PROCESS FOR RECOVERING 2,3,5,6-TETRACHLOROPYRIDINE

Substantially pure 2,3,5,6-tetrachloro-pyridine is recovered from a mixture of chlorinated pyridines containing 2,3,5,6-tetrachloropyridine and other chlorinated pyridines in an improved process which comprises (a) reacting by contacting a first mixture of chlorinated pyridines with chlorine in the...

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Bibliographic Details
Main Authors PERETTIE, DONALD J, DEAN, NORMAN L
Format Patent
LanguageEnglish
French
Published 15.07.1980
Subjects
CHEMISTRY
HETEROCYCLIC COMPOUNDS
METALLURGY
ORGANIC CHEMISTRY
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Summary:Substantially pure 2,3,5,6-tetrachloro-pyridine is recovered from a mixture of chlorinated pyridines containing 2,3,5,6-tetrachloropyridine and other chlorinated pyridines in an improved process which comprises (a) reacting by contacting a first mixture of chlorinated pyridines with chlorine in the presence of a strong Lewis acid catalyst to thereby obtain a second mixture consisting essentially of 2,3,5,6-tetrachloropyridine and pentachloropyridine, and (b) recovering the 2,3,5,6-tetrachloropyridine from the second mixture. The reaction is normally conducted at a temperature of from 150.degree.C to 300.degree.C by pressurizing chlorine into a molten mixture of the chlorinated pyridines and maintaining such conditions until substantially all of the isomers have been converted to the symmetrical tetrachloropyridine or pentachloropyridine.
Bibliography:Application Number: CA19790331419