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Ethylene tetramerization method

A technology of ethylene tetramerization and selection, which is applied in the direction of chemical instruments and methods, hydrocarbons, organic compounds/hydrides/coordination complex catalysts, etc., and can solve the problem of polymerization reaction process reaction initiation, poor repeatability, and harsh process requirements , high production costs and other issues, to achieve the effect of rapid response, good repeatability and low requirements

Active Publication Date: 2016-05-11
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Aluminum alkoxide (including methylalumoxane, modified methylalumoxane, etc.) as a cocatalyst has the problems of high cost and excessive dosage. When it is applied to ethylene tetramerization on a large scale, it will inevitably lead to production costs. high
Moreover, it is generally believed that water is very unfavorable to the ethylene tetramerization process. The existing ethylene oligomerization methods are all strictly controlled to react in an anhydrous and oxygen-free environment, and the process requirements are very harsh, resulting in the reaction of the polymerization process. Initiation and repeatability are very poor

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0030] Ethylene tetramerization reaction specifically comprises the following steps: (1) in a continuous reaction device, ethylene containing water, solvent methylcyclohexane, main catalyst 1 (concentration is 2.5 μ mol / mL, such as formula I, wherein R 1 , R 2 , R 3 and R 4 Both are phenyl, R 5 is cyclohexyl, M is chromium, X is chlorine, n=3), cocatalyst triethylaluminum solution (concentration is 1mmol / mL) enters reactor respectively, and its flow rate is 80g / h, 160g / h, 3.5g / h, 2.6g / h, keeping the Al / Cr mol ratio in the reaction system is 300, keeping the residence time of the reaction material in the reactor is 30 minutes;

[0031] (2) The reaction pressure is 4MPa and the reaction temperature is 40°C, wherein, taking ethylene as the calculation basis, the mass content of water is 15ppm;

[0032] (3) Carry out gas chromatography (GC) analysis to the reaction outlet material. See Table 1 for the data.

Embodiment 2

[0034] Same as Example 1, the difference is that the mass content of water is 50ppm. See Table 1 for the data.

Embodiment 3

[0036] Same as Example 1, the difference is that the mass content of water is 150ppm. See Table 1 for the data.

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Abstract

The invention provides an ethylene tetramerization method. The method comprises a step of carrying out an ethylene tetramerization reaction in the presence of a main catalyst as shown in a formula (I) which is described in the specification, a cocatalyst, an organic solvent and water. In the formula (I), R1, R2, R3, R4 and R5 are identical or different and are independently selected from a group consisting of an alkyl group, a cycloalkyl group and monocyclic and polycyclic aryl groups; M is a transition metal; X is halogen; and n is an integer in a range of 1 to 3.

Description

technical field [0001] The invention relates to the field of ethylene oligomerization, in particular to a method for ethylene tetramerization. Background technique [0002] As an important organic raw material and chemical intermediate, 1-octene is mainly used to produce high-quality polyethylene (PE). The linear low-density polyethylene (LLDPE) produced by the copolymerization of 1-octene and ethylene can significantly improve the properties of PE, especially the mechanical properties, optical properties, tear strength and impact strength of polyethylene. , very suitable for packaging films and agricultural covering films such as greenhouses and sheds. At the same time, 1-octene is also used as an intermediate for plasticizers, fatty acids, alcohols for detergents, and lubricating oil additives. [0003] The traditional 1-octene production method is the ethylene oligomerization method. The ethylene oligomerization technology follows the Schulz-Flory distribution, not only ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/02C07C11/107C07C2/22B01J31/24
Inventor 吴红飞王霄青韩春卉郑明芳刘珺祁彦平栗同林
Owner CHINA PETROLEUM & CHEM CORP
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