Method for improving yield of alpha-olefin in ethylene oligomerization reaction

An olefin yield, ethylene oligomerization technology, applied in chemical instruments and methods, hydrocarbons, hydrocarbons, etc., can solve the problems of increasing separation costs, affecting product quality, etc., achieving good economic benefits, improving reactivity, Easy to achieve effects

Pending Publication Date: 2022-04-29
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods will lead to the accumulation of newly added compounds in the final product, which not only increases the cost of separation, but also affects the quality of the product

Method used

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  • Method for improving yield of alpha-olefin in ethylene oligomerization reaction
  • Method for improving yield of alpha-olefin in ethylene oligomerization reaction
  • Method for improving yield of alpha-olefin in ethylene oligomerization reaction

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Experimental program
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Effect test

Embodiment 1

[0047] Under nitrogen protection, the bis-imine pyridine ligand L{2,6-bis-[(2-methylanilinoethyl)pyridine]} shown in formula a is molar ratio 1 with ferrous chloride: After compounding of 1, a catalyst represented by formula a' is obtained. dubbed 4×10 -6 mol / mL of the main catalyst toluene suspension. The cocatalyst methylaluminoxane (MAO) is a 10 wt% toluene solution, and the concentration of the substance is about 1.5 mol / L.

[0048] Catalyst LFeCl 2 The structural formula:

[0049]

[0050] Heat the 250ml oligomerization reactor to above 90°C, vacuum bake for 2 hours, and replace it with high-purity nitrogen several times during this period. Subsequently, the temperature of the reactor was adjusted to a reaction temperature of 50° C. by circulating jacketed cooling water, and 50 mL of toluene was added as a reaction medium. Add cocatalyst MAO (denoted as Al MAO ) and activity modulator AlCl 3 , and stirred for 30 minutes. Subsequently, open the ethylene pressure...

Embodiment 2

[0053] Activity modulator is AlCl 3 , [AlCl 3 ]:[Al MAO ]=0.04, other operations are the same as embodiment 1. The reaction product was separated to obtain linear α-olefin, which was analyzed by gas chromatography to obtain 2.43g; K=0.73; the activity was 2430kg·(mol-Fe·h) -1 .

Embodiment 3

[0055] Activity modulator is AlCl 3 , [AlCl 3 ]:[Al MAO ]=0.08, other operations are the same as embodiment 1. The reaction product was separated to obtain linear α-olefin, which was analyzed by gas chromatography to obtain 3.57g; K=0.70; the activity was 3570kg·(mol-Fe·h) -1 .

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Abstract

The invention relates to a method for increasing the yield of alpha-olefin in ethylene oligomerization reaction, which comprises the following steps: S1, pre-mixing a cocatalyst, an activity regulator and a transition metal main catalyst or respectively adding the cocatalyst, the activity regulator and the transition metal main catalyst into an oligomerization reactor containing a reaction medium; carrying out oligomerization to prepare high-grade linear alpha-olefin; wherein the activity regulator is selected from one or more of metal halides with a general formula of M-Xn. The method provided by the invention is simple, feasible and easy to realize, and can obviously improve the yield of linear alpha-olefin, thereby greatly reducing the consumption of the cocatalyst per unit product, and being beneficial to reducing the production cost and improving the economic benefit.

Description

technical field [0001] The invention relates to the field of ethylene oligomerization to prepare higher linear α-olefins, in particular to a method for increasing the yield of linear α-olefins in the ethylene oligomerization process. Background technique [0002] Linear alpha-olefins refer to C with double bonds at the ends of the molecule 4 And above linear olefins are a kind of important petrochemical raw materials with huge demand. Among them, C 4 ~C 30 The linear α-olefins are widely used in many fields such as the preparation of linear low-density polyethylene, high-density polyethylene, high-grade detergents, high-grade alcohols, high-grade lubricating oils, surfactants and oil additives. At present, the ethylene oligomerization method is the main and most promising linear α-olefin production method. [0003] In 1998, Brookhart and Gibson's research groups independently reported iron-based catalysts with bis-imine pyridine as a ligand. This type of catalyst has a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C2/22C07C11/02
CPCC07C2/22C07C2531/22C07C11/02
Inventor 霍宏亮蒋斌波蒋岩于部伟徐显明王力搏马立莉牟玉强王亚丽曹媛媛王斯晗褚洪岭马克存张永军汲永钢佟铁鑫徐婷婷叶健黄付玲孙维林如海王紫东韩云光韩雪梅
Owner PETROCHINA CO LTD
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