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

1979-02-22

1980-09-30

Rotman, Alan L.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D21304

Patent

active

042257182

ABSTRACT:
Substantially pure 2,3,5,6-tetrachloropyridine is recovered from a mixture of chlorinated pyridines containing initially 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 said second mixture. The reaction is normally conducted at a temperature of from about 150.degree. C. to about 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.

REFERENCES:
patent: 3370062 (1965-02-01), Corran
patent: 3732230 (1973-05-01), Brewer et al.

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