Treatment and reclaimation method of coal gasification wastewater contg. phenol

A technology of coal gasification wastewater and recovery method, applied in chemical instruments and methods, water/sewage multi-stage treatment, extraction water/sewage treatment, etc. The effect of low processing cost, small footprint and stable operation

Inactive Publication Date: 2006-09-20
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a treatment and recovery method for high-concentration phenol-containing coal gasification wastewater in view of the technica

Method used

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  • Treatment and reclaimation method of coal gasification wastewater contg. phenol

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Experimental program
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Embodiment 1

[0030] (1) Wastewater to be treated

[0031] Select high-concentration phenol-containing coal gasification wastewater to be treated, with a treatment capacity of 100t / h, of which: the total phenol content is 5410mg·l -1 , of which 2750mg·l volatile phenol -1 ;Fatty acid about 3120mg·l -1 , total ammonia 7500mg·l -1 , oil content 350mg·l -1 ;COD Cr Value 22000mg·l -1 ; The pH value is 10, and the water temperature is 50°C.

[0032] (2) Disposal and recycling

[0033] according to figure 1 process as shown. The waste water to be treated enters the static mixer, and is mixed with the solvent methyl isobutyl ketone from the extraction tower in parallel, and the volume ratio (comparison) of the extraction solvent and waste water is 1:6. After being extracted by methyl isobutyl ketone, it enters the oil-water separator and stands still for 20 minutes. The upper solvent layer enters the crude phenol recovery rectification tower to separate the extractant methyl isobutyl ket...

Embodiment 2

[0036] (1) waste water to be treated, with embodiment 1;

[0037] (2) processing and recovery flow process are the same as embodiment 1, and its specific process conditions are as follows:

[0038] In the step (1), the industrial phenol-containing waste water and the extraction solvent are mixed in parallel in the static mixer, the pH of the waste water is 3, and the temperature is 85°C; the volume ratio of the solvent to the waste water is 1:10; the residence time of the waste water in the oil-water separator is 10min . The pH of the raffinate in the extraction tower is 11, the extraction temperature is 30°C, the extraction ratio is 10:1, and the number of extraction stages is 3. The extraction tower adopts honeycomb grid structured packing.

[0039] In step (2), the rectifying tower adopts a plate tower, the tower top pressure is 105kPa, the tower top temperature is 98±1°C, the tower still pressure is 130kPa, and the tower still temperature is 192±1°C; the reflux ratio is ...

Embodiment 3

[0044] (1) waste water to be treated, with embodiment 1;

[0045] (2) processing and recovery flow process are the same as embodiment 1, and its specific process conditions are as follows:

[0046] In the step (1), the industrial phenolic waste water and the extraction solvent are mixed in parallel in the static mixer, the pH of the waste water is 11, and the temperature is 30°C; the volume ratio of the solvent to the waste water is 10:1; the residence time of the waste water in the oil-water separator is 10min . In step (1), the pH of the raffinate in the extraction tower is 11, the extraction temperature is 30° C., the extraction ratio is 10:1, and the number of extraction stages is 8. The extraction tower adopts honeycomb grid structured packing.

[0047] In step (2), the rectifying tower adopts a plate tower, the tower top pressure is 120kPa, the tower top temperature is 98±1°C, the tower still pressure is 115kPa, and the tower still temperature is 192±1°C; the reflux ra...

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Abstract

This invention relates to a method to dispose and recycle coal-gasification sewage containing high-concentration hydroxybenzenes, which includes following steps: a) acid removal; b) hydroxybenzene removal by extraction; c) regeneration of extraction solvent; d) ammonia recycling and rudimental extraction solvent recycling. The extraction solvent is isobutyl methyl ketone. After disposal with this method, more than 92% hydroxybenzenes and 99.5% ammonia can be recycled from the sewage. The extractant can be regenerated by distillation separation. The regenerated extractant is high purified and can meet the requirement of circulative extraction. Besides, while hydroxybenzenes, especially polyphenols are effectively recycled, CODCr of the sewage is also greatly lowered, which is benefic to sewage biochemical standardization.

Description

technical field [0001] The invention relates to a comprehensive treatment technology for high-concentration phenol-containing wastewater produced in the gas production process, in particular to a treatment and recovery method for high-concentration phenol-containing coal gasification wastewater. Background technique [0002] A large amount of phenolic wastewater is produced in the coal gasification process. Wastewater quality is very complex. The concentration of phenols is high, and there are many types of phenols, including both unit phenols and polyphenols; the wastewater contains a lot of ammonia, and the water quality is moderately alkaline; in addition, it also contains organic substances such as fatty acids, ketones and amines, acid gases, tar, powder Soot etc. Wastewater COD Cr High value and difficult to biodegrade. This kind of high-concentration phenol-containing coal gasification wastewater has always been a major technical problem i...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F1/26
Inventor 钱宇章莉娟江燕斌盖恒军李焕锡
Owner SOUTH CHINA UNIV OF TECH
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