Application of anti-isomer additive in 2,5-dichloronitrobenzene production nitration reaction

Abstract

The invention relates to application of an anti-isomer additive in 2,5-dichloronitrobenzene nitration reaction. A method for preparing 2,5-dichloronitrobenzene comprises the following steps: dropwise adding an anti-isomer additive into a kettle containing p-dichlorobenzene for nitration reaction, and carrying out standing insulation for 0.5 hour after the reaction is completed, thereby obtaining crude 2,5-dichloronitrobenzene; then, cleaning by using water, cleaning by using alkali, and separating, thereby obtaining pure 2,5-dichloronitrobenzene, wherein the anti-isomer additive is a mixture of 98% concentrated sulfuric acid and 98% concentrated nitric acid which are of the same volume, and the dosage of the anti-isomer additive is 2% the weight of p-dichlorobenzene. The method has the advantages that the anti-isomer additive applied to the 2,5-dichloronitrobenzene nitration reaction is not subjected to oxidation side reaction, so that the production of toxic and harmful byproducts is reduced from the source, the environmental pollution is little, the aim of clean production is achieved, the purity of the obtained product is high, the production cost and energy consumption are reduced, and the production efficiency is increased.

Description

technical field [0001] The invention relates to an application method of an anti-isomer additive in the nitration reaction of producing 2,5-dichloronitrobenzene. Background technique [0002] 2,5-Dichloronitrobenzene, as a nitrogen fertilizer synergist, has the effect of nitrogen fixation and fertilizer preservation, and can also be used as an intermediate for dyes, pesticides, and antioxidants. In the dye industry, it is used for ice dyeing dyes such as GG, 3GL, RC, etc. It can also be used as a dye intermediate for the preparation of 2,5-dichloroaniline. In the pesticide industry, it is used as a pesticide intermediate, and is an intermediate of the herbicides dicamba and quizalofop. 2,5-Dichloronitrobenzene is also the main raw material for the synthesis of antibacterial agent triclosan, therefore, the domestic production of 2,5-Dichloronitrobenzene has a broad market prospect. [0003] The nitration reaction of 2,5-dichloronitrobenzene is a chemical unit reaction, whic...

AI Technical Summary

Problems solved by technology

The use of the above additives produces N during the production process 2 O, NO 2 Such harmful gases lead to serious environmental pollution, resulting in high treatment costs, and by-products such as nitrification and oxidation during the reaction process, resulting in serious safety hazards