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A kind of method for preparing alpha-olefin by oligomerization of ethylene

A technology for ethylene oligomerization and olefin, which is applied in chemical instruments and methods, compounds of elements of Group 4/14 of the periodic table, catalysts for physical/chemical processes, etc., to achieve reasonable distribution, high yield, and avoid the formation of high polymers Effect

Active Publication Date: 2021-06-11
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the aforementioned documents have improved the zirconium-based ethylene oligomerization catalysts, there is still room for improvement in terms of the yield of C6-C20 and the yield of α-olefins

Method used

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  • A kind of method for preparing alpha-olefin by oligomerization of ethylene

Examples

Experimental program
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Effect test

Embodiment 1

[0054] This example illustrates the preparation of an ethylene oligomerization catalyst.

[0055] 2.33g (10mmol) ZrCl 4 Place in a three-necked flask, add 30 mL of toluene, heat to 70°C, reflux and stir for 1 hour, add 2.85 mL (30 mmol) of 1,3-dichloro-2-propanol dropwise, continue to reflux for 4 hours, cool down, and place in an ice-water bath 3.82mL (30mmol) trimethylchlorosilane was added dropwise under the condition, reacted for 4 hours, and toluene was added until the solution was 50mL to obtain an oligomerization catalyst solution A with a zirconium concentration of 0.2 mol / liter.

Embodiment 2

[0057] This example illustrates the preparation of an ethylene oligomerization catalyst.

[0058] The same method as in Example 1 was adopted, except that 3.0 mL (30 mmol) of 4-chloro-1-butanol was used instead of 1,3-dichloro-2-propanol to prepare catalyst solution B.

Embodiment 3

[0060] This example illustrates the preparation of an ethylene oligomerization catalyst.

[0061] The same method as in Example 1 was adopted, except that 3.75 mL (30 mmol) of heptafluorobutanol was used instead of 1,3-dichloro-2-propanol to prepare catalyst solution C.

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Abstract

The present invention relates to a method for preparing α-olefin by ethylene oligomerization. In the method, in the presence of a homogeneous zirconium catalyst and an alkylaluminum co-catalyst, the temperature of ethylene at 0°C to 150°C and not lower than Oligomerization occurs under the ethylene pressure of 8MPa to generate α-olefins; wherein, the homogeneous zirconium catalyst is composed of ZrX 4 , alcohol and the general formula is SiCl n R 4‑n prepared by reacting a silicon compound; wherein, X is Cl, Br, or I, the alcohol is an alcohol substituted by a halogen atom and / or an unsubstituted alcohol, n is 0, 1, 2, 3 or 4, and R is Hydrocarbyl. By adopting the method of the invention, high polymers can be avoided in the process of ethylene oligomerization.

Description

technical field [0001] The invention relates to a method for preparing α-olefin by ethylene oligomerization. In particular, the present invention relates to a process for the preparation of linear alpha-olefins by oligomerization of ethylene using a homogeneous zirconium catalyst. Background technique [0002] It is customary in the industry to refer to terminal olefins above C4 (double bonds at the end of the molecular chain) as α-olefins. As an industrial product, α-olefins have a wide range of carbon numbers (C4-C40), and straight-chain α-olefins with carbon numbers ranging from C6 to C20 are widely used. [0003] Olefin oligomerization is the main way to produce α-olefins. At present, the relatively mature processes include Gulf method, Ethyl method and SHOP method. The catalysts used in these three processes are alkyl aluminum or nickel compounds. The reaction conditions are relatively harsh, and the pressure can generally be up to tens of MPa. Compared with these th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C2/26C07C11/08C07C11/107C07C11/02C07F7/12C07F7/18B01J31/14
CPCB01J31/143B01J2231/20C07C2/26C07F7/126C07F7/188C07F7/1888C07C11/08C07C11/107C07C11/02Y02P20/52
Inventor 荣峻峰宗明生
Owner CHINA PETROLEUM & CHEM CORP
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