catalyst has high catalytic activity comparable to that of metallocene catalysts, and can efficiently catalyze the non-selective oligomerization of ethylene by modifying the structure of the ligand skeleton or the aromatic ring substituent. The linear α-olefin products obtained conform to the Schulz-Flory distributio...

AI Technical Summary

Problems solved by technology

This method can significantly reduce the content of polyethylene wax while maintaining high activity, but there is still a shortage of co-catalyst consumption, and it does not change the current situation of using expensive MAO as a co-catalyst

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