Method for harnessing and recovering producing waste water of cyadox

A technology of cydox and recovery solution, which is applied in the direction of heating water/sewage treatment, organic chemistry, etc., can solve the problems of no patents and relevant literature reports on recycling methods, and reduce the difficulty of treatment, with obvious and good effects Effect

Inactive Publication Date: 2011-02-16
HUAZHONG AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there are no patents and relevant literature reports on the treatment of quincydox production wastewater and its recycling methods

Method used

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  • Method for harnessing and recovering producing waste water of cyadox
  • Method for harnessing and recovering producing waste water of cyadox
  • Method for harnessing and recovering producing waste water of cyadox

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Take 400mL of intermediate waste liquid, 200mL of methanol washing liquid, 500mL of cydox waste liquid and 200mL of absolute ethanol washing liquid respectively, and add them to a 1000mL round bottom flask, carry out vacuum distillation on a rotary evaporator, and the temperature gradually rises from room temperature to At 90°C, the pressure was controlled at 0.9MPa, and the recoveries reached 61.3%, 95.5%, 91.8% and 95.0%, respectively.

[0035] Take 2kg of the waste liquid distillation product, put it into the incinerator, ignite it electronically, and incinerate in about 3 minutes. The exhaust gas emission reaches the national standard. Collect about 70g of ash residue and landfill it according to the national standard.

[0036]Add 50mL of hydrazine hydrate and 60mL of cyanoacetylhydrazine waste liquid into a 500mL four-necked reaction flask equipped with a conventional electric stirrer, thermometer and dropping funnel, and slowly add 70mL of ethyl cyanoacetate dropwi...

Embodiment 2

[0041] Take 400mL of intermediate waste liquid, 200mL of methanol washing liquid, 500mL of cydox waste liquid and 200mL of absolute ethanol washing liquid respectively, and add them to a 1000mL round bottom flask, carry out vacuum distillation on a rotary evaporator, and the temperature gradually rises from room temperature to At 97°C, the pressure was controlled at 0.1MPa, and the recoveries reached 62.3%, 96.5%, 93.4% and 95.6%, respectively.

[0042] Take 5kg of the waste liquid distillation product, put it into the incinerator, ignite it electronically, and incinerate in about 7 minutes. The exhaust gas emission meets the national standard. About 167g of ash residue is collected and landfilled according to the national standard.

[0043] Add 50mL of hydrazine hydrate and 110mL of cyanoacetylhydrazine waste liquid into a 500mL four-necked reaction flask equipped with a conventional electric stirrer, thermometer and dropping funnel, and slowly add 120mL of ethyl cyanoacetate ...

Embodiment 3

[0048] Take 500mL of intermediate waste liquid, 300mL of methanol washing liquid, 500mL of quincydox waste liquid and 300mL of absolute ethanol washing liquid and add them to a 1000mL round bottom flask respectively, carry out vacuum distillation on a rotary evaporator, and the temperature gradually rises from room temperature to At 95°C, the pressure was controlled at 0.097MPa, and the recoveries reached 63.5%, 96.3%, 93.6% and 95.8%, respectively.

[0049] Take 10kg of the waste liquid distillation product, put it into the incinerator, ignite it electronically, and incinerate in about 15 minutes. The exhaust gas emission meets the national standard. Collect about 329g of ash residue and landfill it according to the national standard.

[0050] Add 50mL of hydrazine hydrate and 80mL of cyanoacetylhydrazide waste liquid into a 500mL four-necked reaction flask equipped with a conventional electric stirrer, thermometer and dropping funnel, and slowly add 100mL of ethyl cyanoacetat...

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Abstract

The invention belongs to a method for the treatment and recovery of cyadox (2 - carbamoyl cyano acetyl hydrazone - quinoxaline -1,4-dioxide) production wastewater. The invention adopts the vacuum distillation method to recover the vast majority of production of useful substances in the cyadox production wastewater and makes use of the useful substances in the production process; the cyadox purityreaches over 98% and the yield reaches 53% so as to greatly reduce the production cost of cyadox; the invention uses the incineration method to burn the distillation residues without recycling value,with the volume reduction ratio up to 96% and the exhaust emission reaching the national emission standards; the invention also uses the UV / Fenton oxidation method to treat the cyadox lotion, wherein, the COD removal rate is over 98% and reaches the first level of national emission standards, so the wastewater cyadox after treatment can be safely discharged into the environment. The invention has simple equipment and is easy to operate and implement; the method treats and recycles the cyadox wastewater to achieve clean production and recycling of resources, in line with the requirement of China in building environment-friendly and resource-saving society.

Description

technical field [0001] The invention relates to the treatment and recycling method of quinocedo production wastewater. Specifically, it is the recycling and utilization of waste water in the production process of cydox and the comprehensive treatment method of waste. Background technique [0002] At present, with the deterioration of the natural environment and the increase in the discharge of pharmaceutical wastewater, countries all over the world are actively researching and exploring green, economical and effective pharmaceutical wastewater treatment methods. Due to the characteristics of high concentration, high toxicity, deep color and difficult biochemical properties of pharmaceutical wastewater, so far, there is no particularly effective method for its treatment in various countries, and most of them use physical, chemical, biological or a combination of several treatment methods. Use to process. Countries spend a lot of manpower, material and financial resources on...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D241/52C02F1/04
Inventor 袁宗辉邱荣超陶燕飞王玉莲黄玲利陈冬梅彭大鹏戴梦红刘振利谢长清王旭刘志亮斯琴朝克图李荣强
Owner HUAZHONG AGRI UNIV
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