Preparation method of trifluoroacetonitrile

A technology of trifluoroacetonitrile and trifluoroacetamide, applied in the field of preparation of trifluoroacetonitrile

Inactive Publication Date: 2012-10-24
JIANGSU TETRA NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of this invention is to provide a kind of preparation method of important chemical intermediate trifluoroacetonitrile, this method has solved the problems such as heat trans

Method used

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  • Preparation method of trifluoroacetonitrile
  • Preparation method of trifluoroacetonitrile

Examples

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Embodiment 1

[0016] (1) Preheat polyphosphoric acid at 50°C to increase its fluidity;

[0017] (2) Add 100Kg trifluoroacetamide, 180Kg phosphorus pentoxide and 200L polyphosphoric acid to a 1000L gas reactor, and slowly raise the temperature to 145°C, and the gas produced immediately is trifluoroacetonitrile;

[0018] (3) Collect the product after cooling, the product purity is higher than 95%, and the yield is higher than 85%.

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Abstract

The invention relates to a preparation method of the trifluoroacetonitrile which is an important chemical intermediate with wide usages. The preparation method includes trifluoroacetamide serves as a raw material, a polyphosphoric acid is chosen as a solvent under the action of a dehydrating agent of phosphorus pentoxide, and the trifluoroacetonitrile is obtained through dehydration reaction. According to the preparation method of the trifluoroacetonitrile, problems of heat transmission and the like in solid-solid reaction are solved, the process is simplified and the cost is reduced by choosing an appropriate dehydrating agent, the resultant yield and the resultant purity are high, and the method is suitable for industrial production.

Description

technical field [0001] The invention relates to an important chemical intermediate trifluoroacetonitrile, in particular to a preparation method of trifluoroacetonitrile. Background technique [0002] Trifluoroacetonitrile, the molecular formula is C 2 f 3 N, the structural formula is . [0003] As an active electrophile, trifluoroacetonitrile is widely used in the synthesis of trifluoromethyl-containing heterocyclic compounds, and is an important chemical intermediate. With the continuous development of fluorine-containing pesticides and medicines, trifluoromethyl-containing The types of heterocyclic compounds are increasing day by day, and the demand is also gradually increasing, so trifluoroacetonitrile has a wide range of applications in pesticides and medicine. The research and development and production of trifluoroacetonitrile were carried out earlier in foreign countries, such as Daikin Corporation in Japan and Halocarbon Corporation in the United States. Howeve...

Claims

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Application Information

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IPC IPC(8): C07C255/10C07C253/20
Inventor 韩建伟常杨军曹祥来曹祥明
Owner JIANGSU TETRA NEW MATERIAL TECH
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