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Trapping method and trapping system for tetrachloroisophthalonitrile reaction gas

A technology of tetrachloroisophthalonitrile and reaction gas, applied in separation methods, chemical instruments and methods, purification/separation of carboxylic acid nitriles, etc., can solve problems such as blockage of the discharge port and affect normal production, and achieve contact exchange Increased thermal area, improved capture efficiency and production benefits, and reduced unqualified solid waste

Active Publication Date: 2020-11-03
JIANGSU XINHE AGROCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Trapping method and trapping system for tetrachloroisophthalonitrile reaction gas

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Embodiment 1

[0089] This embodiment provides a kind of trapping method that is used for tetrachloroisophthalonitrile reaction gas, and described trapping method comprises:

[0090] (1) The reaction gas transported by the upstream production line is filtered by the bag filter device and then passed into the fixed bed filter device through the insulation pipe. A heat transfer medium is introduced into the jacket of the heat preservation pipe to heat the reaction gas flowing through the heat preservation pipe. 30m 3 / h, the temperature in the insulation tube is controlled at 320°C;

[0091] (2) The reaction gas discharged from the fixed bed filter device flows through the first trapping device and the second trapping device in sequence, and the liquid nitrogen with a content of 99% is independently passed into the first trapping device and the second trapping device through the uniform distribution device collection device, the reaction gas is mixed with liquid nitrogen in the first collect...

Embodiment 2

[0097] This embodiment provides a kind of trapping method that is used for tetrachloroisophthalonitrile reaction gas, and described trapping method comprises:

[0098](1) The reaction gas transported by the upstream production line is filtered by the bag filter device and then passed into the fixed bed filter device through the insulation pipe. A heat transfer medium is introduced into the jacket of the heat preservation pipe to heat the reaction gas flowing through the heat preservation pipe. 27m 3 / h, the temperature in the insulation tube is controlled at 325°C;

[0099] (2) The reaction gas discharged from the fixed bed filter device flows through the first trapping device and the second trapping device in sequence, and the liquid nitrogen with a content of 99.2% is independently passed into the first trapping device and the second trapping device through the uniform distribution device collection device, the reaction gas is mixed with liquid nitrogen in the first collec...

Embodiment 3

[0105] This embodiment provides a kind of trapping method that is used for tetrachloroisophthalonitrile reaction gas, and described trapping method comprises:

[0106] (1) The reaction gas transported by the upstream production line is filtered by the bag filter device and then passed into the fixed bed filter device through the insulation pipe. A heat transfer medium is introduced into the jacket of the heat preservation pipe to heat the reaction gas flowing through the heat preservation pipe. 25m 3 / h, the temperature in the insulation tube is controlled at 330°C;

[0107] (2) The reaction gas discharged from the fixed bed filter device flows through the first trapping device and the second trapping device in sequence, and the liquid nitrogen with a content of 99.5% is independently passed into the first trapping device and the second trapping device through the uniform distribution device collection device, the reaction gas is mixed with liquid nitrogen in the first colle...

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Abstract

The invention provides a trapping method and a trapping system for tetrachloroisophthalonitrile reaction gas. The trapping method comprises the following steps: filtering the reaction gas conveyed byan upstream production line, feeding the reaction gas into a multistage trapping unit, mixing the reaction gas with liquid nitrogen for at least two times in the multistage trapping unit, mixing the reaction gas with the liquid nitrogen, and desublimating the mixed gas to obtain the tetrachloroisophthalonitrile reaction gas, thus trapping and separating the tetrachloroisophthalonitrile. Liquid nitrogen is used as a cooling medium of the trapping device and enters the trapping device through the distributor to be directly vaporized, so that tetrachloroisophthalonitrile gas in reaction gas makescontact with the liquid nitrogen to be directly desublimated to separate out tetrachloroisophthalonitrile to the bottom of the trapping device, and the tetrachloroisophthalonitrile gas enters the product bin through the conveyor. In the process, a traditional air cooling or water cooling mode is replaced with a liquid nitrogen cooling mode, and the phenomena of material wall bonding and materialcollapsing caused by the fact that a jacket cooling medium is used for cooling reaction gas in a traditional trapping process are effectively avoided, so that the technical problems that a discharge port in the bottom of the trapping device is blocked, and normal production is affected are effectively solved.

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 ...

Claims

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Application Information

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IPC IPC(8): B01D7/02C07C253/34C07C255/51
CPCB01D7/02C07C253/34C07C255/51
Inventor 禚文峰顾林健潘修伟王晴
Owner JIANGSU XINHE AGROCHEM