Efficient absorption method for 2-cyanopyridine
A technology of cyanopyridine and picoline ammonia, which is applied in the field of 2-cyanopyridine synthesis, can solve the problems of small contact area and insufficient contact of reaction gas, and achieve uniform spatial distribution, small particle diameter and dense spatial distribution Effect
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[0022] Example 1:
[0023] Such as figure 1 As shown, the reaction mixture gas produced by ammoxidation in the ammoxidation reactor 1 is initially cooled to 200-230℃ by the heat exchanger 2, and then enters the absorption tower 3, and sprays it with the high-pressure water mist nozzle 3-1. The high-pressure fine water mist produced is subjected to heat exchange and material exchange, and the condensed product sinks into the bottom of the absorption tower 3, is cooled by the cooler 3-2, and is sent to the subsequent 2-cyanopyridine separation and purification system; The condensed gas enters the tubular cooler 4 from the top of the absorption tower 3 for cooling. The cooled liquid phase enters the storage tank 5, merges with the water inlet pipe 7, and is pressurized to the high pressure fine water mist pump 6 Water mist nozzle 3-1; non-condensable gas is discharged from the top of the storage tank 5 and enters the exhaust gas treatment system.
[0024] An efficient 2-cyanopyridine
Example Embodiment
[0026] Example 2:
[0027] A high-efficiency absorption method for 2-cyanopyridine: in the process of preparing 2-cyanopyridine by ammoxidation of 2-picoline, high-pressure water mist is used as the absorbent, and the temperature obtained after the ammoxidation reaction and preliminary cooling The mixed gas at 205-210°C is cooled and absorbed; the particle size of the high-pressure water mist is less than 50 μm. The high-pressure fine water mist is sprayed from the high-pressure fine water mist nozzle set at the top of the absorption tower, and the 2-cyanopyridine aqueous solution obtained at the bottom of the tower stays in the absorption tower for no more than 0.5 h., and then is pumped to The subsequent separation and purification are carried out in the rectifying tower. The water used in the high-pressure water mist is pure water, and the water is used once and not directly recycled. details as follows:
[0028] The preheated 2-methylpyridine (flow rate 10.0 kg / h), ammonia,
Example Embodiment
[0029] Example 3:
[0030] A high-efficiency absorption method for 2-cyanopyridine: in the process of preparing 2-cyanopyridine by ammoxidation of 2-picoline, high-pressure water mist is used as the absorbent, and the temperature obtained after the ammoxidation reaction and preliminary cooling The mixed gas at 218-225°C is cooled and absorbed; the particle size of the high-pressure water mist is less than 50 μm. The high-pressure fine water mist is sprayed from the high-pressure fine water mist nozzle set at the top of the absorption tower, and the 2-cyanopyridine aqueous solution obtained at the bottom of the tower stays in the absorption tower for no more than 0.5 h., and then is pumped to The subsequent separation and purification are carried out in the rectifying tower. The water used in the high-pressure water mist is pure water, and the water is used once and not directly recycled. details as follows:
[0031] The preheated 2-methylpyridine (flow rate 9.5 kg / h) and air mi
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