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A technology of ethylene oligomerization and ethylene, which is applied in the field of olefin polymerization, can solve problems such as unreachable, harsh environmental requirements, and high unit price, and achieve high oligomerization reactivity, simplified production process, and high selectivity.
Active Publication Date: 2014-10-22
CHINA PETROLEUM & CHEM CORP +1
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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
Moreover, 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, s
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Embodiment 1
[0039] 1. Catalyst synthesis of 2-n-propionyl-1,10-phenanthroline chloride 2,6-diethylanilinate iron (II) complex
[0040] a. Synthesis of 2-n-propionyl-1,10-phenanthroline
[0041] Put 5.1 g (28.3 mmol) of 1,10-phenanthroline into a 250 ml three-necked flask, and dissolve it with 100 ml of toluene under nitrogen protection and magnetic stirring. Slowly add 13.5ml of tri-n-propylaluminum (d=0.82g / ml, 70.9mmol) dropwise to the three-necked flask under stirring at -60°C, and the dropwise addition is completed in about 15 minutes. Continue stirring at this temperature for 18 hours, and then Raise the temperature to about 30°C and continue stirring for 10h. Then the reaction mixture was cooled to about -30°C, 50ml of distilled water was slowly added thereto, and then heated to 30°C and stirred for 10h. Then separate the liquids, take out the organic phase, and extract the inorganic phase three times with dichloromethane, each time the consumption of dichloromethane is 20ml, and ...
Embodiment 2
[0054] The method of Example 1 was adopted to carry out the ethylene oligomerization reaction, the difference being that the weight content of water was 20 ppm based on the weight of the solvent 1-hexene, and the analysis results were shown in Table 1.
Embodiment 3
[0056] The method of Example 1 was adopted to carry out the ethylene oligomerization reaction, the difference being that the weight content of water was 50 ppm based on the weight of the solvent 1-hexene, and the analysis results were shown in Table 1.
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Abstract
The invention discloses an ethylene oligomerization method. Ethylene is subjected to oligomerization in a reaction system consisting of n-propiono-substituted-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. The solvent is alpha-olefin of Cn (n is greater than 4 and no less than 10). 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. The method overcomes technical biases, optimizes ethylene oligomerization process, has high oligomerization activity, enables rapid initiation, stable operation, low toxicity and environmental protection of the ethylene oligomerization process to be realized, allows good balance to be reached between a catalytic effect and cost and has good practicality; moreover, the method enables cost for ethylene oligomerization to be greatly decreased and has wide industrial prospects in overall consideration of the catalytic effect and production cost.
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 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 imine complex of (II)...
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