Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Ligand based on pyridine structure and preparation method thereof, and supported catalyst based on pyridine structure and preparation method and application thereof

A technology of pyridine and ligands, which is applied in ethylene oligomerization, preparation, ligands based on pyridine structure and its preparation, and the field of supported catalysts based on pyridine structure, which can solve the problems of difficult equipment blockage and avoid equipment blockage , high target product selectivity, and the effect of reducing the probability of clogged pipelines

Active Publication Date: 2021-06-22
WANHUA CHEM GRP +1
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the deficiencies in the prior art, the invention provides a ligand based on the pyridine structure and its preparation method, a supported catalyst based on the pyridine structure, its preparation method and its application in ethylene oligomerization. The supported catalyst prepared by the ligand will become the attachment point in the reaction, so that the shape of the generated polyethylene is similar to that of the carrier, avoiding the formation of waxy and filamentous polyethylene, so that it can flow out of the reactor with the solvent, and it is not easy to block the equipment , reduce a series of problems caused by physical and chemical cleaning

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Ligand based on pyridine structure and preparation method thereof, and supported catalyst based on pyridine structure and preparation method and application thereof
  • Ligand based on pyridine structure and preparation method thereof, and supported catalyst based on pyridine structure and preparation method and application thereof
  • Ligand based on pyridine structure and preparation method thereof, and supported catalyst based on pyridine structure and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] The preparation method of ligand (L1):

[0088] 1) First, heat 2,6-dibromo-4-methylpyridine (105.5mmol) and methylamine aqueous solution (211mmol) at 180°C for 5h, filter after cooling, add water (400ml) and dichloromethane ( 200ml) extraction, remove dichloromethane under vacuum conditions, the obtained product is subjected to column chromatography (height-to-diameter ratio is 2, residence time is 2min purification), and the eluent phase is ethyl acetate and n-hexane with a volume ratio of 1:1 mixed solvent, and the product was obtained after drying.

[0089] The product (80mmol) was dissolved in acetonitrile (100ml) solvent, then n-butyllithium (160mmol) was added at -80°C, reacted for 3h, the temperature was raised to -5°C and diphenylphosphine chloride (160mmol) was added, and the reaction After 1h, the reaction solution was purified by column chromatography (height-to-diameter ratio: 2, residence time: 2min), the eluting phase was a mixed solvent of ethyl acetate ...

Embodiment 2

[0096] Ligand (L2) differs from the preparation method in Example 1 in that:

[0097]1) First, heat 2,6-dibromo-4-methylpyridine (105.5mmol) and isopropylamine (232.1mmol) at 185°C for 6h, filter after cooling, add water (600ml) and dichloromethane ( 200ml) extraction, remove dichloromethane under vacuum conditions, the obtained product is subjected to column chromatography (height-to-diameter ratio is 2, residence time is 2min purification), and the eluent phase is ethyl acetate and n-hexane with a volume ratio of 1:1 mixed solvent, and the product was obtained after drying.

[0098] Dissolve the product in acetonitrile (80mmol) solvent, then add n-butyllithium (176mmol) at -75°C, react for 4h, heat up to -3°C and add diphenylphosphine chloride (176mmol), react for 2h, react The solution was purified by column chromatography (height-to-diameter ratio: 2, residence time: 2 min), and the eluting phase was a mixed solvent of ethyl acetate and n-hexane at a ratio of 1:1. Ligand ...

Embodiment 3

[0105] Ligand (L3) differs from the preparation method in Example 1 in that:

[0106] 1) First, heat 2,6-dibromo-4-methylpyridine (105.5mmol) and tert-butylamine (263.8mmol) at 190°C for 8h, filter after cooling, add water (800ml) and dichloromethane (200ml ) extraction, remove dichloromethane under vacuum condition, the product obtained carries out column chromatography (height-diameter ratio is 2, and retention time is 2min purification), and eluting phase is the ethyl acetate and normal hexane that volume ratio is 1:1 The solvents were mixed and dried to obtain the product.

[0107] Dissolve the product in acetonitrile (80mmol) solvent, then add n-butyllithium (192mmol) at -70°C, react for 5h, heat up to 0°C, add diphenylphosphine chloride (192mmol), react for 3h, the reaction solution Purified by column chromatography (height-to-diameter ratio: 2, residence time: 2 min), the eluting phase was a mixed solvent of ethyl acetate and n-hexane at 1:1, and the ligand L3 was obta...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a ligand based on a pyridine structure and a preparation method thereof, and a supported catalyst based on the pyridine structure, a preparation method of the supported catalyst and application of the supported catalyst in ethylene oligomerization. A catalytic system comprises the ligand, a metal precursor with chromium as the center and silica gel. When the supported catalyst prepared from the ligand is used in ethylene oligomerization, the form of a polymer in ethylene oligomerization can be changed, so that the probability of blockage of a reaction kettle is greatly reduced, and continuous operation of a device is ensured.

Description

technical field [0001] The invention relates to the field of ethylene oligomerization catalysts, and relates to a ligand based on a pyridine structure and a preparation method thereof, a supported catalyst based on a pyridine structure, a preparation method and an application thereof in ethylene oligomerization. Background technique [0002] Linear α-olefin is an important commodity chemical intermediate, which can be used to produce plasticizers, additives, surfactants and lubricating oils, and more importantly, it can also be used to copolymerize with ethylene to form polymers. Linear α-olefins are important comonomers for the production of polymers with excellent properties and play an irreplaceable role in industrial production. For example, α-olefins are often added as comonomers in the industrial production of linear low-density polyethylene (LLDPE) and high-density polyethylene (HDPE), in which 1-hexene or 1-octene is copolymerized with ethylene to form a polymer It ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C07F9/58B01J31/24C07C2/36C07C11/02
CPCC07F9/58B01J31/2409C07C2/36C07C2531/24B01J2531/62B01J2531/0213B01J2231/20C07C11/02Y02P20/52
Inventor 陈冠良张彦雨刘帮明郭华陈海波
Owner WANHUA CHEM GRP
Features
  • Generate Ideas
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com