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High-yield trichloroacetyl chloride preparation system and method

A high-yield technology of trichloroacetyl chloride and trichloroacetyl chloride is applied in the preparation of carboxylates, chemical instruments and methods, preparation of organic compounds, etc., and can solve problems such as low yield of trichloroacetyl chloride

Pending Publication Date: 2021-11-19
宁夏荣泰生物科技有限公司
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Problems solved by technology

Then the yield is lower in the method for preparing trichloroacetyl chloride in the existing chloroacetic acid waste liquid chlorination

Method used

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  • High-yield trichloroacetyl chloride preparation system and method
  • High-yield trichloroacetyl chloride preparation system and method
  • High-yield trichloroacetyl chloride preparation system and method

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Embodiment Construction

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings that need to be used in the embodiments. Obviously, the accompanying drawings in the following description are some embodiments of the present invention. Ordinary technicians can also obtain other drawings based on these drawings on the premise of not paying creative work.

[0018] see figure 1 , the embodiment of the present invention provides a high-yield trichloroacetyl chloride preparation system, comprising a first reaction kettle 10, a first condenser 20, a first solid-liquid separator 30, a second reaction kettle 40, and a second condenser 50. The second solid-liquid separator 60, supplementary tank 70, the acid chloride mixture prepared by the mother liquor of chloroacetic acid is added to the inside of the first reactor 10, the first reactor 10 is provided with holes for feeding chlorine gas, the...

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Abstract

The invention provides a high-yield trichloroacetyl chloride preparation method which comprises the steps of introducing chlorine into an acyl chloride mixture, and carrying out deep chlorination reaction to generate trichloroacetyl chloride; in the later stage of the reaction, detecting the component content of substances in the reaction kettle, if the content of acid components is high, adding disulfur dichloride into the reaction kettle, and enabling the generated acyl chloride mixture to still continue to be subjected to deep chlorination reaction with chlorine to generate trichloroacetyl chloride. According to the scheme, in the reaction process in the reaction kettle, the acyl chloride mixture and chlorine are subjected to deep chlorination, chloroacetic acid and dichloroacetic acid may be remained, components of materials in the reaction kettle are analyzed and detected at the moment, disulfur dichloride is added from a supplementing tank according to a detection result, the adding amount of the disulfur dichloride is controlled through a flow valve and a control valve, then the acid continues to be subjected to chlorination reaction to completely generate monochloroacetyl chloride and dichloroacetyl chloride, and then the monochloroacetyl chloride and the dichloroacetyl chloride continue to be subjected to deep chlorination, and are converted into trichloroacetyl chloride, so that the yield of the trichloroacetyl is improved.

Description

technical field [0001] The invention relates to the technical field of trichloroacetyl chloride preparation, in particular to a high-yield trichloroacetyl chloride preparation system and method. Background technique [0002] Trichloroacetyl chloride is an important intermediate in the synthesis of organophosphorus insecticides chlorpyrifos and chlorpyrifos-methyl, and most of the trichloroacetyl chloride currently on the market is used in the production of chlorpyrifos. Chlorpyrifos is a high-efficiency, broad-spectrum, low-residue and low-resistance organophosphorus pesticide. With the prohibition of five highly toxic organophosphorus pesticides such as methamidophos and fipronil, chlorpyrifos will become one of the main alternatives. As an intermediate of chlorpyrifos, trichloroacetyl chloride has a broad market space in the future. [0003] There are many ways to prepare trichloroacetyl chloride, for example, it can be obtained by reacting acetyl chloride or acetaldehyd...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C53/48C07C51/62
CPCC07C51/62C07C53/48
Inventor 白耀杰钟骏樊俊宽吴淑媛
Owner 宁夏荣泰生物科技有限公司
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