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Production method of low hexachlorobenzene content chlorothalonil

A production method and technology of chlorothalonil, applied in chemical instruments and methods, botanical equipment and methods, biocides, etc., can solve problems such as difficulty in natural degradation, and achieve low cost, increased operation flexibility, production process and emissions. The effect of cleaning and environmental protection

Inactive Publication Date: 2008-07-23
YUNNAN CHEM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The substance has strong resistance to biological metabolism, photodegradation and chemical degradation in the natural environment, and natural degradation is extremely difficult

Method used

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  • Production method of low hexachlorobenzene content chlorothalonil
  • Production method of low hexachlorobenzene content chlorothalonil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Such as figure 1 As shown, isophthalonitrile is fed into the vaporizer from line 1, and the feed amount is 1 mol / hr. After the isophthalonitrile is completely vaporized, the nitrogen gas input from the pipeline 3 is taken out of the vaporizer, and the flow rate of the nitrogen gas is 10 mol / hr. It is mixed with the chlorine gas in pipeline 2, and enters the fluidized bed from under the distribution plate of the fluidized bed, and the flow rate of the chlorine gas is 2mol / hr. The fluidized bed is equipped with a fluidized bed catalyst, the reaction temperature is set at 320°C, and the pressure is 0.03MPa, and the first step of reaction is carried out in the fluidized bed. The reaction product is mixed with the chlorine gas transported by the pipeline 4, and the flow rate of the chlorine gas is 2mol / hr, and enters the fixed bed for the final stage of chlorination. The fixed bed is equipped with a fixed bed catalyst, and the set reaction temperature is 340° C. and the pr...

Embodiment 2

[0021] Repeat embodiment 1, following difference is arranged: the fluidized bed reaction temperature is 220 ℃, and the amount of chlorine entering the fluidized bed reactor is 3mol / hr, and the pressure in the fluidized bed reactor is stable at 0.005Mpa; The fixed bed reaction temperature is At 240°C, the amount of chlorine gas entering the fixed bed reactor is 3mol / hr, and the pressure in the fixed bed is stable to 0.005Mpa. Sampling analysis, test results are shown in Table 1.

Embodiment 3

[0023] Repeat Example 1, with the following differences: the amount of chlorine entering the fluidized bed reactor is 2mol / hr, the reaction temperature is 250°C, and the fluidized bed pressure is stable to 0.08Mpa. The feed rate of chlorine into the fixed bed reactor is 3mol / hr, the reaction temperature is 280°C, and the pressure is stable to 0.08Mpa. Sampling analysis, test results are shown in Table 1.

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Abstract

The present invention discloses a production method of chlorothalonil with low hexachlorobenzene content. Said production method includes the following steps: firstly, vapourizing m-dicyanobenzene, using nitrogen gas to carry out the vapourized m-dicyanobenzene from the vapourizer, making the vapourized m-dicyanobenzene be mixed with chlorine gas, and making them be fed into fluidized bed to make first-step reaction, making the reaction product be further mixed with chlorine gas and feeding them into fixed bed to make chlorination, condensing and collecting the outputted mixed gas so as to oblain the invented chlorothalonil product.

Description

technical field [0001] The invention belongs to the technical field of chemical production and relates to the preparation of a fungicide chlorothalonil, in particular to a production method capable of effectively reducing the content of hexachlorobenzene in chlorothalonil. Background technique [0002] Chlorothalonil is a high-efficiency, broad-spectrum, low-toxicity, low-residue fungicide, created in 1968 by Diamond Shaumrock Company of the United States. The existing chlorothalonil production technologies are mainly divided into three types: fluidized bed, fixed bed and composite bed. Among them, compared with the fluidized bed process, the fixed bed process has higher yield and better product quality, but has disadvantages such as low thermal efficiency, easy sintering blockage during chlorination, and difficulty in loading and unloading catalysts. Although the fluidized bed process has high thermal efficiency, uniform temperature distribution in the bed, and convenient ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C255/51C07C253/30A01N37/34A01P3/00
Inventor 梁雪松吴立群肖勇杨云松梅毅
Owner YUNNAN CHEM RES INST
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