Preparation method for hexafluoro-2-butyne

A technology of butyne and hydrogen fluoride, which is applied in the field of preparation of hexafluoro-2-butyne, can solve complex problems such as hexafluoro-2-butyne, and achieve a mild and controllable reaction process, high yield, and short reaction route Effect

Inactive Publication Date: 2019-12-31
GUANGDONG POWER GRID CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, the present invention provides a method for preparing hexafluoro-2-butyne, whic

Method used

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  • Preparation method for hexafluoro-2-butyne

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Embodiment 1

[0030] The liquid phase fluorination of hexachloro-2-butyne was carried out in the presence of antimony pentafluoride. Add 50.0kg of acetonitrile, 0.5kg of antimony pentafluoride, 52.0kg of hexachloro-2-butyne and 4kg of anhydrous HF , after the addition, the temperature was raised to 100°C while stirring, and after 5 hours of reaction, the sample was processed and analyzed by gas chromatography. The content of hexafluoro-2-butyne in the system was 97.5%, and the content of hexachloro-2-butyne was 1.1% %.

Embodiment 2

[0032] The liquid phase fluorination of hexachloro-2-butyne was carried out in the presence of tin pentafluoride. Add 50.0kg benzonitrile, 0.5kg tin pentafluoride, 52.0kg hexachloro-2-butyne and 4kg anhydrous After the addition of water HF, raise the temperature to 110°C while stirring. After reacting for 8 hours, take a sample and perform gas chromatography analysis. The content of hexafluoro-2-butyne in the system is 94.8%, and hexachloro-2-butyne Content 4.7%.

Embodiment 3

[0034] The liquid phase fluorination of hexachloro-2-butyne was carried out in the presence of titanium tetrafluoride. Add 50.0kg of phenylacetonitrile, 0.5kg of titanium pentafluoride, 52.0kg of hexachloro-2-butyne and 4kg of non- After the addition of water HF, raise the temperature to 120°C while stirring. After reacting for 3 hours, take a sample and perform gas chromatography analysis. The content of hexafluoro-2-butyne in the system is 98.1%, and hexachloro-2-butyne Content 1.2%.

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Abstract

The invention belongs to the technical field of chemical engineering, and particularly relates to a preparation method for hexafluoro-2-butyne. The preparation method for the hexafluoro-2-butyne provided by the invention comprises the following step: performing a reaction on hexachloro-2-butyne and hydrogen fluoride under the conditions of a catalyst and a solvent to obtain the hexafluoro-2-butyne. According to the method, the hexachloro-2-butyne is used as a starting material, the hydrogen fluoride is used as a fluorinating reagent, and the hexafluoro-2-butyne is prepared in one step by fluorine-chlorine exchange. The preparation method provided by the invention has the advantages of a short reaction route, a high yield, basically no three waste (waste water, waste gas and solid waste), and a mild and controllable reaction process, and is suitable for industrial scale-up production.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, in particular to a preparation method of hexafluoro-2-butyne. Background technique [0002] Hexafluoro-2-butyne is an important fluorine-containing compound, which can be used as an intermediate or precursor in the field of fluorine-containing fine products to prepare a series of fluorine-containing pharmaceutical and pesticide intermediates. At the same time, due to the special structure of hexafluoro-2-butyne, a fluorine-containing alkyne, it has a certain insulating ability, and can be used as a fluorine-containing working fluid in the field of electrical insulation. [0003] Hexafluoro-2-butyne is a gas at room temperature, with a boiling point of -27.4°C. It can be liquefied under pressure and stored stably without the risk of self-polymerization, and has good material compatibility, which also gives Its application brings convenience and has a good application prospect. [0004]...

Claims

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Application Information

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IPC IPC(8): C07C17/20C07C21/22
CPCC07C17/206C07C21/22
Inventor 李丽唐念樊小鹏周永言邹庄磊张曼君黎晓淀
Owner GUANGDONG POWER GRID CO LTD
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