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Synthesis technology of 1-bromine 2,2-polyvinylidene floride

A technology for the synthesis of ethylene difluoride, which is applied in the field of 1-bromine 2, can solve the problems of difficult industrial scale implementation, high cost, and difficult acquisition of raw materials, and achieve the effects of easy industrial production, low cost, and easy availability

Inactive Publication Date: 2016-08-03
NANTONG BAOKAI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (i) The raw materials used are difficult to obtain and the cost is relatively high;
[0006] (ii) It will generate a large amount of zinc bromide industrial waste, which is difficult to implement on an industrial scale

Method used

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  • Synthesis technology of 1-bromine 2,2-polyvinylidene floride

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Experimental program
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Effect test

specific Embodiment 1

[0024] like figure 1 Shown, a kind of 1-bromo 2, the synthetic technique of 2-difluoroethylene, comprises the steps:

[0025] The first step, bromination reaction: use vinylidene fluoride as raw material and bromine for bromination addition reaction to generate dibromodifluoroethane; adopt batch process, bromine is metered and then sucked into the bromination reaction kettle by vacuum. Stirring was started, vinylidene fluoride gas was slowly introduced, and the temperature of the kettle was kept at 10°C. After 3 hours of reaction, the reaction was completed.

[0026] The second step, elimination reaction: the dibromodifluoroethane generated above is irradiated by infrared light in the presence of a catalyst, and alkali is added to eliminate hydrogen bromide to generate 1-bromo-2,2-difluoroethylene; Process, the product of the first step is measured and pumped into the reaction kettle, an appropriate amount of catalyst is added, stirring is started, and 10% lye is slowly added...

specific Embodiment 2

[0030] like figure 1 Shown, a kind of 1-bromo 2, the synthetic technique of 2-difluoroethylene, comprises the steps:

[0031] The first step, bromination reaction: use vinylidene fluoride as raw material and bromine for bromination addition reaction to generate dibromodifluoroethane; adopt batch process, bromine is metered and then sucked into the bromination reaction kettle by vacuum. Stirring was started, vinylidene fluoride gas was slowly introduced, and the temperature of the kettle was kept at 80°C. After 12 hours of reaction, the reaction was completed.

[0032] The second step, elimination reaction: the dibromodifluoroethane generated above is irradiated by infrared light in the presence of a catalyst, and alkali is added to eliminate hydrogen bromide to generate 1-bromo-2,2-difluoroethylene; The first step product is measured and pumped into the reaction kettle, an appropriate amount of catalyst is added, stirring is started, and 40% lye is slowly added dropwise, and ...

specific Embodiment 3

[0036] like figure 1 Shown, a kind of 1-bromo 2, the synthetic technique of 2-difluoroethylene, comprises the steps:

[0037] The first step, bromination reaction: use vinylidene fluoride as raw material and bromine for bromination addition reaction to generate dibromodifluoroethane; adopt batch process, bromine is metered and then sucked into the bromination reaction kettle by vacuum. Stirring was started, and vinylidene fluoride gas was slowly introduced, and the temperature of the kettle was kept at 60° C. After 8 hours of reaction, the reaction was completed.

[0038] The second step, elimination reaction: the dibromodifluoroethane generated above is irradiated by infrared light in the presence of a catalyst, and alkali is added to eliminate hydrogen bromide to generate 1-bromo-2,2-difluoroethylene; Process, the first step product is measured and pumped into the reaction kettle, an appropriate amount of catalyst is added, stirring is started, 30% lye is slowly added dropw...

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Abstract

The invention discloses a synthesis process of 1-bromo-2,2-difluoroethylene, comprising the following steps: the first step, bromination reaction: using vinylidene fluoride as a raw material and bromine to perform bromination addition reaction to generate dibromo Difluoroethane; second step, elimination reaction: the dibromodifluoroethane generated above is irradiated by infrared light in the presence of a catalyst, and alkali is added to eliminate hydrogen bromide to generate 1-bromine 2,2-di Vinyl fluoride. The yield of the process of the invention reaches ≥ 90%, and the product purity ≥ 99.5%.

Description

technical field [0001] The invention belongs to the field of chemical synthesis, and in particular relates to a synthesis process of 1-bromo-2,2-difluoroethylene. Background technique [0002] 1-Bromo-2,2-difluoroethylene is an important intermediate of fluorine-containing compounds and the third monomer of fluorine-containing polymers. It can be used as an intermediate of various fluorine-containing fine chemicals for the synthesis of fluorine-containing medicines ; It can be used as the third monomer of fluoropolymers to improve the vulcanization method and performance of fluoroelastomers, improve the melt processing performance of fluoropolymers and produce special properties. [0003] The prior art proposes many methods for the preparation of 1-bromo-2,2-difluoroethylene. For example, Davis et al. of The Dow Chemical Company, in US Pat. No. 3,505,416, 1970, describe a process for the preparation of 1-bromo-2,2-difluoroethylene. It uses tetrabromodifluoroethane as a raw...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C17/04C07C19/14C07C17/25C07C21/18
CPCC07C17/04C07C17/25
Inventor 闫宗刚李华新黄凯华周佳欢
Owner NANTONG BAOKAI CHEM
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