Wastewater treatment process for paranitrobenzoyl chloride

Abstract

The invention provides a wastewater treatment process for paranitrobenzoyl chloride. The process comprises the following steps: adding a toluene solution into a reaction vessel, and introducing phosgene into the reaction vessel; dropwise adding paranitrobenzoic acid into the reaction vessel; introducing nitrogen gas into the solution in the reaction vessel for gas purging; transferring the solution subjected to gas purging into a rectifying still; and filtrating the cooled solution, and adding water into filtrated residue for flushing. The process has the beneficial effects that by adopting the production process, waste liquid can be further treated, and the product can be partially recovered, so that environmental pollution caused by direct discharge is avoided, and meanwhile, the yield of the product is increased.

Description

technical field [0001] The invention relates to the field of plastic fine chemical production, in particular to a waste water treatment process of p-nitrobenzoyl chloride. Background technique [0002] p-Nitrobenzoyl chloride is a medical raw material used to prepare procaine hydrochloride, p-aminobenzoyl glutamic acid and folic acid, etc.; it can be used as a dye raw material to prepare direct dye brown 100 for leather and paper; It can be used to make acid dyes, food additives (milk powder conditioners), color developing agents and organic synthesis intermediates, identification of alcohols, phenolic reagents, etc. [0003] p-Nitrobenzoyl chloride is an important intermediate in the synthesis of folic acid, procaine hydrochloride, N-p-aminobenzoyl-L-glutamic acid and other vitamin pharmaceutical products, and is also widely used in the production of pigments and color developers . Especially in recent years, with the rise of the feed industry and the development of the i...

AI Technical Summary

Problems solved by technology

There are certain deficiencies in the existing several preparation methods: as phosgene and phosphorus oxychloride are highly toxic substances, it is easy to cause harm to personnel safety and the environment; phosphorus pentachloride is a solid, and it is necessary to add a solvent to accelerate the reaction, which is easy Increase impurities and separation operations; when thionyl chloride is used as the chlorination agent, the reaction time is longer, and column distillation is required to remove impurities, increasing energy consumption, etc.

[0005] After production, it is easy to generate waste liquid and discharge it directly, which will cause environmental solution, and the solution is difficult to degrade