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A method for preparing perfluoro-2-methyl-2-pentene

A technology of methyl and pentene, which is 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 effect of fast reaction speed, good safety, and no need for high temperature and high pressure

Active Publication Date: 2016-01-27
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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  • A method for preparing perfluoro-2-methyl-2-pentene

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Effect test

Embodiment 1

[0023] In a 500mL three-neck flask equipped with a reflux condenser and a mechanical stirring device, add 100mL of perfluoro-4-methyl-2-pentene, 1.05g of sodium fluoride, 6.6g of 18-crown-6, and 100mL of Diethylene glycol dimethyl ether. After turning on 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 500mL three-neck flask equipped with a reflux condenser and a mechanical stirring device, add 100mL of perfluoro-4-methyl-2-pentene, 1.45g of potassium fluoride, 6.6g of 18-crown-6, and 100mL of Diethylene glycol dimethyl ether. After turning on 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 500mL three-necked flask equipped with a reflux condenser and a mechanical stirring device, add 100mL of perfluoro-4-methyl-2-pentene, 3.8g of cesium fluoride, 6.6g of 18-crown-6, and 100mL of Diethylene glycol dimethyl ether. After turning on 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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Abstract

The invention discloses a preparation method of perfluoro-2-methyl-2-pentene, which uses perfluoro-4-methyl-2-pentene as a raw material to prepare through catalytic isomerization reaction, and has the advantages of simple operation, high reaction Fast speed, good safety and so on. The prepared perfluoro-2-methyl-2-pentene can be used to synthesize 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) the gas phase oligomerization method that introduces is to be raw material with hexafluoro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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