Rectification and separation device and method for 2-cyanopyridine base material

Abstract

The invention discloses a rectification separation device and method for a 2-cyanopyridine backing material. The method comprises the following steps: pouring a prepared backing material into a heating stirring kettle, driving a stirring shaft and stirring blades to stir by a stirring motor in the heating stirring kettle, and heating in cooperation with a heating resistor, so that ammonia water in the backing material is decomposed into ammonia gas in an accelerated manner; ammonia gas is mixed with other gases and guided into the rectification separation tower through the heat preservation connecting pipe, firstly, the sulfuric acid solution at the bottom of the rectification shell is bubbled through the gas outlet guide pipe, so that the sulfuric acid solution absorbs a large amount of ammonia gas, and meanwhile, a small part of ammonia gas and other gases are upwards absorbed through the filter screen plate, the coarse filter filler and the fine filter filler; and finally, the residual gas is conveyed to the liquefaction assembly through the heat preservation connecting pipe, liquefied through the liquefaction assembly and then guided into the heating stirring kettle again through the conveying pipe, the heating stirring kettle continues to conduct heating and stirring to conduct the next rectification separation cycle, ammonia water in the prepared base material is effectively separated, and the situation that the ammonia water is decomposed into ammonia gas and pollutes the environment is avoided.

Description

technical field [0001] The invention relates to the technical field of rectification and separation, in particular to a device and method for rectification and separation of 2-cyanopyridine bottom material. Background technique [0002] The molecular formula of 2-cyanopyridine is C 6 h 4 N 2 , the molecular weight is 104.11, white to light yellow crystals at low temperature, insoluble in water, mainly used as intermediates of pharmaceuticals and dyes, often stored in a cool, ventilated warehouse, away from fire and heat sources, should be stored separately from oxidants, and should not be mixed It needs to be sealed and stored, often stored in a dark place, and the storage place should be equipped with explosion-proof lighting and ventilation facilities to avoid explosions. In the synthesis process of 2-cyanopyridine, it is usually necessary to add ammonia water to synthesize cyano groups. After the preparation of 2-cyanopyridine is completed, there is still unreacted amm...

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Problems solved by technology

[0002] The molecular formula of 2-cyanopyridine is C 6 h 4 N 2 , the molecular weight is 104.11, white to light yellow crystals at low temperature, insoluble in water, mainly used as intermediates of pharmaceuticals and dyes, often stored in a cool, ventilated warehouse, away from fire and heat sources, should be stored separately from oxidants, and should not be mixed It needs to be sealed and stored, often stored in a dark place, and the storage place should be equipped with explosion-proof lighting and ventilation facilities to avoid explosions. In the synthesis process of 2-cyanopyridine, it is usually necessary to add ammonia water to synthesize cyano groups. After the preparation of 2-cyanopyridine is completed, there is still unreacted ammonia water, and ammonia water is easily decomposed into ammonia gas, which is distributed in the air, thereby polluting the environment. At present, there is no preparation base for 2-cyanopyridine In the material, the equipment that effectively separates ammonia water or ammonia gas effectively leads to the problem that it is difficult to handle the preparation of the bottom material

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