Novel continuous nitrification denitrating, abstraction, hydrogenation reduction production process for H acid

Abstract

The present invention relates to a novel technology of continuous nitration and denitration, extraction, hydrogenation and reduction of H acid, and belongs to the technical field of H acid production. In the novel technology, H acid is prepared with liquid naphthalene through sulfonation, continuous nitration and denitration, extraction, hydrogenation and reduction, concentration, alkali fusion and separation of the H acid. The present invention not only solves the problems in the traditional technological process that the steps are more, the process is complex, the labor intensity of workers is high, the yield rate of the H acid is low and the pollution of wastewater is serious, but also eliminates the factors that the slightly inaccurate control over the reaction temperature and time of nitration and denitration can easily cause explosive polynitro compounds and thus hidden danger of security. The present invention has the advantages that the process is shortened, the byproducts are fewer, and the labor intensity is reduced. The continuous nitration and denitration has the advantages that the occupied area is small, the production capacity is high, the energy consumption is low, the yield rate is improved by 8 percent compared with the traditional process, about 1 ton of sulphuric acid is saves in production of one ton of the product, and the wastewater discharge is reduced. No iron ions are contained in the materials, the product quality of the H acid is improved, and the workshop production environment is obviously better.

Description

Technical field: [0001] The invention relates to a new production process of continuous nitration and denitrification, extraction and hydrogenation reduction of H acid, which belongs to the technical field of H acid production. Background technique: [0002] H acid is a special intermediate for the manufacture of dyes, widely used in printing and dyeing, textile, chemical and other industries. The existing production process is: sulfonation of refined naphthalene→nitration→denitration→neutralization→iron powder reduction→iron slime pressure filtration→T acid separation→T acid filtration→dehydration→low pressure alkali fusion→H acid separation. The production process is long, with many steps, complicated process, high labor intensity of workers, low yield of H acid, serious pollution of iron sludge and various waste water, and the reaction temperature and time of nitrification and denitrification are slightly inaccurate. It is easy to generate explosive polynitro compounds, ...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to: provide a method to solve the problems of many steps in the production process of the traditional process, the process is complicated, the labor intensity of the workers is high, the yield of H acid is low, and the waste water is seriously polluted; →Hydrogenation and reduction→alkali fusion→New technology for producing H acid by separating H acid; shortening the process flow, avoiding many by-products, and reducing labor intensity of continuous nitration and denitration, extraction, and hydrogenation reduction production of H acid