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Method for preparing 1,2-dibromohexafluoropropane

A technology of dibromohexafluoropropane and hexafluoropropylene, which is applied in the field of 1, can solve the problems of unstable reaction, limited production capacity, and low yield, and achieve the effects of high yield, stable reaction, and environmentally friendly process

Active Publication Date: 2015-05-06
ZHEJIANG HUANXIN FLUORO MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at defects such as unstable reaction, low yield, unsafety and limited capacity in the prior art, and provides an efficient and safe preparation method for synthesizing 1,2-dibromohexafluoropropane in a solvent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] After the mixture of bromine 1.6kg and methanol 60ml was stirred, hexafluoropropylene was continuously fed, and the reaction temperature was 60°C. After 72 hours, the conversion rate of bromine was 20%, and the color of the reaction solution was still purple.

Embodiment 2

[0035] In the mixture of bromine 1.6kg (10mol) and methanol 40ml, add an appropriate amount of catalyst iron ion type perfluorosulfonic acid ion exchange resin, stir, continue to feed 1.35kg (9mol) of hexafluoropropylene for 20 minutes, and the reaction temperature is 25 ° C until The crude product was obtained until the color of the liquid phase changed to light red or colorless. After washing with water and distillation, 1,2-dibromohexafluoropropane is obtained, the purity is 99.95%, the conversion rate of bromine is 99.2%, the selectivity of 1,2-dibromohexafluoropropane is 99.8%, -bromohexafluoropropane not detected.

Embodiment 3

[0037] In the mixture of bromine 1.44kg (9mol) and methanol 40ml, add an appropriate amount of catalyst iron ion type perfluorosulfonic acid ion exchange resin, stir, continue to feed 1.5kg (10mol) of hexafluoropropylene for 20 minutes, and the reaction temperature is 25 ° C until The crude product was obtained until the color of the liquid phase changed to light red or colorless. After washing with water and distillation, 1,2-dibromohexafluoropropane is obtained, the purity is 99.95%, the conversion rate of bromine is 99.4%, the selectivity of 1,2-dibromohexafluoropropane is 99.8%, and -bromohexafluoropropane not detected.

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Abstract

The invention relates to a method for preparing 1,2-dibromohexafluoropropane. The method comprises the following steps: (1) adding a catalyst into a mixture of bromine and a polar solvent, wherein the catalyst is transition metal element cationoid perfluorosulfonic acid ion exchange resin; (2) introducing hexafluoropropylene into the solution till the color of the liquid phase is colorless from red to obtain a crude 1,2-dibromohexafluoropropane product; (3) washing and distilling the crude 1,2-dibromohexafluoropropane product obtained in the step (2) to obtain 1,2-dibromohexafluoropropane. The method is stable in reaction, easy in heat conduction control, safe and efficient, and high in yield.

Description

technical field [0001] The invention relates to a bromination method of perfluoroalkene, in particular to a preparation method of 1,2-dibromohexafluoropropane. Background technique [0002] Bromine-containing fluoroalkanes are important fine fluorine-containing chemicals. They play an important role in the construction of the national economy. Their applications cover various fields such as medicine, textile printing and dyeing, coatings and environmental protection. Its main uses are foaming agent, cleaning agent, fabric finishing agent, solvent and high-efficiency fire extinguishing agent, etc. [0003] The reaction of introducing halogen, such as chlorine or bromine, into fluorine-containing olefins is called halogenation reaction. The halogenation reaction is one of the most important unit reactions in the fluorine chemical industry. Existing enterprises generally adopt the reaction conditions of visible light or ultraviolet light, the reactivity of chlorine is high, a...

Claims

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Application Information

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IPC IPC(8): C07C19/14C07C17/04
Inventor 方海滔金坚勇吴志筐应永安杨新华王志强陈伟谢福钦
Owner ZHEJIANG HUANXIN FLUORO MATERIAL
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