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Method for synthesizing ligand for ethylene trimerization or tetramerization catalyst and ligand synthesized thereby and application thereof

A catalyst and ligand technology, which is applied in the synthesis of ligands for ethylene trimerization or tetramerization catalysts, and the synthesized ligands and application fields, can solve the problems of low product yield, increased cost, and impact on cost, etc.

Active Publication Date: 2011-05-04
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This synthesis method is complex, with many steps, the final product yield is low, and the cost increases, which affects the cost of preparing 1-hexene and 1-octene as an ethylene oligomerization catalyst for this type of ligand

Method used

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  • Method for synthesizing ligand for ethylene trimerization or tetramerization catalyst and ligand synthesized thereby and application thereof
  • Method for synthesizing ligand for ethylene trimerization or tetramerization catalyst and ligand synthesized thereby and application thereof
  • Method for synthesizing ligand for ethylene trimerization or tetramerization catalyst and ligand synthesized thereby and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] A 300ml stainless steel polymerization kettle is used. The autoclave was heated to 80°C, evacuated and replaced with nitrogen for several times, and then filled with ethylene until the pressure of ethylene was 4 MPa and cooled to room temperature. Then add dehydrated toluene at 30°C, and simultaneously add 20 μmol of the ligand and chromium acetylacetonate and cocatalyst methylaluminoxane (MAO) in Example 1 of the ligand synthesis, the total volume of the mixed solution is 100mL, and the ligand, acetyl The molar ratio of chromium acetone and cocatalyst is 2:1:300, the reaction pressure is controlled at 2.0 MPa, and ethylene is fed to carry out ethylene tetramerization reaction.

[0082] After the reaction was completed, the system was cooled to room temperature, the gas phase product was collected in a gas metering tank, and the liquid phase product was collected in an Erlenmeyer flask, and 1 mL of ethanol was added as a terminator to terminate the ethylene oligomerizat...

Embodiment 2

[0085] The pressure of polymerization reaction is replaced by 3.0MPa, other conditions are the same as oligomerization embodiment 1;

[0086] The measured reaction result is: the catalytic activity is 2.98×10 6 g / mol Cr·h, the selectivity of 1-octene is 70.28%, and the normal structure rate reaches 98.87%; the selectivity of 1-hexene is 18.09%, and the normal structure rate reaches 71.06%.

Embodiment 3

[0088] The pressure of polymerization reaction is replaced by 4.0MPa, other conditions are the same as oligomerization embodiment 1;

[0089] The measured reaction result is: the catalytic activity is 3.43×10 6 g / mol Cr·h, the selectivity of 1-octene is 71.03%, and the normal structure rate reaches 99.01%; the selectivity of 1-hexene is 17.65%, and the normal structure rate reaches 77.54%.

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Abstract

The invention relates to a method for preparing a ligand (I) shown as a general formula, wherein R is the same or different, is selected from hydrogen, alkyl, alkoxy and cycloalkyl, and is ortho, meta or para to P; and R' is selected from the hydrogen, the alkyl, the cycloalkyl and monocylic or polycyclic aryl. The invention also relates to the ligand prepared by the method and application thereof. The ligand (I) is shown in the specifications.

Description

technical field [0001] The invention relates to a method for synthesizing a ligand for ethylene trimerization or tetramerization catalyst, the ligand synthesized therefrom, a catalyst system for ethylene trimerization or tetramerization and application thereof. The catalyst system of the present invention facilitates the production of 1-octene or 1-hexene with high selectivity. Background technique [0002] As important organic raw materials and chemical intermediates, 1-hexene and 1-octene are mainly used to produce high-quality polyethylene (PE). The linear low-density polyethylene (LLDPE) produced by the copolymerization of 1-hexene or 1-octene and ethylene can significantly improve the properties of PE, especially the mechanical properties, optical properties, tear strength and impact resistance of polyethylene. The strength has been significantly improved, and it is very suitable for packaging films and agricultural covering films such as greenhouses and greenhouses. A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F9/50B01J31/24B01J37/00C07C2/36C07C11/02C07C11/107
CPCY02P20/52
Inventor 吴红飞栗同林华炜张凌燕张立超牛彤霞
Owner CHINA PETROLEUM & CHEM CORP