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
View PDF5 Cites 9 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
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
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
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]
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more PUM
Login to view more 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
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more Application Information
Patent Timeline
Login to view more 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
Who we serve
- R&D Engineer
- R&D Manager
- IP Professional
Why Eureka
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Social media
Try Eureka
Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap