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Method for preparing difluoroacetic acid and salts thereof

A technology of difluoroacetic acid and difluoroacetyl fluoride, which is applied in the preparation of acyl halides, acyl halides, organic chemistry, etc., can solve problems such as difficult recycling, and achieve good productivity and cheap raw materials

Inactive Publication Date: 2011-02-16
RHODIA OPERATIONS SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Moreover, the acid obtained is in a sodium-containing form, which is difficult to recover from the reaction medium

Method used

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  • Method for preparing difluoroacetic acid and salts thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-9

[0070] The following examples show the effect of temperature, HF / CDCA ratio and residence time.

[0071] Table (I)

[0072]

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Abstract

The invention relates to a method for preparing difluoroacetic acid and the salts thereof. The invention also relates to the preparation of difluoroacetyl fluoride used as an intermediate product in the preparation of difluoroacetic acid. The method for preparing difluoroacetic acid according to the invention is characterised in that the same comprises the step of preparing difluoroacetyl fluoride by reacting dichloroacetyl chloride with hydrofluoric acid in a gaseous phase and in the presence of a chromium-based catalyst, followed by the step of hydrolysing the difluoroacetyl fluoride thus obtained.

Description

technical field [0001] The present invention relates to a method for preparing difluoroacetic acid and its salts. [0002] The invention also relates to the preparation of difluoroacetyl fluoride, which is used as an intermediate product in the production of difluoroacetic acid. [0003] More particularly, the present invention relates to a process for the gas phase preparation of difluoroacetyl fluoride. Background technique [0004] There are various ways of preparing difluoroacetic acid or its salts. [0005] In particular, it is known that by reacting potassium fluoride with a dichloroacetic acid derivative such as N,N-diethylchlorofluoroacetamide (Chemical Abstracts, 88 , (1), 6300m) or N-pyrrolidine-chlorofluoroacetamide (Chemical Abstracts, 108 , (19), 166949q) reaction to prepare difluoroacetic acid. [0006] A completely different way for obtaining difluoroacetic acid consists in the oxidation of difluoroethanol obtained by hydrolysis of 1-bromo-2,2-difluoroetha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C53/18C07C53/48C07C51/04C07C51/58
CPCC07C51/04C07C51/58C07C53/18C07C53/48
Inventor F·梅茨L·圣雅尔梅斯
Owner RHODIA OPERATIONS SAS
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