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Method for synthesizing hexafluoro-1,3-butadiene

A technology of butadiene and tetrafluoroethane, which is applied in the field of synthesizing hexafluoro-1,3-butadiene, can solve the problems of restricting the industrial production of hexafluorobutadiene, and achieve safe synthesis process, cheap raw materials and high product quality. Simple effect of separation and purification

Active Publication Date: 2015-08-12
泉州宇极新材料科技有限公司
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  • Abstract
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Problems solved by technology

These all limit the industrial production of hexafluorobutadiene

Method used

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  • Method for synthesizing hexafluoro-1,3-butadiene

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Experimental program
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Effect test

Embodiment 1

[0035] (1) 20ml of activated carbon catalyst [the purpose of activated carbon is to increase the reaction contact time, can also be considered as catalyst] into the fixed bed reactor, and the fixed bed reactor is heated with an open tube heating furnace. Under the protection of 50ml of nitrogen, the catalyst was first dried at a rate of 10 °C / min to 400 °C for 2 hours, and then dried at a rate of 10 °C / min to 600 °C for 2 hours. This completes the catalyst activation process.

[0036] Heat the reactor to 450°C, then, 30ml / min tetrafluoroethane and 30ml / min liquid bromine enter the mixing chamber together and mix well. After that, it goes through the reactor until the buffer bottle, water washing bottle, concentrated lye, and cooling collector. After the experiment, the product is mainly distributed in the cooling collector. The collected product was subjected to GC analysis. GC results showed that the collected product contained 27% dibromotetrafluoroethane and 18% monobrom...

Embodiment 2

[0040] (1) 20ml activated carbon catalyst is packed into a fixed-bed reactor, and the fixed-bed reactor is heated with an open-type tube heating furnace. Under the protection of 50ml of nitrogen, the catalyst was first dried at a rate of 10 °C / min to 400 °C for 2 hours, and then dried at a rate of 10 °C / min to 600 °C for 2 hours. This completes the catalyst activation process.

[0041] Heat the reactor to 550°C, then, 30ml / min tetrafluoroethane and 30ml / min liquid bromine enter the mixing chamber together and mix well. After that, it goes through the reactor until the buffer bottle, water washing bottle, concentrated lye, and cooling collector. After the experiment, the product is mainly distributed in the cooling collector. The collected product was subjected to GC analysis. GC results showed that the collected product contained 19% dibromotetrafluoroethane and 15% monobromotetrafluoroethane.

[0042] (2) In a 150ml three-neck flask, add 2.0g of activated zinc powder and ...

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Abstract

The invention relates to a method for synthesizing hexafluoro-1,3-butadiene, and belongs to the field of organic chemistry synthesis. The method comprises the following steps: carrying out gas phase bromination on tetrafluoroethane HFC-134a to generate dibromotetrafluoroethane CF3CBr2F, and carrying out a coupling reaction on dibromotetrafluoroethane, activated zinc powder and N,N-dimethyl formamide under the action of Fe<3+> to generate hexafluoro-1,3-butadiene. A solvent after the above reactions can be recycled. The method has the advantages of low price and convenient source of raw materials, high product yield, simple separation and purification of the above product, and easy industrial production.

Description

technical field [0001] The invention is a method for synthesizing hexafluoro-1,3-butadiene, and relates to a method for synthesizing hexafluoro-1,3-butadiene in an industrialized method. Background technique [0002] Hexafluoro-1,3-butadiene has high industrial value and is a widely used industrial raw material. Its downstream products can be used in precision electronic circuit board cleaning agents, pesticides and insecticides, and in fluorine-containing pharmaceutical intermediates It has high application value in the synthesis of fluorine-containing fine chemicals. In the synthesis of fluorine-containing polymers, it can be used as a polymer monomer to prepare polyhexafluorobutadiene, and it can also be used with other monomers to synthesize fluorine-containing rubber and resins with excellent electrical properties. The current experimental results show that hexafluoro-1,3-butadiene has great application potential in dry etching of VLSI circuits. [0003] At present, m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C17/269C07C21/20
CPCY02P20/582
Inventor 权恒道周彪周晓猛
Owner 泉州宇极新材料科技有限公司
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