A kind of trapping method and trapping system for tetrachloroisophthalonitrile reaction gas

Abstract

The invention provides a trapping method and trapping system for reaction gas of tetrachloroisophthalonitrile, wherein the trapping method comprises: the reaction gas transported by the upstream production line is filtered and enters a multi-stage trapping unit, After mixing with liquid nitrogen at least twice in the multi-stage trapping unit, the reactant gas is mixed with liquid nitrogen and then desublimated to trap and precipitate tetrachloroisophthalonitrile therein. The present invention uses liquid nitrogen as the cooling medium of the trapping device, and the liquid nitrogen enters the trapping device through a distributor to be vaporized directly, and the tetrachloroisophthalonitrile gas in the reaction gas contacts with the liquid nitrogen to directly sublimate and precipitate tetrachloroisophthalonitrile Formonitrile reaches the bottom of the capture device and enters the product silo through the conveyor. The traditional air cooling or water cooling method is replaced by liquid nitrogen cooling, which effectively avoids the use of jacketed cooling medium to cool the reaction gas in the traditional capture process, which will cause material wall formation and The collapse phenomenon effectively solves the technical problem that the discharge port at the bottom of the trapping device is blocked and affects normal production.

Description

technical field [0001] The invention belongs to the technical field of product capture, and relates to a capture method and a capture system, in particular to a capture method and a capture system for reaction gas of tetrachloroisophthalonitrile. Background technique [0002] Tetrachloroisophthalonitrile, also known as chlorothalonil, is a high-efficiency, low-toxicity, broad-spectrum protective fungicide, which mainly prevents various fungal diseases. Its mechanism of action is to interact with glycerol triphosphate in fungal cells Aldehyde dehydrogenase acts and combines with the protein containing cysteine ​​in the enzyme, thereby destroying the activity of the enzyme, destroying the metabolism of fungal cells and losing their vitality. Chlorothalonil has no systemic conduction effect, but after being sprayed on the plant body, it can have good adhesion on the body surface and is not easily washed away by rain, so the efficacy period is longer. It is mainly used for the ...

AI Technical Summary

Problems solved by technology

[0006] In view of the deficiencies in the prior art, the object of the present invention is to provide a trapping method and trapping system for tetrachloroisophthalonitrile reaction gas. The present invention uses liquid nitrogen as the cooling medium of the trapping device. Nitrogen enters the capture device through the sparger and is directly vaporized. The tetrachloroisophthalonitrile gas in the reaction gas contacts with liquid nitrogen and directly desublimes to precipitate tetrachloroisophthalonitrile to the bottom of the capture device, and enters the product material through the conveyor. The warehouse replaces the traditional air-cooled or water-cooled indirect capture method with liquid nitrogen direct contact capture, which effectively avoids the use of jacketed cooling medium in the traditional capture process to cool the reaction gas due to small heat transfer area and large local temperature difference. Cooling and crystallization on the inner wall of the trap will cause wall formation and material collapse, thus effectively solving the technical problem of blockage of the discharge port at the bottom of the trap and affecting normal production

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