Solventless process for making 2,6 difluorobenzonitrile
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United States of America Patent
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Mar 26, 1996
Grant Date -
N/A
app pub date -
Dec 28, 1994
filing date -
Dec 28, 1994
priority date (Note) -
Expired
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Abstract
A process for making 2,6-difluorobenzonitrile, comprising reacting 2,6-dichlorobenzonitrile with a substantially anhydrous metal fluoride at a temperature between about 160.degree. C. and about 300.degree. C. and in the presence of a phase transfer catalyst, which is typically a polyether, tetra-substituted phosphonium salt, tetra-substituted ammonium salt, and cryptand, but in the absence of a solvent. After taking off the product the resulting mixture may be recycled into the reactor for the next reaction cycle. Upon build-up of tars in the reaction process, the invention includes the separation of catalyst from the tars and the recycle thereof.
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