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Method for enhancing yield of linear alpha-olefins

A technology of olefin yield and linearity, applied in the direction of chemical instruments and methods, hydrocarbons, organic compounds/hydrides/coordination complex catalysts, etc., can solve problems affecting product quality, etc.

Inactive Publication Date: 2016-08-24
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods introduce new compounds into the original catalytic system, and these compounds may accumulate and remain in the final product, affecting product quality

Method used

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  • Method for enhancing yield of linear alpha-olefins
  • Method for enhancing yield of linear alpha-olefins
  • Method for enhancing yield of linear alpha-olefins

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Under the protection of nitrogen, the pyridine bis-imine ligand L{2,6-bis-[(2-methyl-4-methoxyanilinoethyl)pyridine]} shown in formula a and iron acetylacetonate After mixing at a molar ratio of 1:1, use anhydrous toluene as a solvent to prepare 4×10 -6 mol / ml of the main catalyst solution. The cocatalyst methylaluminoxane (MAO) is a 10 wt% toluene solution, and the concentration of the substance is about 1.5 mol / L.

[0052] The structural formula of 2,6-bis-[(2-methyl-4-methoxyanilinoethyl)pyridine]:

[0053]

[0054] Heat a 1L stirred tank reactor to above 90°C, vacuumize and bake for 2 hours, during which time it is replaced with high-purity nitrogen several times. Subsequently, the temperature of the reactor was adjusted to a reaction temperature of 50° C. by circulating jacketed cooling water, and 300 ml of toluene was added as an organic solvent. Set the concentration of the iron-based catalyst in the reaction medium to be 0.67×10 -5 mol / L, add a certain am...

Embodiment 2

[0057] Add hydrogen 0.10MPa at a time to ensure that the partial pressure of ethylene is 0.30MPa. At this time, the partial pressure ratio of hydrogen and ethylene is 0.33. Other operations are the same as in Example 1.

[0058] The reaction product was separated by gas-liquid-solid to obtain linear α-olefin, which was analyzed by gas chromatography to obtain 152.2g; α=0.79; the activity was 7.6×10 7 g / mol-Fe / h.

Embodiment 3

[0060] Add hydrogen 0.20MPa at a time to ensure that the partial pressure of ethylene is 0.30MPa. At this time, the partial pressure ratio of hydrogen and ethylene is 0.67. Other operations are the same as in Example 1.

[0061] The reaction product obtained linear α-olefins after gas-liquid-solid separation, and was analyzed by gas chromatography to obtain 175.4g; α=0.80; the activity was 8.8×10 7 g / mol-Fe / h.

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Abstract

The invention discloses a method for enhancing yield of linear alpha-olefins. The method comprises the following steps: introducing hydrogen into a catalytic-reaction-medium-containing oligomerization reactor as an activator, controlling at appropriate reaction temperature, introducing a vinyl monomer, keeping the reaction pressure, and carrying out oligomerization to prepare the high-grade linear alpha-olefins. The oligomerization reactor is selected from one or more of stirred tank reactors or tubular reactors, and can adopt series or parallel operation of single or multiple reactors. The hydrogen is added one or more of one-step addition, batch addition or sectionalized addition mode. The catalytic reaction medium is composed of a main catalyst, a cocatalyst and an organic solvent, wherein the main catalyst is selected from late-transition iron catalysts. The method is simple and feasible, is easy to implement, and can obviously enhance the yield of linear alpha-olefins, thereby greatly lowering the cocatalyst consumption of the unit product, and being beneficial to lowering the production cost and enhancing the economic benefits.

Description

technical field [0001] The invention relates to the field of ethylene oligomerization to prepare higher linear α-olefins, in particular to a method for increasing the yield of linear α-olefins in the ethylene oligomerization process. Background technique [0002] Linear alpha-olefins refer to C with double bonds at the ends of the molecule 4 And above linear olefins are a kind of important petrochemical raw materials with huge demand. Among them, C 4 ~C 30 The linear α-olefins have a wide range of applications in the preparation of low-density polyethylene, high-density polyethylene, high-grade detergents, high-grade alcohols, high-grade lubricating oils, surfactants and oil additives. At present, the ethylene oligomerization method is the main and most promising linear α-olefin production method. [0003] In 1998, Brookhart and Gibson's research groups independently reported iron-based catalysts with bis-imine pyridine as a ligand. This type of catalyst has a high cata...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C2/32C07C11/02B01J31/22
CPCC07C2/32B01J31/143B01J31/1805B01J31/1815B01J31/2234C07C2531/22B01J2531/842B01J2531/0244B01J2231/20B01J35/19C07C11/02
Inventor 蒋斌波吴美玲叶健陈毓明张威阳永荣王靖岱黄正梁廖祖维
Owner ZHEJIANG UNIV
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