Production process of chloropinacolone

A production process, pinatonone technology, applied in the field of monochloropinatone production process, can solve the problems of long reaction time, low production yield, high viscosity, etc., reduce production equipment and production consumption, and reduce production raw material consumption , The effect of reducing the chlorine content

CN113087604APending Publication Date: 2021-07-09鹤壁全丰生物科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2021-07-09

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Abstract

The invention relates to a chloropinacolone production process, which comprises: 1, adding a pinacolone-methanol solution into a reaction kettle, starting a stirring and cooling system, and reducing the temperature of the pinacolone-methanol solution in the reaction kettle to less than 0 DEG C; 2, starting a circulating pump, repeatedly circulating the pinacolone-methanol solution from a circulating discharge port to a feed port of the reaction kettle, arranging a chlorine adding device on a circulating pipeline, introducing chlorine into the pinacolone-methanol circulating solution by the chlorine adding device, and repeatedly circulating until the reaction is finished; and 3, heating and desolventizing the reaction mother liquor obtained in the step 2, and cooling the desolventized feed liquid to obtain the chloropinacolone. The invention provides a production process of chloropinacolone, which can improve the production yield of chloropinacolone, reduce the production time, improve the production efficiency and reduce the consumption of raw materials.
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Description

technical field

[0001] The invention relates to a production process of chloropinatone, which belongs to the technical field of pesticide production. Background technique

[0002] Chloropinatone is an important organic chemical intermediate. Its chemical name is 1-chloro-3,3-dimethyl-2-butanone. Chloropinatone can undergo condensation reaction with many compounds, widely It is applied in the field of preparing pesticide production. Chloropinatone is produced by chlorination of pinacolone. The current production process uses methanol as a solvent for liquid-phase chlorination. Chlorine gas is directly passed into the methanol solution of pinacolone below zero. After reacting for 24 hours, monochloropinatone was obtained. This production method needs to pass into excessive chlorine gas due to the long reaction time of chlorine gas and pinatonone, and the reaction selectivity is poor. During the process, byproducts such as dichloropinatone can be produced, and the obtained Ch...

Examples

Embodiment

[0010] Embodiment: drop into 100kg pinacolone and 200kg methyl alcohol in the mixing kettle 3, after mixing evenly, pinacolone-methanol is dropped in the reactor 1, the stirring of opening reactor and the brine cooling pipeline 2, in the reactor The temperature of the pinacolone-methanol mother liquor drops below 0°C; the circulating pump 10 is turned on, and the pinacolone-methanol solution is repeatedly circulated from the reactor circulation outlet to the feed inlet, and a cooling heat exchanger 5 is arranged on the circulation pipeline. Keep the temperature of the circulating mother liquid below 0°C, install a Venturi mixer 6 at the inlet of the cooling heat exchanger, connect the gas inlet of the Venturi mixer to the chlorine gas pipeline 4, and add chlorine gas at a rate of 0.5-1.0kg / min, repeat the cycle After the addition of chlorine gas, keep it for 30 minutes. After the reaction is completed, stop the circulation, open the inlet valve of the precipitation kettle, pour...