Production method of highly pure 2,4-dinitrochlorobenzene

Abstract

A production method of highly pure 2,4-dinitrochlorobenzene relates to the technical field of the chemical industry. The method comprises the following steps: adding a nitric acid and sulfuric acid mixed acid into a nitration kettle, adding p-chloronitrobenzene in a dropwise manner, heating the nitration kettle to 105DEG C, stopping stirring, allowing the obtained material to stand for layering, adding a waste acid into an extraction pot, adding p-nitrochlorobenzene into the extraction after the extraction in order to react with residual nitric acid in the waste acid, extracting organic matters in the extracted acid, allowing the obtained solution to stand for layering, inputting the waste acid into a concentration workshop section, concentrating, mechanically using, recovering the extracted p-nitrochlorobenzene as a next batch nitration material, adding a qualified nitrated liquid from the nitration kettle into a neutralization water washing pot, adding Na2CO3.10H2O, washing to neutrality, stopping stirring, and allowing the obtained solution to stand for layering in order to obtain a finished product. The method has the advantages of simple and convenient preparation, small waste acid output, less equipment investment, high out degree and convenient operation, and the prepared 2,4-dinitrochlorobenzene has the advantages of good use effect, safety and reliability.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a production method of high-purity 2,4-dinitrochlorobenzene. Background technique [0002] 2,4-Dinitrochlorobenzene is an important organic chemical intermediate product, which is widely used in medicine, dyestuff, pesticide, photographic aid and other industries. There are hundreds of derivative products with high added value. In recent years, the development of the chemical industry has put higher and higher requirements on the quality of chemicals. The pharmaceutical and advanced dye industries require the purity of 2,4-dinitrochlorobenzene to be over 99.5%, and the crystallization point to be 48.5°C. The sales situation of high-purity products is good, and the profit margin of products is relatively large. In recent years, many domestic manufacturers of 2,4-dinitrochlorobenzene have invested in research and development and process transformation, but due to variou...

AI Technical Summary

Problems solved by technology

In recent years, many domestic manufacturers of 2,4-dinitrochlorobenzene have invested in research and development and process transformation, but due to various reasons, so far, the products produced have reached the quality requirements of high-quality products, basically zero; 2,4 -The synthetic method of dinitrochlorobenzene mainly contains following process route at home at present: a route is chlorobenzene dinitration method, and chlorinated benzene and mixed acid carry out nitration reaction in nitration kettle, and nitration liquid reacts with mixed acid again, and reaction solution passes through Post-processing, this route is relatively mature, but the product quality is not very satisfactory

The content can only reach about 95%; another route is to use the by-product eutectic oil (i.e. low oil) during the production of p- and o-nitrochlorobenzene to form through mixed acid nitration, neutralization and washing, and the product quality of this route is poor

The 2,4-dinitrochlorobenzene produced by these two routes is of poor quality, so its downstream products can only be made into some traditional chemical intermediates, traditional dyes, pesticides, etc., and the market is limited