Method for treating metronidazole waste water
A treatment method, metronidazole technology, applied in the field of metronidazole wastewater treatment, can solve the problems that many useful substances have not been effectively recycled, and achieve the effects of preventing pollution, saving raw materials, and mild reaction conditions
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Embodiment 1
[0023] Take 1200ml of centrifuged wastewater of crude metronidazole, put it in a 2L flask, spin evaporate to the remaining 400ml of solution, crystallize at a temperature of 55°C, filter to obtain anhydrous sodium sulfate and sodium formate, and dry to obtain 106.3g. The filtrate was adjusted to pH = 5 with sulfuric acid to precipitate 9 g of nitrates, stirred at room temperature, filtered and dried. Then the filtrate was concentrated by rotary evaporation to 280g viscous solution, added 280g of anhydrous methanol and reacted at 40°C for 1.5 hours, filtered to obtain anhydrous sodium sulfate and sodium formate, and dried to obtain 145g. Two times of anhydrous sodium sulfate and sodium formate were combined (the content of sodium formate was analyzed to be 37.42%), and 70g of formic acid with a content of 88% was added to dissolve it, and then 73g of concentrated sulfuric acid was slowly added for reaction. After the reaction, the reaction temperature was maintained at 100 ℃ fo...
Embodiment 2
[0025] Take 1200ml of centrifuged wastewater of crude metronidazole, put it in a 2L flask, spin evaporate until the remaining 300ml of solution, crystallize at 45°C, filter the concentrate to obtain anhydrous sodium sulfate and sodium formate, and dry to obtain 115g. The filtrate was adjusted to pH = 3 with sulfuric acid to precipitate 8 g of nitrates, stirred at room temperature, filtered and dried. Then the filtrate was concentrated by rotary evaporation to 271g viscous solution, and 406.5g of anhydrous methanol was added to react at 30°C for 2 hours, then filtered to obtain anhydrous sodium sulfate and sodium formate, and dried to obtain 145g. The twice anhydrous sodium sulfate and sodium formate are combined (the content of sodium formate is analyzed to be 37.69%), first add 80g of formic acid with a content of 88% to dissolve it, then slowly add 77g of concentrated sulfuric acid to react, and maintain the reaction temperature at 60°C after the reaction. After reacting at ...
Embodiment 3
[0027] Take 1200ml of metronidazole crude centrifuged waste water, put it in a 2L flask, spin evaporate to the remaining 240ml of solution, crystallize at a temperature of 100°C, filter the concentrate to obtain anhydrous sodium sulfate and sodium formate, and dry to obtain 124g. The filtrate was adjusted to pH = 6 with sulfuric acid to precipitate 10 g of nitrates, stirred at room temperature, filtered and dried. Then the filtrate was concentrated by rotary evaporation to 260g viscous solution, and 650g of anhydrous methanol was added to react at 50°C for 0.5 hours, then filtered to obtain anhydrous sodium sulfate and sodium formate, and dried to obtain 143g. Twice of anhydrous sodium sulfate and sodium formate are combined (analyzing the content of sodium formate is 38.11%), first adding 90g content is 88% formic acid to make it dissolve, then slowly add the concentrated sulfuric acid reaction of 80g, after the reaction, maintain the reaction temperature at React at 120°C fo...
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