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A kind of supported mgcl2/tcl4 catalyst modified by salicylaldimine type modifier and its preparation method and application

A technology of salicylaldimine type and catalyst, which is applied in the chemical industry to achieve the effect of increasing insertion amount, uniform composition distribution and increasing molecular weight

Active Publication Date: 2018-11-30
SINOPEC YANGZI PETROCHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing industrial production devices are all designed on the basis of heterogeneous Ziegler-Natta catalysts. Applying this homogeneous catalyst to industrial production requires a major modification or even redesign of the existing production devices.

Method used

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  • A kind of supported mgcl2/tcl4 catalyst modified by salicylaldimine type modifier and its preparation method and application
  • A kind of supported mgcl2/tcl4 catalyst modified by salicylaldimine type modifier and its preparation method and application
  • A kind of supported mgcl2/tcl4 catalyst modified by salicylaldimine type modifier and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Take about 1g of industrial loaded TiCl 4 / MgCl 2 Catalyst, add 20mL of n-heptane. According to the molar ratio of modifier to Ti being 0.5, take a corresponding amount of modifier L1, dissolve it in 30 mL of n-heptane, add it all at once to the reaction system, and continue to stir and react at 30°C for 4 hours. Stand for stratification, take out the supernatant, wash twice with 20mL n-heptane, take out the supernatant, and finally vacuum-dry at 60°C to obtain the modified catalyst Cat-1.

[0030]Using 17mg of Cat-1 as the main catalyst, catalyzed the slurry polymerization of ethylene and 1-hexene in a 100mL round bottom flask at 60°C and normal pressure under the protection of nitrogen. TEA was added as a cocatalyst according to the aluminum-titanium molar ratio of 100, 1-hexene was added as a co-monomer at a concentration of 0.2 mol / L, and 50 mL of n-heptane was used as a solvent, and polymerized for 30 minutes to obtain 4.1 g of a polymer. The catalytic activity ...

Embodiment 2

[0032] The preparation method of modified catalyst and polymerization condition are all the same as embodiment 1, only promotor TEA is changed into MAO. 4.7 g of polymer were obtained. The catalytic activity was 554 g polymer / g catalyst·h. The weight average molecular weight of the polymer is 143.9 kg / mol, the molecular weight distribution index is 6.7, the 1-hexene structural unit content in the polymer is 7.6 mol%, [H]s / [H]i=5.2.

Embodiment 3

[0034] The preparation method and polymerization conditions of the modified catalyst are all the same as in Example 1, except that the cocatalyst TEA is changed into MMAO. 4.9 g of polymer were obtained. The catalytic activity was 578 g polymer / g catalyst·h. The weight average molecular weight of the polymer is 152.3 kg / mol, the molecular weight distribution index is 5.8, the 1-hexene structural unit content in the polymer is 7.8 mol%, [H]s / [H]i=3.8.

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Abstract

The invention provides a supported MgCl2 / TiCl4 catalyst modified by using salicylaldimine, and a preparation method and application thereof in preparing an ethylene / alpha-olefin copolymer. According to the invention, a salicylaldimine type modifying agent containing different substituents is used to modify a conventional supported MgCl2 / TiCl4 catalyst, and ethylene and alpha-olefin are catalyzed to copolymerize. The used salicylaldimine type modifying agent provided by the invention has simple synthetic method; the modified catalyst prepared by using the salicylaldimine type modifying agent has catalytic activity which is slightly lower than or slightly higher than the catalytic activity before modification; meanwhile, the ethylene / alpha-olefin copolymer obtained by polymerization has the characteristics of narrowed composition distribution, enlarged molecular weight, etc.

Description

technical field [0001] The invention belongs to the field of chemical engineering, in particular to a loaded MgCl modified with a salicylaldimine type modifier. 2 / TiCl 4 Catalyst, its preparation method and its application in preparation of ethylene / α-olefin copolymer. Background technique [0002] Linear low-density polyethylene (LLDPE) is a polyethylene variety developed in the 1970s. It is mainly obtained by the coordination polymerization of ethylene and α-olefins. The common α-olefins used to synthesize LLDPE are mainly 1-butane ene, 1-hexene, 1-octene, etc. Compared with traditional low-density polyethylene, because it can controllably adjust the length and degree of branching of the branch chain, the tensile strength, tear strength, environmental stress cracking resistance, etc. have been significantly improved. [0003] The catalysts commonly used in the industry to synthesize LLDPE mainly include metallocene catalysts and Ziegler-Natta catalysts. The metallocen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F4/651C08F210/02
Inventor 胡庆云范志强傅智盛笪文忠梅利屠嵩涛李栋
Owner SINOPEC YANGZI PETROCHEM
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