Unlock instant, AI-driven research and patent intelligence for your innovation.

A method for highly active and selective propylene dimerization

A high-selectivity, high-activity technology, applied in chemical instruments and methods, physical/chemical process catalysts, organic compounds/hydrides/coordination complex catalysts, etc., can solve the problem of insufficient dimerization selectivity and process equipment requirements High dimerization selectivity, high dimerization selectivity, high dimerization selectivity, high catalytic activity, avoiding the effect of operation

Active Publication Date: 2019-06-04
EAST CHINA UNIV OF SCI & TECH
View PDF8 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] It can be seen from the above that in the prior art, alkali metal catalysts such as sodium and potassium are used to catalyze the dimerization of propylene. The dimerization selectivity is high, but the use of active metals requires high process equipment and high production risk.
However, the methods catalyzed by transition metal catalysts generally have the problem that the dimerization selectivity is not high enough or the catalytic activity is low.

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
  • A method for highly active and selective propylene dimerization
  • A method for highly active and selective propylene dimerization
  • A method for highly active and selective propylene dimerization

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0040] Among the present invention, the preparation method of ethylene bridging shown in formula (I) replaces diindene titanium group metal complex catalyst, comprises the steps:

[0041] (1) The ethylene bridging substituted bisindene ligand compound represented by formula (II) is reacted with an alkyl alkali metal compound in an organic medium, the reaction temperature is -78 to 50°C, and the reaction time is 2 to 96 hours , generating the dialkali metal salt of ethylene bridged substituted bisindene ligand;

[0042] R described in formula (II) 1 ~R 6 Consistent with each R group in formula (I);

[0043] The alkyl alkali metal compound is selected from C 1 ~C 4 Alkylithium;

[0044] The molar ratio of the ethylene bridging substituted diindene ligand compound represented by the formula (II) to the alkyl alkali metal compound is 1:2 to 2.5;

[0045] (2) Optionally, the dialkali metal salt of the ethylene bridged substituted bisindene ligand of step (1) is mixed with ZrC...

Embodiment 1

[0057] Preparation of ethylene bridged substituted diindene zirconium complex catalyst meso-C1

[0058] (1) Preparation of 6-methyl-1,2,3,5-tetrahydrodicyclopentadiene acene

[0059] Under argon protection, add AlCl to a 250mL three-neck flask 3 (110mmol, 14.61g), then added 130mL dichloromethane and stirred evenly, at -78°C, added dropwise the dichloromethane (100mmol, 11.82g) and 2-methyl-3-chloropropionyl chloride (100mmol, 12.82g) Chloromethane solution, react for 24 hours, slowly add the reaction solution to dilute hydrochloric acid to terminate the reaction, wash with saturated aqueous sodium carbonate solution, water, saturated aqueous sodium chloride solution, and then extract with 100mL dichloromethane, combine the organic phases, anhydrous magnesium sulfate Dry for 2h. Suction filtration, rotary evaporation, and vacuum drying yielded 21.24 g of a white solid with a yield of 95.4%.

[0060] Slowly add the above solid into about 100mL of concentrated sulfuric acid, ...

Embodiment 2

[0075] Preparation of ethylene bridged substituted diindene zirconium and hafnium complex catalysts rac-C2, meso-C2, rac-C3, meso-C3

[0076] (1) Preparation of 4,7-dimethylindene

[0077] Under the protection of argon, press sodium filament (426mmol, 9.8g) into the three-necked flask, slowly add about 100mL dry methanol, and after the sodium filament disappears, add fresh cyclopentadiene (260mmol, 21.2mL) and 2,5 -Hexanedione (170mmol, 26.5mL), react with bubbling and stirring for 24h. The reaction was quenched by adding 50 mL of water. After the methanol solvent was removed by rotary evaporation, the pH was adjusted to neutral with dilute hydrochloric acid, and the liquids were separated. The aqueous phase was extracted three times with 200mL petroleum ether, and the organic phases were combined, dried over anhydrous magnesium sulfate, filtered, and the solvent was removed by rotary evaporation to obtain a dark brown liquid. It was distilled under reduced pressure, and the...

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 dimerization method for high activity and selectivity propylene. The method includes the following steps that methylaluminoxane (MAO) or modified methylaluminoxane (MMAO) is used as a catalyst promoter, and the propylene is subjected to a dimerization reaction under the catalytic action of an ethylidene bridged substituted diindene titanium group metal complex catalyst; and the ethylidene bridged substituted diindene titanium group metal complex catalyst is an internal compensation (meso-) ethylidene bridged substituted diindene titanium group metal complex catalyst or a racemization (rac-) ethylidene bridged substituted diindene titanium group metal complex catalyst. Compared with the prior art, the dimerization method provided by the invention is high in catalytic activity and high in dimerization selectivity, the rate can reach 99%, numerous follow-up operation steps in separation of products with the high degree of polymerization are omitted, the industrialization cost is reduced, and the industrial production needs can be met.

Description

technical field [0001] The invention relates to a method for propylene dimerization with high activity and high selectivity. The method adopts ethylene bridging to replace diindene titanium group metal complex catalyst with high activity and selectivity to catalyze propylene dimerization. Background technique [0002] Propylene dimerization can produce various five-carbon to seven-carbon higher olefin products, such as 1-pentene, 4-methyl-1-pentene, 2-methyl-1-pentene, 4-methyl-2-pentene ene etc. These dimerization products can not only participate in polymerization or copolymerization as monomers to obtain high-performance polymers, but also have uses as precursors of detergents, artificial oils and plasticizers. [0003] Initially, the dimerization reaction of propylene is mainly catalyzed by a solid catalyst prepared by loading alkali metals such as sodium and potassium on potassium carbonate or graphite under high temperature and high pressure. In 1966, G. Wilke et al....

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
Patent Type & Authority Patents(China)
IPC IPC(8): C07C11/113C07C11/10C07C11/02C07C2/34B01J31/22
CPCY02P20/52
Inventor 马海燕李波王函黄吉玲
Owner EAST CHINA UNIV OF SCI & TECH
Features
  • R&D
  • 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