Continuous process and device for the separation of benzyl chloride regular packing column

Abstract

The invention relates to a refining separation device for benzyl chloride serial, comprising a toluene distillation column and a benzyl chloride distillation column; the invention is characterized in that the toluene distillation column and the benzyl chloride distillation column are both structured packing columns. The two columns are both provided with a secondary condenser; one end of the secondary condenser is connected with an outlet at the top column after connected in series and the other end of the secondary condenser is connected with a reflux tank. The reflux tank is connected with a vacuum device and the bottom of the tower is provided with a reboiler. The device adopts the serial technique of two structured packing columns and negative pressure operation. Simultaneously when the highly purified benzyl chloride is produced, the toluene which is not completely reacted can be fully recycled. The continuous technique adopted by the invention has the advantages of stable material discharging, short staying time of material in the column, stable product quality, low unit energy consumption, operation time reducing and great production capacity. The theoretical plate number of the structured packing columns is high; the material discharging needs a smaller reflux ratio; the needed energy consumption is low and the production cost is reduced greatly.

Description

technical field [0001] The invention relates to the field of fine chemical separation technology, in particular to a continuous separation method and device for a benzyl chloride structured packing tower. Background technique [0002] Benzyl chloride, also known as benzyl chloride and toluene chloride, is a colorless and transparent liquid, miscible with chloroform, alcohol and ether, insoluble in water, and has an unpleasant pungent odor. It is an important intermediate of medicines, dyes, pesticides, synthetic fragrances, plasticizers and surfactants. Hundreds of useful chemicals can be synthesized from benzyl chloride. [0003] Benzyl chloride is obtained by direct chlorination of phenyl side chains. Due to the different control and production methods of various manufacturers, the main by-products are dichlorobenzyl and trichlorobenzyl; if the conditions are not well controlled, there will be o-chlorobenzyl Benzyl chloride and benzyl chloride produce, increasing the sepa...

AI Technical Summary

Problems solved by technology

Among the above four methods, the glass column series continuous chlorination method and the tank type light chlorination method are batch production methods of intermittent chlorination and intermittent distillation, which have the advantages of stable quality and easy control, but small production capacity and low efficiency The stripping chlorination method and rectification chlorination method are continuous production methods, but due to the influence of factors such as poor corrosion resistance of domestic equipment materials and unqualified automatic control hardware, product quality often has problems

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