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Synthetic method of perfluoroisobutyronitrile

A technique for the synthesis of perfluoroisobutyronitrile, which is applied in the field of synthesis of perfluoroisobutyronitrile, can solve problems such as long routes, environmental pollution, and increased production costs, and achieve simple and safe processes, easy industrial production, and high reaction conversion rates and the effect of high yield

Pending Publication Date: 2020-10-30
福建省漳平市九鼎氟化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this technical route is mature and reliable, there is a long route, and the involved chemicals such as dehydrating agents lead to increased production costs and environmental pollution issues related to emissions, etc.

Method used

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  • Synthetic method of perfluoroisobutyronitrile
  • Synthetic method of perfluoroisobutyronitrile
  • Synthetic method of perfluoroisobutyronitrile

Examples

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Embodiment 1

[0063] A kind of synthetic method of the perfluoroisobutyronitrile of the embodiment of the present invention, its synthetic scheme is as follows figure 1 Shown, this synthesis method comprises the following steps:

[0064] (1) Synthesis of perfluoroepoxy isobutane

[0065] First, the reaction system was heated and vacuumed to remove water, and the whole system was purged with high-purity nitrogen to remove oxygen therein; the reactor was cooled to -30°C, and hexafluoroacetone (HFA) (166g, 1mol) was metered into the reactor, Control the ventilation rate to completely liquefy the HFA; then meter in hexafluoropropylene oxide (HFPO) (166.02g, 1mol), control the ventilation rate to completely liquefy the HFPO; close the inlet valve, and raise the temperature in the kettle to 190°C for 8 hours After the reaction, the product washes the column by saturated sodium fluoride solution to obtain a mixture containing perfluoroisobutylene oxide and perfluoropropylene oxide, and distillat...

Embodiment 2

[0075] A kind of synthetic method of the perfluoroisobutyronitrile of the embodiment of the present invention, its synthetic scheme is as follows figure 2 Shown, this synthesis method comprises the following steps:

[0076] (1) Synthesis of perfluoroepoxy isobutane

[0077] First, the reaction system was heated and vacuumed to remove water, and the whole system was purged with high-purity nitrogen to remove oxygen therein; the reactor was cooled to -30°C, and hexafluoroacetone (HFA) (166g, 1mol) was metered into the reactor, Control the ventilation rate to completely liquefy the HFA; then meter in hexafluoropropylene oxide (HFPO) (166.02g, 1mol), control the ventilation rate to completely liquefy the HFPO; close the inlet valve, and raise the temperature in the kettle to 190°C for 8 hours After the reaction, the product passes through the saturated aqueous sodium fluoride washing column to obtain a mixture containing perfluoroisobutylene oxide and perfluoropropylene oxide; d...

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Abstract

The invention discloses a synthetic method of perfluoroisobutyronitrile. The synthetic method comprises the following steps of: (1) taking hexafluoropropylene oxide and hexafluoroacetone as raw materials to react to prepare perfluoroepoxyisobutane; (2) carrying out catalytic isomerization on the perfluoroepoxyisobutane to obtain heptafluoroisobutyryl fluoride; (3) carrying out esterification reaction on heptafluoroisobutyryl fluoride and alcohol to obtain heptafluoroisobutyrate; and (4) reacting heptafluoroisobutyrate with ammonia, and performing dehydrating to obtain perfluoroisobutyronitrile. The synthesis method has the advantages of easily available raw materials, low raw material cost, few byproduct, mild reaction conditions, high reaction conversion rate and yield, short synthesis route, simple and safe process and easy industrial production.

Description

technical field [0001] The invention relates to the technical field of organic synthesis, in particular to a method for synthesizing perfluoroisobutyronitrile. Background technique [0002] Heptafluoroisobutyronitrile (perfluoroisobutyronitrile), namely 2,3,3,3-tetrafluoro-2-trifluoromethylpropionitrile, is a class of perfluoronitrile compounds with a boiling point of -4.7°C. It is a colorless gas at normal temperature and pressure. It has the characteristics of low boiling point, high volatility, excellent electrical insulation properties and good environmental protection performance, and can be used as a gas dielectric material and a dielectric composition for insulators in electrical devices. The greenhouse effect index (GWP) of heptafluoroisobutyronitrile is only 2210, which is much lower than that of sulfur hexafluoride (GWP=23500). It can be used to replace the traditional sulfur hexafluoride insulating gas and greatly reduce the problem of atmospheric greenhouse effe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C253/20C07C255/10C07C231/02C07C233/05C07C67/14C07C69/63C07C51/58C07C53/50C07D303/08
CPCC07C253/20C07C231/02C07C67/14C07C51/58C07D303/08C07C53/50C07C69/63C07C233/05C07C255/10
Inventor 周济苍喻强廖敏周遇吉喻鼎辉
Owner 福建省漳平市九鼎氟化工有限公司
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