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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

Active Publication Date: 2016-09-21
河南豫辰药业股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The sulfur-containing wastewater produced by albendazole production has a large amount of water, complex components, high sulfur content in sulfide, serious pollution to the surrounding environment, and difficult treatment. At present, the methods for treating sulfur-containing wastewater at home and abroad mainly include oxidation method and alkali absorption method. , steam stripping method, precipitation method, Claus method, membrane separation method and biochemical method, etc., but these methods have high energy consumption, a large demand for chemicals, a large investment in equipment, and the need to reprocess end products such as sediment, so the cost is relatively high. Therefore, it is an urgent problem to be solved today to find a comprehensive pretreatment method for high-concentration sulfur-containing wastewater that is efficient, economical, fast, and has low requirements on equipment and processes, and to effectively recover by-products.
[0005] The purpose of the present invention is to solve the problems of high treatment cost and harsh treatment conditions of high-concentration sulfur-containing wastewater in the production of albendazole, and provide a kind of high-efficiency, fast, low requirements on equipment and process, high removal efficiency, effective recovery of by-products, Comprehensive pretreatment method for high-concentration sulfur-containing wastewater to avoid secondary pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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PUM

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Abstract

The invention relates to a novel comprehensive pretreatment method of high-concentration sulfur-containing wastewater in albendazole production and aims to solve the problem that high-concentration sulfur-containing wastewater in albendazole production is high in treatment cost and harsh in treatment condition. Albendazole high-concentration sulfur-containing wastewater mainly contains sulfur-containing compounds like sodium sulfide (Na2S), sodium thiosulfate (Na2S2O3), sodium thiocyanate (NaSCN), sodium sulfite (Na2SO3) and sodium sulfate (Na2SO4), sodium bromide (NaBr) and a small amount of organic impurities. The method includes: adding a fixed quantity of ferrous sulfate into the high-concentration sulfur-containing wastewater, and filtering after reaction to obtain byproducts ferrous sulfide and filtrate 1; adding copper sulfate into the filtrate 1, and filtering after reaction to obtain byproducts cuprous thiocyanate and filtrate 2; cooling the filtrate 2 to 0-10 DEG C, crystallizing to obtain filtrate 3 and filter residue 3 which mainly contains sodium sulfate (Na2SO4), and recrystallizing to obtain a byproduct anhydrous sodium sulfate, and entering wastewater after bromine is recycled, wherein the filtrate 3 mainly contains bromide ions and recyclable bromine. The pretreatment method is mild in reaction condition, low in equipment requirement, good in treatment effect, simple and convenient to operate, capable of recycling byproducts, low in treatment cost and convenient for industrial application.

Description

technical field [0001] The invention belongs to the technical field of sulfur-containing wastewater treatment, and in particular relates to a novel comprehensive pretreatment method for high-concentration albendazole-containing sulfur-containing wastewater. Background technique [0002] Albendazole is a high-efficiency broad-spectrum anthelmintic, which has a significant control effect on pinworms, nematodes, roundworms and other parasites in warm-blooded animals such as dogs and sheep. Insect disease, low toxicity to human body and animals, and small side effects. At present, o-nitroaniline is mainly synthesized with o-nitroaniline as a starting material at home and abroad, that is, o-nitroaniline undergoes thiocyanation reaction, alkylation reaction, reduction reaction, and ring reaction. Albendazole is prepared by the combination reaction, but there is a large amount of sulfur-containing wastewater in the sodium sulfide reduction step, and the pressure on environmental pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F103/34C02F101/10C02F101/12
CPCC02F1/52C02F1/5236C02F9/00C02F2001/5218C02F2101/101C02F2101/12C02F2103/343
Inventor 段玉强石艳彩王心久杨晶晶王瑞菊付影敢
Owner 河南豫辰药业股份有限公司
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