A process and device for effectively improving the production efficiency of 4-chloro-3,5-dimethylphenol chlorination reaction

Abstract

The invention provides a process and device that can effectively improve the production efficiency of the chlorination reaction of 4-chloro-3,5-dimethylphenol. The process includes a spray absorption process: the liquid inlet of the chlorine injector enters the chlorination agent mixing tank The liquid sulfuryl chloride and the chlorine that enters the chlorinating agent mixing tank through the gas inlet of the chlorine injector are mixed to prepare the chlorinating agent; the primary reaction process: 3,5-xylenol and tetrachloroethylene are mixed in the primary reactor , primary circulation pump, primary heat exchanger, and primary ejector, and then mix with the chlorinating agent sucked through the primary ejector and react in the primary reactor; secondary reaction process: will pass through a After the materials obtained in the first-stage reaction process and tetrachlorethylene are circulated between the secondary reactor, the secondary circulation pump, the secondary heat exchanger and the secondary ejector, they are mixed with the sulfuryl chloride inhaled through the secondary ejector and discharged in the secondary reactor. reaction in a reactor. The reaction efficiency for preparing 4-chloro-3,5-dimethylphenol through the process and the device of the present invention is relatively high.

Description

technical field [0001] The invention belongs to the field of 4-chloro-3,5-dimethylphenol chlorination reaction technology, and more specifically relates to a 4-chloro-3,5-dimethylphenol chlorination reaction production efficiency that can effectively improve production efficiency craft. Background technique [0002] 4-Chloro-3,5-dimethylphenol is recognized as a fungicide with high efficiency and spectral safety, and it is the first choice fungicide certified by the US FDA. Wei Wenlong of Taiyuan Ligong University and others mentioned in "Research on the Synthesis of P-Chloroxylenol" that "the demand for sterilization and disinfection in daily life is also increasing day by day, which provides a better and broader market for p-Chloroxylenol ", and also mentioned that "p-chloro-m-xylenol has attracted widespread attention at home and abroad because of its excellent bactericidal and antiseptic functions. Its development prospects are optimistic and its market potential is hug...

AI Technical Summary

Problems solved by technology

But this method still does not solve the recycling of catalyst, and the use problem of organic solvent

[0007] The process of 4-chloro-3,5-dimethylphenol (PCMX) generally uses 3,5-dimethylphenol as raw material, tetrachloroethylene as solvent, and sulfuryl chloride as chlorinating agent. Long cycle (12-16h), repeated cooling and heating operations, serious side effects

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