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Resourceful treatment method for coal gasification wastewater

A technology for coal gasification wastewater and treatment methods, applied in chemical instruments and methods, extraction water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem of increasing the processing load of biochemical systems, improving COD indicators, and extractant loss High efficiency and other problems, to achieve the effects of effective recycling, efficient recycling, and control of operating costs

Inactive Publication Date: 2017-12-15
INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the extraction and dephenolization treatment process, traditionally used extractants include organic extractants such as ethyl acetate, diisopropyl ether, methyl isobutyl ketone (MIBK), and tributyl phosphate (TBP). These traditional extractants Usually there is a high solubility, which causes a large loss rate of the extractant during the treatment process, and the extractant enters the treated wastewater, which increases the COD index in the wastewater and increases the processing load of the subsequent biochemical system; another example is diisopropyl Ether is used as the extractant, and both the extract phase and the raffinate phase need to be completely recovered and regenerated by steam evaporation, which leads to high operating costs and high regeneration costs.
[0004] Steam consumption is generally a one-time energy consumption, and the problem of high operating costs

Method used

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  • Resourceful treatment method for coal gasification wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0023] The coal gasification wastewater to be treated is the wastewater after deacidification, deamination and pre-oil removal. The main indicators are: COD: 10000mg / L; oil: 100mg / L; phenol: 2000mg / L; pH value: 7.8.

[0024] The actual wastewater treatment process is as follows: the extraction oil-water ratio is 1:10, the cross-flow contact time is about 30 minutes, the temperature at the top of the extraction section is 30°C, and the dephenolized wastewater is discharged from the bottom after the treatment reaches the standard; the phenol-rich organic phase uses 10% sodium hydroxide The solution is used as an alkali washing solution, and the sodium phenate produced enters the acidification section, and the acidification section passes into the deacidification gas generated by the wastewater deacidification treatment section, the main component is carbon dioxide; the molar ratio of carbon dioxide to sodium phenate is 1.5:1, and the reaction temperature is 20 °C , after the sodi...

Embodiment 2

[0028] The coal gasification wastewater to be treated is the wastewater after deacidification, deamination and pre-oil removal. The main indicators are: COD: 29000mg / L; oil: 350mg / L; phenol: 6500mg / L; pH value: 8.

[0029] The actual wastewater treatment process is as follows: the oil-water ratio of the extractant is 1:2, the cross-flow contact time is about 30min, the temperature at the top of the extraction section is 80°C, and the treated dephenolized wastewater is discharged from the bottom; the phenol-rich organic phase is oxidized with 15% hydrogen The sodium solution is used as the alkaline washing solution, and the sodium phenate produced enters the acidification section, and the acidification section passes into the deacidification gas generated by the wastewater deacidification treatment section, the main component of which is carbon dioxide. The molar ratio of carbon dioxide to sodium phenate is 1.5:1, and the reaction temperature is 40°C. After the complete reaction...

Embodiment 3

[0033] The coal gasification wastewater to be treated is the wastewater after deacidification, deamination and pre-oil removal. The main indicators are: COD: 40000mg / L; oil: 500mg / L; phenol: 10000mg / L; pH value: 7.8.

[0034] The actual process of wastewater treatment is as follows: The ratio of oil to water in the extractant is 1:1. The cross-flow contact time is about 30 minutes, the temperature at the top of the extraction section is 45°C, and the dephenolized wastewater that has reached the standard is discharged from the bottom; 20% sodium hydroxide solution is used as the alkaline washing solution for the phenol-rich organic phase, and the sodium phenate produced enters the acidification section. The deacidification gas produced by the acidification section is fed into the wastewater deacidification treatment section, and its main component is carbon dioxide. The molar ratio of carbon dioxide to sodium phenate is 2:1, and the reaction temperature is 50°C. After the compl...

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Abstract

The invention provides a resourceful treatment method for coal gasification wastewater. According to the method, the coal gasification wastewater subjected to deacidification, deamination and oil pre-removal is extracted and dephenolized, the dephenolized wastewater treated to reach the standard reaches the standard, and enters a coal chemical wastewater biochemical treatment process, and phenols in an extraction phase are converted into sodium phenolate by a phenol-rich organic phase through an alkali cleaning section, so that the aims of an extracting agent and phenol separation are fulfilled; a sodium phenolate solution enters an acidification section, and is acidified to prepare crude phenol and sodium salt; sodium hydroxide is recycled from the sodium salt obtained by separation by causticization reaction, and is recycled for the alkali cleaning section; a dephenolization extracting agent obtained by the alkali cleaning section is subjected to purification treatment to regenerate the extracting agent. According to the method, separation and enrichment of the phenols, heavy oil, light oil and the like in the coal gasification wastewater can be realized to realize recycling of resources, and meanwhile, the extracting agent and alkali liquor can be recycled.

Description

technical field [0001] The invention relates to the field of coal gasification wastewater treatment, in particular to a resource treatment method for coal gasification wastewater. Background technique [0002] In the process of coal gasification production, a large amount of high-pollution and high-concentration coal gasification wastewater will be produced. The composition of the water quality is extremely complex, and the pollution load of these wastewater is very high. The gas water is sent to the gas water separation device, and the gas water is degassed, dust removed, tar, medium oil and dusty tar are recovered through decompression flash evaporation, pressureless gravity sedimentation, oil slick, filtration and other processes, and then sent to phenol ammonia recovery The device recovers valuable substances through the phenol ammonia recovery device. [0003] At present, in the coal gasification wastewater treatment industry, for the wastewater after deacidification a...

Claims

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Application Information

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IPC IPC(8): C02F1/26C02F101/34
CPCC02F1/26C02F2101/345
Inventor 盛宇星韦凤密李海波李玉平刘亚丽李成成
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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