M-dichlorobenzene production method

Abstract

The invention relates to an m-dichlorobenzene production method. The m-dichlorobenzene production method includes the following steps: mixing benzene with concentrated nitric acid, and performing catalytic reaction by taking the concentrated nitric acid as a catalyst to obtain nitrobenzene; mixing the nitrobenzene with the concentrated nitric acid, and performing secondary catalytic reaction to obtain a mixed nitrobenzene solution; mixing the mixed nitrobenzene solution with sodium hydrogen sulfite and sodium hydroxide, and stirring the mixture to obtain m-dichlorobenzene; injecting chlorine into the m-dichlorobenzene to obtain a coarse m-dichlorobenzene solution; purifying the m-dichlorobenzene solution by hydrophobic silicon zeolite molecular sieves; performing crystallization, rectification, purification and secondary chlorination to obtain pure m-dichlorobenzene; finally condensing the pure m-dichlorobenzene to obtain a finished product, and collecting the finished product. The m-dichlorobenzene production method has the advantages that the benzene is taken as a raw material, the m-dichlorobenzene product with high purity is produced after two times of nitration and repetition of chlorination, the steps of the whole method are simple, requirements on production equipment are low, and the method is suitable for production and application of small and medium enterprises.

Description

technical field [0001] The invention relates to a method for producing organic matter, in particular to a method for producing m-dichlorobenzene. Background technique [0002] m-dichlorobenzene is a colorless liquid with a pungent odor, insoluble in water, soluble in alcohol and ether. It can carry out chlorination, nitration, sulfonation and hydrolysis reactions, and reacts violently with aluminum. Nowadays, the commonly used method of producing m-dichlorobenzene is mainly to use benzene as a raw material, directly carry out the chlorination process, and then undergo crystallization and rectification to produce m-dichlorobenzene. Due to the limitation of production methods and equipment Limitations, the purity of m-dichlorobenzene usually obtained is low, and the equipment cost is high, so it is not suitable for small and medium-sized factories to produce. Contents of the invention [0003] The technical problem to be solved by the embodiments of the present invention i...

AI Technical Summary

Problems solved by technology

Nowadays, the commonly used method of producing m-dichlorobenzene is mainly to use benzene as a raw material, directly carry out the chlorination process, and then undergo crystallization and rectification to produce m-dichlorobenzene. Due to the limitation of production methods and equipment Limitation, the purity of m-dichlorobenzene usually obtained is low, and the equipment cost is high, so it is not suitable for small and medium-sized factories to produce

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