Method for treating wastewater generated from fabricating nitrophenol as well as for reclaiming and using resources

Abstract

The prodn. process are: pretreatment, adsorpting adsorpting para-nitrophenol in waste water, recovering and utilizing sodium chloride, deadsorpting obsorbed para-nitrophenol. The outstanding characteristic is that recovering ratio for nitrophenol is approach 100 percent, the recovered nitrophenol is reused by being send back to prodn process, large quantity of sodium chloride in waste water is used to produce caustic soda and hydrochloric which can be circulating used.

Description

1. Technical field

[0001] The invention relates to a method for treating p-nitrophenol production wastewater discharged from industries such as fine chemical industry and pharmaceutical industry and recycling resources. 2. Background technology

[0002] p-Nitrophenol is an important medicine, pesticide and dye intermediate. One of its production processes is to synthesize p-nitrochlorobenzene through hydrolysis-acidification and other reactions. p-Nitrophenol is a priority pollutant in water pollution control in my country. The pH value of p-nitrophenol production wastewater is generally 1 to 2, and the COD Cr (Chemical oxygen content) 10000-15000mg / L, p-nitrophenol 3000-8000mg / L, sodium chloride mass concentration 14-15%. The treatment methods for high-concentration p-nitrophenol wastewater mainly include chemical oxidation, extraction, and adsorption. At present, the extraction method is mostly used, but after multi-stage extraction, the concentration of p-nitrophenol ...