2,2′-Bipyridine was synthesized by using the pyridine as raw material in fixed bed reactor. The influence of NiO∶Al2O3 ratio,catalyst amount,residence temperature,pressure and airspeed was systematically investigated,and suit-able reaction conditions were selected. The optimal conditions for diazotization were as follows:the ratio of NiO∶Al2O3 was 0.06∶1,the amount of catalyst was 70％,the temperature was 400℃,the pressure was 0.6 Mpa and the airspeed was 0.6 h-1,the yield and selectivity of 2,2′-bipyridine were the highest,at 83％ and 90.2％,respectively. The process realizes the continuous synthesis of 2,2′-bipyridine has high safety and high yield,and is suitable for industrial produc-tion.
NiAPO-34molecular sievespyridinecoupled reactionfixed bed reactor2,2′-bipyridine
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