Synthesis method of 4-cyanopyridine
A technology of cyanopyridine and synthesis method, which is applied in the field of synthesis of 4-cyanopyridine, and can solve the problems of low conversion rate and the like
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[0021] The raw material 4-picoline and ammonia are vaporized and preheated to 180-330°C, then enter the mixer and mix with air evenly, and then distribute through the distributor on the upper part of the fixed-bed reactor and then enter the fixed-bed reactor filled with catalyst, controlled The reaction temperature is between 330-450°C, the pressure at the top of the reactor is controlled at 0.020-0.070KPa, the reaction temperature is controlled by molten salt, and the reaction gas after the reaction is separated by condensation and freezing to obtain crude 4-cyanopyridine, crude Go to rectification to get the finished product 4-cyanopyridine.
[0022] Reaction equation:
[0023]
[0024] Described catalyzer is the 4-cyanopyridine ammoxidation catalyst that is carrier with aluminum oxide, and the composition of catalyzer is as follows:
[0025] A a B b C c Cr 10 o x
[0026] Wherein A=Li (or several combinations in Na or Ti or Na, Li, Ti);
[0027] B=V (or several c...
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