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A treatment method for double-effect condensed water in metronidazole wastewater

A treatment method, the technology of metronidazole, is applied in the field of double-effect condensate treatment, which can solve the problems of double-effect condensate without treatment, and achieve the effects of rapid and effective treatment, mild reaction conditions and low price

Active Publication Date: 2019-03-08
HUBEI HONGYUAN PHARMA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims at the problem that the double-effect condensed water in the existing metronidazole production process is not treated, and provides a treatment method for the double-effect condensed water in the metronidazole wastewater, which can remove about 75% of the metronidazole wastewater treatment process. % of condensate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Take 200ml of centrifuged waste water centrifuged three times in the metronidazole production process, cool to -5°C, centrifuge, and separate solid and liquid to remove 20g of colorless crystals in the mother liquor. After testing, the colorless crystals are sodium pentahexasulfate crystals; The centrifuged waste water of nitrazole three times is processed by vacuum distillation; the mother liquor is taken by vacuum distillation, the vacuum degree is controlled at -0.075MPa, and the water bath temperature is 90°C and vacuum distillation is carried out until the distillate V1=120ml; Adjust the distillate to pH=3, and add 10ml of H 2 o 2 , and then pass into O 3 , after standing for 30min; here O 3 The feeding time is 40min, and the feeding speed is 160mg / min; the hydrogen peroxide is a hydrogen peroxide solution with a mass fraction of 28% to 30%; the obtained mixed solution is reserved for the next step; here concentrated sulfuric acid is 98% sulfuric acid;

[0029]...

Embodiment 2

[0031] Take 200ml of centrifuged waste water centrifuged three times in the metronidazole production process, cool to -3°C, centrifuge, and separate solid and liquid to remove 18g of colorless crystals in the mother liquor. After testing, the colorless crystals are sodium pentahexasulfate crystals; The centrifuged waste water of nitrazole three times is processed by vacuum distillation; the mother liquor is taken by vacuum distillation, the vacuum degree is controlled at -0.075MPa, and the water bath temperature is 60°C and vacuum distillation is carried out until the distillate V1=120ml; Adjust the distillate to pH=3, and add 4ml of H 2 o 2 , and then pass into O 3 , after standing for 30min; here O 3The duration of feeding is 30min, and the speed of feeding is 120mg / min; hydrogen peroxide is a hydrogen peroxide solution with a mass fraction of 30%; the mixed solution obtained is reserved for the next step; Add 10g of iron powder and 10g of activated carbon in the total ma...

Embodiment 3

[0033] Take 200ml of centrifuged waste water centrifuged three times in the metronidazole production process, cool to -4°C, centrifuge, and separate solid and liquid to remove 19g of colorless crystals in the mother liquor. After testing, the colorless crystals are sodium pentahexasulfate crystals; The centrifuged waste water of nitrazole three times is processed by vacuum distillation; the mother liquor is taken by vacuum distillation, the vacuum degree is controlled at -0.080MPa, and the water bath temperature is 90°C and vacuum distillation is carried out until the distillate V1=135ml; Adjust the distillate to pH=3, and add 7ml of H 2 o 2 , and then pass into O 3 , after standing for 30min; here O 3 The duration of feeding is 30min, and the feeding speed is 140mg / min; Hydrogen peroxide is a hydrogen peroxide solution with a mass fraction of 30%; Add 13g of iron powder and 13g of activated carbon in the total mass of waste water to the mixed solution, filter after stirrin...

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Abstract

The invention belongs to the technical field of industrial wastewater treatment and recovery and relates to a treatment method of double-effect condensate water in metronidazole wastewater. The method comprises steps as follows: centrifugal wastewater obtained through three times of centrifugation in the production process of metronidazole is centrifuged at the reduced temperature; a centrifuged mother solution is distilled under the reduced pressure, and distillate is obtained; the PH of the distillate is adjusted to be 3 with sulfuric acid, H2O2 and O3 are sequentially added, iron powder and activated carbon are added, stirred and then filtered after a reaction ends, and the PH is adjusted to be 3; FeSO4 is added, H2O2 is added after FeSO4 is completely dissolved, and filtering is performed; a potassium dichromate solution is added to filtrate and mixed uniformly, a AgSO4-H2SO4 solution is added and mixed uniformly, and degradation is performed at the temperature of 165 DEG C for 15 min. About 75% of condensate water in the metronidazole wastewater treatment process can be removed.

Description

technical field [0001] The invention relates to a method for treating double-effect condensed water in metronidazole wastewater, which belongs to the treatment and recovery of industrial wastewater. Background technique [0002] With the development of the chemical and pharmaceutical industry, the treatment costs of a large amount of wastewater generated by chemical and pharmaceutical companies in production have become one of the important production costs of the company. Due to the need to use a variety of raw materials in the process of pharmaceutical and chemical production, and the composition of wastewater is extremely complex, pharmaceutical wastewater has become one of the more difficult wastewater to treat. Especially [unclear] organic wastewater containing high salt, high chroma, refractory substances and other biotoxins produced during the production of antibiotics. [0003] Metronidazole is a relatively cheap antibiotic raw material in the pharmaceutical industr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C02F101/34C02F103/34
CPCC02F1/00C02F1/04C02F1/22C02F1/38C02F1/46176C02F1/66C02F1/722C02F1/78C02F9/00C02F2101/34C02F2103/343
Inventor 方耀徐双喜晏浩哲喻莎莎方高丰光俊
Owner HUBEI HONGYUAN PHARMA