| 摘要 |
A process for the selective chlorination of pyridine, a lower alkyl pyridine or 3-cyanopyridine includes passing the pyridine compound, chlorine and an inert gas through a two stage reaction. In a first reaction zone, these materials are subjected to a hot spot controlled at a temperature of about 350 .degree.C to about 500 .degree.C. The materials are then subsequently passed through a second reaction zone at a relatively lower temperature, for example below about 340 .degree.C.
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