Method using phase-transfer catalysis to prepare trifluorobromoethylene

A technology of trifluoroethylene bromide and phase transfer catalyst, which is applied in the fields of dehydrohalogenation preparation, organic chemistry, etc., can solve the problems of poor mass transfer effect, low efficiency, long reaction time, etc., so as to improve production efficiency, speed up reaction rate, The effect of reducing production costs

Active Publication Date: 2017-08-11
ZHEJIANG LANTIAN ENVIRONMENTAL PROTECTION HI TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the traditional lye dehydrobromination process, since the raw material 1,2-dibromo-1,1,2-trifluoroethane is insoluble in lye, there are problems such as poor mass transfer effect, long reaction time, and low efficiency.

Method used

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  • Method using phase-transfer catalysis to prepare trifluorobromoethylene
  • Method using phase-transfer catalysis to prepare trifluorobromoethylene
  • Method using phase-transfer catalysis to prepare trifluorobromoethylene

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Put a 250ml three-necked flask in an oil bath, and install 1# cold hydrazine on the three-necked flask for reflux of unreacted raw materials. The collection, the temperature of 2# cold hydrazine is -20 ℃. Add 69g of 30% KOH and 0.9g of dodecyltrimethylammonium chloride into the three-necked flask, and put 60g of raw material 1,2-dibromo-1,1,2-trifluoroethane into the constant pressure funnel (NaOH:CF 2 BrCHFBr=1.5:1 molar ratio). When the temperature of the oil bath was raised to 70°C, the raw material CF was added dropwise to the three-necked flask while stirring. 2 BrCHFBr, continue to keep warm for 5h after the dropwise addition is completed. The reaction results are shown in Table 1.

Embodiment 2

[0035] Put a 250ml three-necked flask in an oil bath, and install 1# cold hydrazine on the three-necked flask for reflux of unreacted raw materials. The collection, the temperature of 2# cold hydrazine is -20 ℃. Add 69g of 30% KOH and 0.9g of dodecyltrimethylammonium chloride into the three-necked flask, and put 60g of raw material 1,2-dibromo-1,1,2-trifluoroethane into the constant pressure funnel (NaOH:CF 2 BrCHFBr=1.5:1 molar ratio). When the temperature of the oil bath was raised to 70°C, the raw material CF was added dropwise to the three-necked flask while stirring. 2 BrCHFBr, continue to keep warm for 4h after the dropwise addition is completed. The reaction results are shown in Table 1.

Embodiment 3

[0037] Put a 250ml three-necked flask in an oil bath, and install 1# cold hydrazine on the three-necked flask for reflux of unreacted raw materials. The collection, the temperature of 2# cold hydrazine is -20 ℃. Add 69g of 30% KOH and 0.9g of dodecyltrimethylammonium chloride into the three-necked flask, and put 60g of raw material 1,2-dibromo-1,1,2-trifluoroethane into the constant pressure funnel (NaOH:CF 2 BrCHFBr=1.5:1 molar ratio). When the temperature of the oil bath was raised to 70°C, the raw material CF was added dropwise to the three-necked flask while stirring. 2 BrCHFBr, continue to keep warm for 3h after the dropwise addition is completed. The reaction results are shown in Table 1.

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Abstract

The invention discloses a method for preparing trifluorobromoethylene. The method includes: allowing 1, 2-dibromo-1, 1, 2-trifluoroethane to have dehydrobromination reaction in an alkaline solution under the effect of a phase-transfer catalyst to generate the trifluorobromoethylene. The method is fast in reaction, high in synthesizing efficiency, low in cost, green and environmentally friendly.

Description

technical field [0001] The invention relates to a preparation method of bromotrifluoroethylene, in particular to a method for preparing bromotrifluoroethylene by phase transfer catalysis. Background technique [0002] Bromotrifluoroethylene has the properties of fluorine-containing olefins, including halogenation, hydrogenation, and nucleophilic reactions. It is mainly used in polymerization reactions and can also be used as chemical intermediates. Its metal-organic intermediate is an important reagent for the synthesis of trifluorovinyl compounds, such as trifluorostyrene, the raw material for the ion exchange membrane of the sub-battery of the synthetic fuel, or the synthesis of the green etching gas hexafluorobutadiene with excellent etching performance and low GWP value Wait. Bromotrifluoroethylene telomer can be used as floating and damping fluids for liquid floating gyroscopes and accelerometers in high-precision navigation systems. These liquids are expensive and wid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C17/25C07C21/18
CPCC07C17/25C07C21/18
Inventor 刘武灿石能富金佳敏
Owner ZHEJIANG LANTIAN ENVIRONMENTAL PROTECTION HI TECH
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