Method for preparing N-vinyl imidazole

A technology of vinylimidazole and chloroethylimidazole, which is applied in the field of preparation of N-vinylimidazole, and achieves the effects of good product quality, low production cost and high yield

Inactive Publication Date: 2012-03-21
YANCHENG KANGLEYU NEW MATERIAL TECH
View PDF2 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no research report on the preparation method of N-vinylimidazole at home and abroad

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Add 34.0g of imidazole, 28.0g of potassium hydroxide, 34.5g of potassium carbonate, and 50.0g of deionized water into a 500mL three-necked flask equipped with a thermometer and an electric stirrer, heat up, stir, and keep the reaction temperature at 60°C 1.5h, stop heating and stirring; the solution after the reaction is slowly added dropwise to a 1000mL four-necked flask equipped with a reflux condenser, a gas absorber, a thermometer and an electric stirrer (24.8g of dichloroethane and 11.5g of anhydrous ethanol), slowly heating up, stirring, the reaction temperature is 60°C, and after maintaining the reaction temperature for 1.0h, continue to heat up to 70°C, maintain the reaction temperature for 2.0h, stop heating, and continue stirring; after the temperature drops to 40°C, Slowly add 14.0g of potassium hydroxide (2 times, 7.0g each time) into the four-neck flask, continue to heat slowly to 80°C, keep the reaction temperature for 2.0h, stop heating and stirring, after...

Embodiment 2

[0014] Add 34.0g of imidazole, 32.0g of potassium hydroxide, 14.5g of potassium carbonate and 23.8g of potassium bicarbonate, and 50.0g of deionized water into a 500mL three-necked flask equipped with a thermometer and an electric stirrer, heat up, stir, and the reaction temperature is 50°C , and keep the reaction temperature for 1.5h, stop heating and stirring; the solution after the reaction is slowly added dropwise to a 1000mL four-necked flask equipped with a reflux condenser, a gas absorber, a thermometer and an electric stirrer (24.8g of dichloroethylene Alkanes and 11.5g absolute ethanol), slowly heat up, stir, the reaction temperature is 100°C, and keep the reaction temperature for 1.0h, then continue to heat up to 70°C, keep the reaction temperature for 2.0h, stop heating, continue to stir; After reaching 40°C, slowly add 21.0g of potassium hydroxide to the four-neck flask (into 2 times, 7.0g each time), continue to slowly heat up to 65°C, keep the reaction temperature...

Embodiment 3

[0016] Add 34.0g of imidazole, 30.8g of sodium hydroxide, 37.1g of sodium carbonate, and 50.0g of deionized water into a 500mL three-neck flask equipped with a thermometer and an electric stirrer, heat up, stir, and keep the reaction temperature at 70°C 1.5h, stop heating and stirring; the solution after the reaction is slowly added dropwise to a 1000mL four-necked flask equipped with a reflux condenser, a gas absorber, a thermometer and an electric stirrer (34.8g of dichloroethane and 21.5g of n-propane alcohol), slowly warming up, stirring, the reaction temperature is 70°C, and after maintaining the reaction temperature for 1.0h, continue to heat up to 80°C, maintain the reaction temperature for 2.0h, stop heating, and continue stirring; after the temperature drops to 40°C, Slowly add 20.0g of sodium hydroxide into the four-necked flask (adding in four times, 5.0g each time), continue to heat slowly to 85°C, keep the reaction temperature for 2.0h, stop heating and stirring, a...

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 relates to a method for preparing N-vinyl imidazole, comprising the steps of: carrying out substitution reaction on imidazole and first alkali metal hydroxide at a temperature of 50-90 DEG C in deionized water under the existence of an acid binding agent so as to generate imidazole alkali metal salt; adding the generated alkali metal salt into solution of dichloroethane and alcohol; carrying out the substitution reaction at a temperature of 60-100 DEG C so as to generate chloroethane imidazole; finally adding second alkali metal hydroxide into the chloroethane imidazole and carrying out elimination reaction at a temperature of 65-95 DEG C; after the reaction is finished, filtering and removing the alkali metal salt; reducing pressure and distilling out water, unreacted dichloroethane and alcohol at a temperature of 80-90 DEG C; and continuing raising the temperature to 100-110 DEG C and carrying out reduced pressure distillation so as to obtain the N-vinyl imidazole. The method provided by the invention has the advantages of little environmental pollution, low production cost, good product quality and high yield.

Description

technical field [0001] The invention belongs to a preparation method of N-vinylimidazole. Background technique [0002] N-vinylimidazole is a very important imidazole derivative and an important fine chemical raw material. It is mainly used in the synthesis of medicines and pesticides and as a curing agent for epoxy resins. It can also be used to prepare vinylimidazole ionic liquids. It is easy to polymerize into a plastic rubber polymer. It is used as a hardener for resin materials, as the nucleus of photosensitive chemical reagent resin inclusions, and also used in the petroleum industry and as a high polymer. With the continuous upgrading of my country's industrial technology, the demand for N-vinylimidazole will increase day by day, so the preparation of N-vinylimidazole has great economic value and social significance. At present, there is no research report on the preparation method of N-vinylimidazole at home and abroad. Contents of the invention [0003] The purp...

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 Applications(China)
IPC IPC(8): C07D233/58
Inventor 丁建飞沈健
Owner YANCHENG KANGLEYU NEW MATERIAL TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap