Process for recovering 2,3,5,6-tetrachloropyridine

Details Process for recovering 2,3,5,6-tetrachloropyridine Process for recovering 2,3,5,6-tetrachloropyridine

C - Chemistry, Metallurgy

07

D

260/295.2

C07D 213/61 (2006.01)

Patent

CA 1081697

ABSTRACT 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°C to 300°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.

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