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Perfluoro-2-methyl-2-pentene preparation method

A technology of methyl and pentene, applied in the preparation of halogenated hydrocarbons, chemical instruments and methods, organic chemistry, etc., can solve the problems of high temperature and high pressure reaction time, etc., and achieve the effects of fast reaction speed, good safety and easy operation.

Active Publication Date: 2014-01-01
SINOCHEM LANTIAN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] What the present invention aims to solve is the problem of high temperature and high pressure or long reaction time in the existing perfluoro-2-methyl-2-pentene preparation method, and provides a simple and easy perfluoro-2-methyl-2-pentene with low equipment requirements Preparation method of base-2-pentene

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] In a 500 mL three-neck flask equipped with a reflux condenser and a mechanical stirring device, add 100 mL of perfluoro-4-methyl-2-pentene, 1.05 g of sodium fluoride, and 6.6 g of 18-crown-6 , 100 mL of diglyme. After starting the stirring, the temperature was raised to 40 °C. After reacting for 3 hours, the reaction product was analyzed by gas chromatography. The product was perfluoro-2-methyl-2-pentene, and the conversion rate was 45.1% based on perfluoro-4-methyl-2-pentene.

Embodiment 2

[0025] In a 500 mL three-necked flask equipped with a reflux condenser and a mechanical stirring device, add 100 mL of perfluoro-4-methyl-2-pentene, 1.45 g of potassium fluoride, and 6.6 g of 18-crown-6 , 100 mL of diglyme. After starting the stirring, the temperature was raised to 40 °C. After reacting for 3 hours, the reaction product was analyzed by gas chromatography. The product was perfluoro-2-methyl-2-pentene, and the conversion rate was 81.8% based on perfluoro-4-methyl-2-pentene.

Embodiment 3

[0027] In a 500 mL three-neck flask equipped with a reflux condenser and a mechanical stirring device, add 100 mL of perfluoro-4-methyl-2-pentene, 3.8 g of cesium fluoride, and 6.6 g of 18-crown-6 , 100 mL of diglyme. After starting the stirring, the temperature was raised to 40 °C. After reacting for 3 hours, the reaction product was analyzed by gas chromatography. The product was perfluoro-2-methyl-2-pentene, and the conversion rate was 85.0% based on perfluoro-4-methyl-2-pentene.

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PUM

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Abstract

The invention discloses a perfluoro-2-methyl-2-pentene preparation method. The method allows perfluoro-2-methyl-2-pentene to be prepared through a catalytic isomerization reaction of a raw material perfluoro-4-methyl-2-pentene, and has the characteristics of simple operation, fast reaction speed, good safety and the like. The prepared perfluoro-2-methyl-2-pentene can be used for synthesizing surfactants, fabric treatment agents, paper treatment agents and the like.

Description

technical field [0001] The present invention relates to a method for preparing perfluoro-2-methyl-2-pentene. Background technique [0002] Perfluoro-2-methyl-2-pentene is an important fluorine-containing intermediate, which can be used in the synthesis of surfactants, fabric treatment agents, paper treatment agents, etc., and can also be used as a product to replace chlorofluorocarbons in electronic components Refrigerant, fire extinguishing agent, foam blowing agent and heat transfer agent, etc. . [0003] There are two main production methods of perfluoro-2-methyl-2-pentene, namely oligomerization of hexafluoropropylene, or isomerization of perfluoro-4-methyl-2-pentene as raw material . The oligomerization method is divided into a gas phase oligomerization method and a liquid phase oligomerization method. Patent US4377717, patent US4296265 and document J. Org. Chem., 30, 3524 (1965) introduce gas phase oligomerization method is to be raw material with hexafluoropropyle...

Claims

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Application Information

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IPC IPC(8): C07C17/358C07C21/18
Inventor 白占旗倪航张建君方小青柳彩波
Owner SINOCHEM LANTIAN
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