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Purifying device and purifying method for producing chlorothalonil with less than 10ppm of hexachlorobenzene

A technology of chlorothalonil and hexachlorobenzene, which is applied in the purification/separation of carboxylic acid nitrile, organic chemistry and other directions, can solve the problems of non-degradation of hexachlorobenzene, environmental hazards, etc., and achieves low hexachlorobenzene content, low equipment investment, Simple effect of purification device

Pending Publication Date: 2019-02-01
JIANGSU XINHE AGROCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the internal quality requirements of chlorothalonil have been significantly improved in the international market. In addition to the content and appearance, there is a special emphasis on the control of the harmful substance HCB (hexachlorobenzene). Hexachlorobenzene is not easy to degrade and is harmful to the environment. Serious harm

Method used

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  • Purifying device and purifying method for producing chlorothalonil with less than 10ppm of hexachlorobenzene
  • Purifying device and purifying method for producing chlorothalonil with less than 10ppm of hexachlorobenzene
  • Purifying device and purifying method for producing chlorothalonil with less than 10ppm of hexachlorobenzene

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Embodiment 1

[0077] This embodiment provides a purification device for producing chlorothalonil with hexachlorobenzene not exceeding 10 ppm. The purification device includes a raw material supply unit, a purification unit and a product collection unit connected in sequence.

[0078] Described purifying unit comprises rectifying tower 8, refining kettle 9 and condenser 10, and the tower bottom outlet of rectifying tower 8 is connected with the inlet of refining kettle 9, and the outlet of refining kettle 9 is connected with condenser 10. The feed port is connected, the material of the rectification tower 8, the refining kettle 9 and the condenser 10 is 304 stainless steel, the outer wall of the rectification tower 8 is provided with heat tracing pipes, and the top of the rectification tower 8 is provided with a tubular condenser 10, the bottom of the rectifying tower 8 is provided with a tube-and-tube reboiler, the outer wall of the refining kettle 9 is provided with a jacket, and the interi...

Embodiment 2

[0084] This embodiment provides a purification device for producing chlorothalonil with no more than 10 ppm of hexachlorobenzene. The schematic diagram of the purification device is as follows figure 1 As shown, the purification device includes a raw material supply unit, a purification unit and a product collection unit connected in sequence.

[0085] Described purifying unit comprises rectifying tower 8, refining kettle 9, condenser 10, front fraction catcher 13 and front fraction vacuum pump 16, and the outlet at the bottom of rectifying tower 8 is connected with the inlet of refining kettle 9, The discharge opening of refining still 9 is connected with the feed inlet of condenser 10, and the material of described rectifying tower 8, refining still 9, front fraction catcher 13 and condenser 10 is 304 stainless steel, and described rectifying tower 8 The outer wall of the rectifying tower 8 is provided with a heat tracing pipe, the top of the rectifying tower 8 is provided w...

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Abstract

The invention relates to a purifying device and a purifying method for producing chlorothalonil with less than 10ppm of hexachlorobenzene. The purifying device comprises a raw material supplying unit,a purifying unit and a production collecting unit which are connected successively, the purifying unit comprises a rectifying tower, a refining kettle and a condenser, a discharge hole at the bottomof the rectifying tower is connected with a feed hole of the refining kettle, and a discharge hole of the refining kettle is connected with a feed hole of the condenser. By combining the rectifying tower and the refining kettle in use, the chlorothalonil with 10-100ppm of the hexachlorobenzene is rectified by the rectifying tower and then refined by the refining kettle, the content of the hexachlorobenzene in the chlorothalonil is reduced and is enabled not to exceed 10ppm in a chlorothalonil product, and the content of the chlorothalonil in the chlorothalonil product can reach to 99.7%. the purifying device can be used for continuous production and is low in cost.

Description

technical field [0001] The invention belongs to the field of pesticide production, and relates to a purification device, in particular to a purification device and method for producing chlorothalonil, in particular to a purification device and method for producing chlorothalonil with hexachlorobenzene not exceeding 10 ppm. Background technique [0002] Chlorothalonil is a high-efficiency, low-toxicity, broad-spectrum, low-residue protective fungicide, which is widely used in the control of fungal diseases in agriculture and forestry, especially in vegetables, fruits and other economic crops. According to Japanese data, chlorothalonil can prevent and control fifty-two diseases of more than thirty kinds of crops. In addition, chlorothalonil also has important uses in the anti-mold industry, such as the manufacture of anti-mold paint, anti-mold wallpaper, anti-mold of electrical appliances, and anti-mold of apples and wood. The production scale of chlorothalonil in China is co...

Claims

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Application Information

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IPC IPC(8): C07C253/34C07C255/51
CPCC07C253/34C07C255/51
Inventor 王海波李强禚文峰
Owner JIANGSU XINHE AGROCHEM
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