Method for cooperatively treating nitrobenzene wastewater by coal water slurry technology

A technology for nitrobenzene wastewater and synergistic treatment, which is applied in the fields of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. The increase in maintenance times and the increase in the corrosion of coal slurry can reduce the risk of unplanned shutdowns, reduce inspection and maintenance costs, and solve corrosion problems.

Pending Publication Date: 2022-07-22
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the actual production process of co-processing nitrobenzene wastewater with coal-water slurry technology, due to the high salt content and complex composition of nitrobenzene wastewater, the corrosiveness of coal slurry increases, resulting in a series of corrosion-induced problems in mills and other equipment. Production problems, such as increased slurry leakage at the joints of cylinder bolts, increased equipment maintenance times, etc., seriously restricted the continuous and stable operation of the coal gasification plant
Patents CN 213611731U, CN 112814988A, etc. have proposed corresponding solutions on the improvement of mill equipment, but they often treat the symptoms rather than the root cause, and the corrosion problem has not been effectively solved

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  • Method for cooperatively treating nitrobenzene wastewater by coal water slurry technology
  • Method for cooperatively treating nitrobenzene wastewater by coal water slurry technology
  • Method for cooperatively treating nitrobenzene wastewater by coal water slurry technology

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] The present embodiment provides a method for co-processing nitrobenzene wastewater with coal-water slurry technology, which comprises the following steps:

[0058] After the nitrobenzene wastewater is deoxygenated, the pH is adjusted, and then the deoxygenated nitrobenzene wastewater is passed into a reactor containing iron fillers for reaction, and then the pH of the reacted nitrobenzene wastewater is adjusted, and finally mixed with coal. , Additives complete pulping in the mill.

[0059] The pH of the nitrobenzene wastewater was adjusted to 3 after the deoxidation treatment, the iron-containing filler was sintered iron-carbon filler, the molar ratio of sintered iron-carbon and nitrite was 2:1, and the pH of the reacted nitrobenzene wastewater was adjusted is 7.

[0060] Table 1 is the molar ratio of different sintered iron carbon and nitrite in the nitrobenzene wastewater by the coal-water slurry technology in Example 1, and the change data of the nitrous acid conte...

Embodiment 2

[0065] The present embodiment provides a method for co-processing nitrobenzene wastewater with coal-water slurry technology, which comprises the following steps:

[0066] After the nitrobenzene wastewater is deoxygenated, the pH is adjusted, and then the deoxygenated nitrobenzene wastewater is passed into a reactor containing iron fillers for reaction, and then the pH of the reacted nitrobenzene wastewater is adjusted, and finally mixed with coal. , Additives complete pulping in the mill.

[0067] Wherein, after the deoxidation treatment, the pH of the nitrobenzene wastewater is adjusted to 3, the iron-containing filler is sponge iron filler, the molar ratio of sponge iron and nitrite is 3:1, and the pH of the reacted nitrobenzene wastewater is adjusted to 7 .

[0068] Table 2 is the variation data of nitrous acid content in the co-processing of nitrobenzene wastewater by coal-water slurry technology in Example 2.

[0069] Table 2 Test results

[0070]

[0071] As can be...

Embodiment 3

[0073] The present embodiment provides a method for co-processing nitrobenzene wastewater with coal-water slurry technology, which comprises the following steps:

[0074] After the nitrobenzene wastewater is deoxygenated, the pH is adjusted, and then the deoxygenated nitrobenzene wastewater is passed into a reactor containing iron fillers for reaction, and then the pH of the reacted nitrobenzene wastewater is adjusted, and finally mixed with coal. , Additives complete pulping in the mill.

[0075] Wherein, after the deoxidation treatment, the pH of the nitrobenzene wastewater was adjusted to 3, the iron-containing filler was iron filings, the molar ratio of iron filings and nitrite was 4:1, and the pH of the reacted nitrobenzene wastewater was adjusted to 7.

[0076] Table 3 is the variation data of the nitrous acid content in the co-processing of nitrobenzene wastewater by the coal-water slurry technology in Example 3.

[0077] Table 3 Test results

[0078]

[0079]

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Abstract

The invention discloses a method for cooperatively treating nitrobenzene wastewater by a coal water slurry technology, which comprises the following steps: deoxidizing nitrobenzene wastewater, reacting iron with nitrite in the nitrobenzene wastewater, and preparing coal water slurry from the reacted nitrobenzene wastewater, coal and an additive. The invention provides a corrosion control method from the aspect of process, corrosion causes are eliminated, non-planned shutdown caused by corrosion problems is reduced, excessive investment cost of material resources, manpower, financial resources and the like of enterprises is avoided, safe, stable and long-period operation of a coal gasification device is guaranteed, and meanwhile, water resource saving and wastewater resource utilization capabilities are stably improved.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a method for synergistic treatment of nitrobenzene wastewater with coal-water slurry technology. Background technique [0002] Nitrobenzene compounds are extremely important intermediates in the chemical synthesis process, but in the production process, due to the need to carry out alkaline washing and water washing operations to remove the acid and salt in crude nitrobenzene, resulting in a large amount of nitrobenzene-containing wastewater. . As far as the current domestic and foreign organic wastewater treatment and disposal technologies and utilization methods are concerned, the treatment of organic wastewater has always been unable to get rid of the fate of high cost and low profit. Although the corresponding equipment and technical investment are increasing, the environmental protection situation is still grim. [0003] The coal-water slurry technology is a su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C10L1/32
CPCC02F9/00C10L1/326C02F1/66C02F1/20C02F1/705
Inventor 刘希武曹振兴徐健刘旭霞王永德徐效良苗普李辉张若曦
Owner CHINA PETROLEUM & CHEM CORP
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