Chlorination process
First Claim
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1. A process for selectively chlorinating 3-cyanopyridine, comprising:
- passing a vaporized reed stream including 3-cyanopyridine, chlorine and an inert gas into a first reaction zone having a hot spot controlled at a temperature of at about 350°
C. to about 500°
C., and subsequently through a second reaction zone at a temperature below about 340°
C.
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Abstract
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° to about 500° C. The materials are then subsequently passed through a second reaction zone at a relatively lower temperature, for example below about 340° C.
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Citations
27 Claims
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1. A process for selectively chlorinating 3-cyanopyridine, comprising:
passing a vaporized reed stream including 3-cyanopyridine, chlorine and an inert gas into a first reaction zone having a hot spot controlled at a temperature of at about 350°
C. to about 500°
C., and subsequently through a second reaction zone at a temperature below about 340°
C.- View Dependent Claims (2, 3, 4, 8, 9, 10)
- 5. The process of claim I wherein the second reaction zone is at a temperature above about 200°
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11. A process for producing 2-chloro-5-cyanopyridine by chlorination of 3-cyanopyridine with chlorine, comprising:
passing a vaporized feed stream including 3-cyanopyridine, chlorine and an inert gas into a first reaction zone having a hot spot at a temperature of about 350°
C. to about 420°
C., and subsequently passing the stream through a second reaction zone having a temperature of about 200°
C. to about 340°
C., so as to produce 2-chloro-5-cyanopyridine.- View Dependent Claims (12, 13, 14, 15, 16)
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17. A process for selectively chlorinating pyridine, a lower alkyl pyridine or 3-cyanopyridine, comprising:
passing a vaporized feed stream including pyridine, or lower alkyl pyridine or 3-cyanopyridine, chlorine and an inert gas into a first reaction zone having a hot spot controlled at a temperature of at about 350°
C. to about 500°
C., and subsequently through a second reaction zone at a temperature below about 340°
C.- View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
Specification