Purification method of heptafluoroisobutyramide
A technology of heptafluoroisobutyramide and purification method, which is applied in the field of high-purity heptafluorobutyramide, can solve the problem of affecting operation safety, affecting the process safety of heptafluoroisobutyronitrile and product quality, and there is no public literature report on heptafluoroisobutyramide Purification process and other issues to achieve the effect of high safety, simple and effective purification method, and easy recovery
Pending Publication Date: 2022-02-18
CHEM & CHEM ENG GUANGDONG LAB +1
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Problems solved by technology
The chemical raw material heptafluoroisobutyramide often contains ammonium fluoride. In the presence of dehydrating agents such as phosphorus pentoxide, ammonium fluoride will decompose hydrogen fluoride and ammonia during the high-temperature dehydration reaction of heptafluoroisobutyramide, making the reaction process Acid mist and dust are produced in the process, the acid mist can affect the operation safety, and the dust will enter the heptafluoroisobutyronitrile product, thereby seriously affecting the process safety and product quality of the synthetic heptafluoroisobutyronitrile
Up to now, there is no public literature reporting the purification process of heptafluoroisobutyramide
Method used
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Embodiment 1
[0022]At normal pressure of 1 standard atmosphere and room temperature of 25°C, the solubility of water (100 grams) to heptafluoroisobutyramide and ammonium fluoride was tested respectively, and the results are shown in Table 1.
Embodiment 2
[0024] At normal pressure of 1 standard atmosphere and room temperature of 25°C, the solubility of methanol (100 grams) to heptafluoroisobutyramide and ammonium fluoride was tested respectively, and the results are shown in Table 1.
Embodiment 3
[0026] At normal pressure of 1 standard atmosphere and room temperature of 25°C, the solubility of ethanol (100 grams) to heptafluoroisobutyramide and ammonium fluoride was tested respectively, and the results are shown in Table 1.
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The invention relates to a purification method of heptafluoroisobutyramide, and belongs to the field of chemical industry separation processes. The invention particularly relates to a method for obtaining high-purity heptafluorobutyramide by extracting a mixture of heptafluoroisobutyramide and ammonium fluoride through a single solvent or a mixed solvent. According to the invention, the purification method provided by the invention is simple, convenient and effective, heptafluoroisobutyramide can be purified until the purity is 98%, even 99% or above, and the content of ammonium fluoride is lower than 20ppm; particularly, a series of five-membered ring fluorides are used as a single solvent or form a mixed solvent with water, so that the extraction efficiency is high, and the five-membered ring fluorides are high in safety, non-flammable and non-explosive, are easy to recycle and are an ideal extracting solvent.
Description
technical field [0001] The invention relates to a method for purifying heptafluoroisobutyramide, in particular to a method for obtaining high-purity heptafluorobutyramide by extracting from a mixture of heptafluoroisobutyramide and ammonium fluoride through a single solvent or a mixed solvent. Background technique [0002] Heptafluoroisobutyramide is an important raw material for dehydration synthesis of heptafluoroisobutyronitrile. The chemical raw material heptafluoroisobutyramide often contains ammonium fluoride. In the presence of dehydrating agents such as phosphorus pentoxide, ammonium fluoride will decompose hydrogen fluoride and ammonia during the high-temperature dehydration reaction of heptafluoroisobutyramide, making the reaction process Acid mist and dust are produced in the process, the acid mist can affect the operation safety, and the dust will enter the heptafluoroisobutyronitrile product, thereby seriously affecting the process safety and product quality of ...
Claims
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Patent Timeline
Login to view more IPC IPC(8): C07C231/24C07C233/05
CPCC07C231/24C07C233/05
Inventor 张呈平冯仕为郭勤刘冬鹏权恒道
Owner CHEM & CHEM ENG GUANGDONG LAB
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