Wastewater treatment process for paranitrobenzoyl chloride

A technology for nitrobenzoyl chloride and wastewater treatment, which is applied in multi-stage water treatment, natural water treatment, heating water/sewage treatment, etc. It can solve the problems of increased energy consumption, difficulty in degrading solutions, personnel safety and environmental hazards, etc. problems, to avoid environmental pollution and increase production

Inactive Publication Date: 2016-03-09
ANHUI GUANGXIN AGROCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] First add toluene solution into the reaction kettle, pass phosgene into the reaction kettle, and continue to pass through phosgene at the same time; add p-nitrobenzoic acid dropwise into the reaction kettle, stir while adding, and pass light Gas, and the feed rate of phosgene is 1.0L / s, until the pH value of extraction solution is 8, stop stirring, and stop feeding phosgene, phosgene can be dissolved in the toluene solution, can increase phosgene and The reaction efficiency of the remaining reactants is high, and the danger of explosion caused by direct reaction is avoided. The dropping reaction improves the reaction efficiency, reduces the generation of side reactions, and the reaction is very easy to control;

[0023] Then feed the solution in the reaction kettle with nitrogen gas to catch the air, and the amount of nitrogen gas introduced is 0.5L / s, and the reaction kettle is continuously stirred, which can drive out the tail gas in the reaction product, improve the p...

Embodiment 2

[0028] First add toluene solution into the reaction kettle, pass phosgene into the reaction kettle, and continue to pass through phosgene at the same time; add p-nitrobenzoic acid dropwise into the reaction kettle, stir while adding, and pass light Gas, and the feed rate of phosgene is 1.1L / s, until the pH value of extraction solution is 9, stop stirring, and stop feeding phosgene, phosgene can be dissolved in the toluene solution, can increase phosgene and like this The reaction efficiency of the remaining reactants is high, and the danger of explosion caused by direct reaction is avoided. The dropping reaction improves the reaction efficiency, reduces the generation of side reactions, and the reaction is very easy to control;

[0029] Then feed the solution in the reaction kettle with nitrogen gas to expel the gas, and the amount of nitrogen gas introduced is 0.6L / s, and the reaction kettle is continuously stirred, which can drive out the tail gas in the reaction product, imp...

Embodiment 3

[0034] First add toluene solution into the reaction kettle, pass phosgene into the reaction kettle, and continue to pass through phosgene at the same time; add p-nitrobenzoic acid dropwise into the reaction kettle, stir while adding, and pass light Gas, and the feed rate of phosgene is 1.2L / s, until the pH value of extraction solution is 10, stop stirring, and stop feeding phosgene, phosgene can be dissolved in the toluene solution, can increase phosgene and like this The reaction efficiency of the remaining reactants is high, and the danger of explosion caused by direct reaction is avoided. The dropping reaction improves the reaction efficiency, reduces the generation of side reactions, and the reaction is very easy to control;

[0035] Then pass the solution in the reaction kettle into nitrogen to catch the air, and the amount of nitrogen gas introduced is 0.8L / s, and the reaction kettle is continuously stirred, which can drive out the tail gas in the reaction product, improv...

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PUM

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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...

Claims

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Application Information

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IPC IPC(8): C07C201/12C07C205/57C02F9/10C02F103/36
CPCC07C201/12C02F1/001C02F1/04C02F1/20C02F9/00C02F2103/36C02F2301/08
Inventor 过学军胡安胜吴建平高焰兵戴玉婷张军刘长庆徐小兵黄显超朱张
Owner ANHUI GUANGXIN AGROCHEM
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