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Tube-type fluid bed reactor in production of chlorothalonil

A fluidized bed reactor and tubular heat exchanger technology, applied in chemical instruments and methods, organic chemistry, chemical/physical processes, etc., can solve the problems of intense reaction, large bed pressure drop, and high reaction temperature, Achieve the effects of stable product quality, improved fluidization state, and increased heat exchange area

Active Publication Date: 2011-03-16
JIANGSU XINHE AGROCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main reactor of tetrachloroisophthalonitrile is a fluidized bed. Domestic manufacturers use serpentine tubes for heat exchange, especially there is a certain distance between the lower head and the cylinder. The arrangement cannot be uniform, resulting in poor fluidization state, difficult removal of heat, easy breakage of the catalyst, large bed pressure drop, resulting in too strong reaction, high reaction temperature locally, and temperature deviation of stream 1, stream 2, and stream 3. 2~5℃, partial overchlorination is easy to occur, and the content of hexachlorobenzene is relatively high. Under normal circumstances, hexachlorobenzene is generally 40~60PPm, which cannot meet the requirements of the international market.

Method used

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  • Tube-type fluid bed reactor in production of chlorothalonil
  • Tube-type fluid bed reactor in production of chlorothalonil

Examples

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Effect test

Embodiment 1

[0011] Such as figure 1 As shown, a shell and tube fluidized bed reactor in the production of chlorothalonil, the fluidized bed of the reactor includes a serpentine tube heat exchanger (U-shaped tube heat exchanger 1 in this embodiment) and a tube tube Type heat exchanger 2, the U-shaped tube heat exchanger 1 is arranged under the lower head of the fluidized bed, and the tube-and-tube heat exchanger 2 is arranged between the U-shaped tube heat exchanger 1 and the fluidized bed between cylinders. The tubes of the tube-and-tube heat exchanger are stainless steel tubes with a diameter of 108 mm and a length of 6 m. There are 9 tubes arranged in an equilateral triangle. The other components of the reactor are the same as common fluidized bed reactors.

[0012] Since it was put into production, the temperature deviation of stream 1, stream 2, and stream 3 is less than 0.5-1°C, and the fluidization state is very uniform, and there is no poor fluidization state such as surge and ch...

Embodiment 2

[0014] A shell and tube fluidized bed reactor in the production of chlorothalonil, the fluidized bed of the reactor includes a serpentine tube heat exchanger and a shell and tube heat exchanger, and the serpentine tube heat exchanger is arranged in the flow Below the lower head of the fluidized bed, the shell-and-tube heat exchanger is arranged between the serpentine tube heat exchanger and the cylinder of the fluidized bed. The tubes of the tube-and-tube heat exchanger are stainless steel tubes with a diameter of 89mm and a length of 4m, and there are 3 tubes arranged in an equilateral triangle.

Embodiment 3

[0016] A shell and tube fluidized bed reactor in the production of chlorothalonil, the fluidized bed of the reactor includes a serpentine tube heat exchanger and a shell and tube heat exchanger, and the serpentine tube heat exchanger is arranged in the flow Below the lower head of the fluidized bed, the shell-and-tube heat exchanger is arranged between the serpentine tube heat exchanger and the cylinder of the fluidized bed. The tubes of the tube-and-tube heat exchanger are stainless steel tubes with a diameter of 133 mm and a length of 7 m. There are 15 tubes arranged in an equilateral triangle.

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Abstract

The invention relates to a tube-type fluid bed reactor in the production of chlorothalonil. The fluid bed of the reactor comprises a coil heat exchanger and a tube-type heat exchanger. The coil heat exchanger is arranged below the lower end socket of the fluid bed, and the tube-type heat exchanger is arranged between the coil heat exchanger and the barrel body of the fluid bed. Compared with the prior art, the tube-type fluid bed reactor has the advantages of high temperature, high yield, low cost and the like.

Description

technical field [0001] The invention relates to a production of chlorothalonil, in particular to a tubular fluidized bed reactor in the production of chlorothalonil. Background technique [0002] Tetrachloroisophthalonitrile is obtained by chlorination of isophthalonitrile in a fluidized bed. Tetrachloroisophthalonitrile, the English name is chlorothalonil, and the common name is chlorothalonil. It is a broad-spectrum fungicide with high efficiency and low toxicity. Its main function is to prevent crops from being infected by fungi; Agents, fruit preservatives, fungicides, protective agents for coatings and adhesives. The main reactor of tetrachloroisophthalonitrile is a fluidized bed. Domestic manufacturers use serpentine tubes for heat exchange, especially there is a certain distance between the lower head and the cylinder. The arrangement cannot be uniform, resulting in poor fluidization state, difficult removal of heat, easy breakage of the catalyst, large bed pressure...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J8/24C07C255/51C07C253/34
Inventor 陆正松胡清
Owner JIANGSU XINHE AGROCHEM
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