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Method for improving performance of ethylene trimerization catalyst

An ethylene trimerization and catalyst technology, which is applied in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve the problems of cumbersome implementation process and general catalyst activity, and achieves a simple and easy modification method. Ease of implementation and improved purity

Active Publication Date: 2013-05-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this patent, at least two of the components need to be preheated to above 100°C and kept for more than 30 minutes, and the implementation process is relatively cumbersome
[0005] In CN1606538, it is reported that a chromium series catalyst that adopts sulfur-nitrogen ligand is used to catalyze ethylene trimerization to produce 1-hexene. When the system uses the expensive additive MAO, its catalyst activity is also average, which cannot meet the demand

Method used

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  • Method for improving performance of ethylene trimerization catalyst
  • Method for improving performance of ethylene trimerization catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Weigh 0.4861 g of chromium isooctanoate (0.001 mol of chromium) and dilute to 100 ml with dehydrated n-heptane, and the concentration of chromium in the solution is 0.01 mmol / ml. Prepare 100ml of n-heptane solution of 2,5-dimethylpyrrole, triethylaluminum and hexachloroethane in the same way, the concentrations are 0.03mmol / mL of 2,5-dimethylpyrrole and 0.5mmol / mL of triethylaluminum mmol / mL, hexachloroethane 0.05mmol / mL, spare.

Embodiment 2

[0025] In a 500ml round bottom flask equipped with mechanical stirring and reflux condensation, add 100ml of chromium isooctanoate solution, 100ml of 2,5-dimethylpyrrole solution and 100ml of hexachloroethane solution prepared in Example 1, and place in microwave In the reactor, act for 15 minutes under the power of 500w.

[0026] A 300ml stainless steel polymerization kettle was used for the polymerization reaction. First, the pressure-holding test of the reactor was carried out. Under the condition that the seal of the reactor was confirmed to be intact, it was replaced three times with high-purity nitrogen and three times with high-pressure ethylene. Add 100ml of dehydrated n-heptane at room temperature, raise the temperature to 80°C, add 3ml of the above-prepared mixed solution and 1ml of triethylaluminum solution in sequence, start stirring, and immediately feed ethylene to trigger ethylene oligomerization, and the reaction system The temperature control is maintained at...

Embodiment 3

[0029] According to the operation and proportioning in Example 2, except that the microwave radiation power is 200w and the radiation time is 60 minutes, all the other conditions are the same as in Example 2. The results of ethylene trimerization are shown in Table 2.

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Abstract

The invention provides a method for improving performance of an ethylene trimerization catalyst. The ethylene trimerization catalyst at least comprises the following catalyst components: a chromium-containing compound a, a pyrrole derivative b, an alkyl aluminum compound c and a chlorinated compound d as a modifier; and three of the catalyst components a, b, c and d are dispersed in an organic solvent and radiated by microwave. The modification method of trimerization catalyst provided by the invention is simple, practical, easy for implement, green and environment-friendly; the catalyst modified by microwave irradiation has high catalytic activity; and purity of an ethylene trimerization reaction product 1-hexene increases substantially.

Description

technical field [0001] The invention relates to a method for improving the performance of an olefin oligomerization catalyst, in particular to a method for improving the performance of an ethylene trimerization catalyst. Background technique [0002] Ethylene oligomerization is one of the most important reactions in the olefin polymerization industry. Through oligomerization, cheap small molecule olefins can be transformed into products with high added value, such as 1-hexene and 1-octene. Among them, 1-hexene is an important comonomer for the production of LLDPE and HDPE, and is also a raw material for some fine chemicals. Compared with 1-butene copolymer, LLDPE resin copolymerized with 1-hexene has significantly better tensile strength, impact strength, tear resistance and durability, and is especially suitable for packaging films and greenhouses and sheds And other agricultural mulch film. With the continuous development of high-efficiency polymerization processes, the ...

Claims

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Application Information

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IPC IPC(8): C07C11/107C07C2/30B01J31/14B01J37/34
CPCY02P20/52
Inventor 祁彦平栗同林隋军龙吴红飞张立超
Owner CHINA PETROLEUM & CHEM CORP
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