Novel comprehensive pretreatment method of albendazole high-concentration sulfur-containing wastewater
An albendazole and high-concentration technology is applied in the field of comprehensive pretreatment of novel albendazole high-concentration sulfur-containing wastewater, which can solve the problems of large amount of sulfur-containing wastewater, complex components, secondary pollution and the like
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Embodiment 1
[0018] A comprehensive pretreatment method for high-concentration sulfur-containing wastewater in the production of new albendazole.
[0019] Specific steps are as follows:
[0020] First add 2000mL albendazole high-concentration sulfur-containing wastewater (COD60000mg / L, PH13, sodium sulfide determination 17000mg / L, sodium thiosulfate 8000mg / L, sodium thiocyanate 5000mg / L, sodium sulfite 3000mg / L, sodium sulfate 2000mg Add quantitative ferrous sulfate 33g in / L), filter after reaction, obtain by-product ferrous sulfide 18.5g and filtrate 1, then add copper sulfate 39g to filtrate 1, filter after reaction, obtain by-product thiocyanate ketone 7.5g and filtrate 2, filtrate 2 is cooled to 0 ~ 10 ℃, crystallization, obtain filtrate 3 and filter residue 3, filter residue 3 mainly contains sodium sulfate (Na 2 SO 4 ), after recrystallization, 38 g of by-product sodium sulfate was obtained, and the filtrate 3 mainly contained bromide ions, and bromine could be recovered. process...
Embodiment 2
[0022] A comprehensive pretreatment method for high-concentration sulfur-containing wastewater in the production of new albendazole.
[0023] Specific steps are as follows:
[0024] First add 2000mL albendazole high-concentration sulfur-containing wastewater (COD 60000mg / L, PH 13, sodium sulfide determination 17000mg / L, sodium thiosulfate 8000mg / L, sodium thiocyanate 5000mg / L, sodium sulfite 3000mg / L, sulfuric acid Sodium 2000mg / L), add quantitative ferrous sulfate 33g, filter after reaction, obtain by-product ferrous sulfide 18.5g and filtrate 1, then add copper sulfate 45g to filtrate 1, filter after reaction, obtain by-product thiocyanic acid Subketone 7.5g and filtrate 2, filtrate 2 is cooled to 0 ~ 10 ℃, crystallization, obtain filtrate 3 and filter residue 3, filter residue 3 mainly contains sodium sulfate (Na 2 SO 4 ), after recrystallization, 41 g of by-product sodium sulfate was obtained, and the filtrate 3 mainly contained bromide ions, and bromine could be recover...
Embodiment 3
[0026] A comprehensive pretreatment method for high-concentration sulfur-containing wastewater in the production of new albendazole.
[0027] Specific steps are as follows:
[0028] First add 2000mL albendazole high-concentration sulfur-containing wastewater (COD 60000mg / L, PH 13, sodium sulfide determination 17000mg / L, sodium thiosulfate 8000mg / L, sodium thiocyanate 5000mg / L, sodium sulfite 3000mg / L, sulfuric acid Sodium 2000mg / L), add quantitative ferrous sulfate 39g, filter after reaction, obtain by-product ferrous sulfide 18.5g and filtrate 1, then add copper sulfate 39g to filtrate 1, filter after reaction, obtain by-product thiocyanic acid Subketone 7.5g and filtrate 2, filtrate 2 is cooled to 0 ~ 10 ℃, crystallization, obtain filtrate 3 and filter residue 3, filter residue 3 mainly contains sodium sulfate (Na 2 SO 4 ), after recrystallization, 43 g of by-product sodium sulfate was obtained, and the filtrate 3 mainly contained bromide ions, and bromine could be recover...
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