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Method for preparation of alpha-olefin by ethylene oligomerization

A technology for ethylene oligomerization and olefins, applied in chemical instruments and methods, compounds of group 4/14 elements of the periodic table, hydrocarbons, etc., to achieve the effects of avoiding the formation of high polymers, reasonable distribution, and high yield

Active Publication Date: 2019-01-15
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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  • Method for preparation of alpha-olefin by ethylene oligomerization

Examples

Experimental program
Comparison scheme
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 invention relates to a method for preparation of alpha-olefin by ethylene oligomerization. The method includes: in an inert solvent, and in the presence of a homogeneous zirconium catalyst and analkyl aluminum cocatalyst, subjecting ethylene to oligomerization at 0DEG C-150DEG C and under an ethylene pressure of not lower than 8MPa to generate alpha-olefin. Specifically, the homogeneous zirconium catalyst is prepared by reaction of ZrX4, alcohol and a silicon compound with a general formula of SiClnR4-n, wherein X is Cl, Br, or I, the alcohol is halogen atom-substituted alcohol and / or unsubstituted alcohol, n is 0, 1, 2, 3 or 4, and R is alkyl. The method provided by the invention can avoid generation of high polymers in the ethylene oligomerization process.

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 Applications(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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