Organic ligand, preparation method thereof and catalyst for ethylene selective oligomerization

A technology of organic ligands and catalysts is applied in the field of catalysts for selective oligomerization of ethylene, which can solve the problems of insufficient production capacity of advanced linear α-olefins, and achieve the effects of rapid separation, reliable and high activity.

Pending Publication Date: 2022-08-02
SHANDONG JINGBO PETROCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the development of a highly active ethylene oligomerization catalytic system is of great significance for promoting the industrialization of ethylene oligomerization to produce advanced linear α-olefins and solving the problem of insufficient production capacity of advanced linear α-olefins in China.

Method used

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  • Organic ligand, preparation method thereof and catalyst for ethylene selective oligomerization
  • Organic ligand, preparation method thereof and catalyst for ethylene selective oligomerization
  • Organic ligand, preparation method thereof and catalyst for ethylene selective oligomerization

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preparation example Construction

[0042] The invention provides a preparation method of an organic ligand, comprising the following steps:

[0043] a) reacting the phosphine compound of formula (i), paraformaldehyde and the primary amine of formula (ii) in a solvent to obtain an intermediate of formula (iii);

[0044] b) in the presence of triethylamine, the intermediate of the formula (iii) is mixed with the para-substituted pyridine of the structure of the formula (iv) to obtain the organic ligand of the formula (I);

[0045]

[0046] R 1 and R 2independently selected from substituted or unsubstituted C1-C10 alkyl, C1-C10 alkenyl; C6-C10 cycloalkyl, C6-C10 aryl;

[0047] R 3 Selected from C1-C10 alkyl, C6-C10 cycloalkyl, C6-C10 aryl;

[0048] R 4 It is selected from halogen, C1-C10 alkyl, C1-C10 alkenyl or C6-C10 cycloalkyl.

[0049] In the preparation method provided by the present invention, firstly, the structural phosphine of formula (i), paraformaldehyde and the primary amine of formula (ii) ar...

Embodiment 1

[0070] 1) Synthesis of ligand L1:

[0071]

[0072] The first step, diphenylphosphine (0.1mol), paraformaldehyde (polymerization degree is 2-10, with -CH 2 The number of moles in terms of O- is 0.12mol) and cyclopentylamine (0.12mol) were added to 100mL of methanol and toluene (v / v=2:1) ​​solution, heated to reflux overnight, and then cooled to room temperature. The solvent was distilled off under reduced pressure to obtain a yellow oil, which was dissolved in 20 mL of THF, dried over anhydrous magnesium sulfate, filtered, the filtrate was distilled under reduced pressure, 15 mL of ether was added, and the precipitated solid was precipitated with a yield of 91 %;

[0073] In the second step, the solid precipitate (0.11 mol) was dissolved in 80 mL of ether, triethylamine (0.15 mol) was added and stirred for 20 min, the mixture was cooled to 0°C, and 4-picoline (0.12 mol) was added dropwise to the reaction solution. ), continue to stir for 30 min after the dropwise addition...

Embodiment 2

[0080] 1) Synthesis of ligand L2:

[0081]

[0082] The first step, diethylphosphine (0.1mol), paraformaldehyde (polymerization degree is 2-10, with -CH 2 The number of moles in terms of O- is 0.12 mol) and isopropylamine (0.12 mol) were added to 100 mL of methanol and toluene (v / v=2:1) ​​solution, heated to reflux overnight, then cooled to room temperature, and the reaction solution was reduced The solvent was distilled off under pressure to obtain a yellow oil, which was dissolved in 30 mL of THF, dried with anhydrous magnesium sulfate, filtered, the filtrate was distilled under reduced pressure, 20 mL of ether was added, the precipitated solid was precipitated, and the yield was 90%. ;

[0083] In the second step, the solid precipitate (0.105mol) was dissolved in 80mL of ether, triethylamine (0.18mol) was added and stirred for 20min, the mixture was cooled to 0°C, and 4-fluoropyridine (0.11mol) was added dropwise to the reaction solution. , continue to stir for 30 min ...

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Abstract

The invention provides a catalyst for ethylene selective oligomerization. The catalyst comprises a main catalyst and a cocatalyst, the main catalyst comprises an organic ligand with a structure shown in a formula (I) in any one of the technical schemes and an organic chromium compound. Experimental results show that the catalytic system containing the organic ligand a has high activity of catalyzing ethylene selective oligomerization, the catalytic activity reaches up to 12.59 * 106 g / (mol Cr.h), the generation amount of a polymer is reduced to 0.1 wt% or below, and the polymer is easy to separate from a reaction mixed solution, so that the stable proceeding of ethylene oligomerization reaction is ensured, and the yield of ethylene is improved. And a reliable guarantee is provided for realizing industrialization of ethylene oligomerization continuous reaction and rapid product separation.

Description

technical field [0001] The invention relates to the technical field of olefin polymerization catalysts, in particular to an organic ligand, a preparation method thereof and a catalyst for selective oligomerization of ethylene. Background technique [0002] Advanced linear α-olefins such as 1-hexene and 1-octene are an important class of organic chemical raw materials, and have a wide range of applications in the fields of polyolefin comonomers, surfactant synthesis intermediates, synthetic lubricating oils and oil additives. application. At present, the production capacity of high-grade linear α-olefins in China is seriously insufficient, especially the high-grade linear α-olefins of C8 and above all rely on imports. [0003] The production of advanced linear α-olefins by ethylene oligomerization is an emerging technology for the production of advanced linear α-olefins in recent years. The vigorous development of ethylene selective oligomerization has also made new catalyst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F9/58B01J31/24C07C2/36C07C11/02C07C11/107
CPCC07F9/58B01J31/2404C07C2/36B01J2231/20B01J2531/62C07C11/02C07C11/107Y02P20/52
Inventor 张蒙刘鹏冯其龙徐英博卫旭光仝保田
Owner SHANDONG JINGBO PETROCHEM
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