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Novel fluorination process of p-chlorobenzotrifluoride

A technology of p-chlorobenzotrifluoride and p-chlorobenzotrifluoride, which is applied in the new field of fluorination of p-chlorobenzotrifluoride, can solve the problems of high cost and harmful environment, and achieve low cost, convenient recycling and remarkable economic benefits Effect

Inactive Publication Date: 2019-11-22
JIANGSU DAHUA CHEM IND
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AI Technical Summary

Problems solved by technology

The fluorination step generally uses organic catalysts or noble metal catalysts to fluorinate the side chains, which has the problems of high cost and harmful to the environment

Method used

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  • Novel fluorination process of p-chlorobenzotrifluoride

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Embodiment 1

[0023] Chlorination: Put 500kg of p-chlorotoluene into the dehydration kettle and heat it to 80°C to remove the water, then pump it into a 3000L chlorination kettle, raise the temperature to 110℃, add 40kg of catalyst, and start to pass the vaporizer gas into the chlorination kettle Chlorine gas after chlorination, the flow rate of chlorine gas is controlled to 40-80 m3 / h, and cooling water is passed into the jacket of the chlorination kettle at the same time, the temperature is controlled at 110-115 ° C, and the reaction time is 24 hours. After sampling and analyzing the chlorinated material as qualified, stop the chlorine flow. The p-chlorotrichlorotoluene produced by chlorination is pumped into the chlorination tank for use, and the tail gas generated by the reaction is sent to the tail gas absorption device. Fluorination: Pump 700kg of p-chlorotrichlorotoluene into the head tank for metering and put it into the fluorination kettle, open the frozen brine system, press 340kg...

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Abstract

The invention discloses a novel fluorination process of p-chlorobenzotrifluoride. P-chlorotoluene is used as a raw material, and 4-chlorobenzotrifluoride is synthesized through two steps of chlorination and fluorination. Compared with the prior art, the fluorination process has the advantages of no catalyst, lower cost than other organic catalysts or noble metal catalysts, convenience in recoveryand no pollution to the environment; a solvent-free fluorination process is adopted, so that the emission of by-products and waste gas of a solvation reaction is greatly reduced, and the emission of pollutants in the production process is reduced.

Description

technical field [0001] The invention relates to a new fluorination process of pesticide chemical intermediate products, in particular to a new fluorination method of p-chlorobenzotrifluoride. This method is applicable to the occasion of synthesizing p-chlorobenzotrifluoride through two steps of chlorination and fluorination by using p-chlorotoluene as raw material. Background technique [0002] p-chlorobenzotrifluorotoluene (p-chlorobenzotrifluoride) is a colorless transparent liquid with the smell of halogenated benzene. The compound is insoluble in water, but miscible with benzene, toluene, ethanol, ether, halogenated hydrocarbons, etc. p-Chlorotrifluorotoluene is an important intermediate in organic synthesis, and the fluorine atom it contains endows it with special activity. It is widely used in fine organic synthesis fields such as medicine, pesticide, and dyestuff. p-Chlorobenzotrifluoride is a key intermediate in the synthesis of various fluorine-containing insectic...

Claims

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Application Information

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IPC IPC(8): C07C25/13C07C17/20
CPCC07C17/14C07C17/206C07C25/02C07C25/13
Inventor 郑龙洲方东张亮李付香
Owner JIANGSU DAHUA CHEM IND
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