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Application of methyl n-butyl ketone and treatment method of phenolic wastewater

A technology of methyl n-butyl ketone and treatment method, which is applied in the field of treatment of phenol-containing wastewater, and can solve problems such as inability to remove polyphenols well

Active Publication Date: 2018-11-23
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the defect that polyphenols cannot be removed well by adopting the existing dephenol extractant, and provide the application of methyl n-butyl ketone as the dephenol extractant of phenol-containing wastewater and a kind of phenol-containing wastewater processing method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] This embodiment is used to illustrate the treatment method of phenol-containing wastewater provided by the present invention.

[0028] Phenol-containing wastewater (total phenol content is 12700mg·L -1 , the unit phenol content is 8450mg·L -1 , the content of polyphenols is 4250mg·L -1 , COD value is 32268mg·L -1 ) to adjust the pH value to 6.5, and conduct countercurrent extraction with the dephenolizing extractant methyl n-butyl ketone in the extraction tower. The extraction temperature is 40°C, and the extract phase containing crude phenol and a large amount of dephenolizing extractant and the raffinate phase containing a small amount of dephenolizing extractant and a large amount of waste water are respectively obtained. The extraction phase enters the rectification tower, that is, the phenol tower. The theoretical stages of rectification are 15, the temperature of the tower bottom is 211-213°C, and the pressure is 0.105-0.11MPa. product. The raffinate phase en...

Embodiment 2

[0030] This embodiment is used to illustrate the treatment method of phenol-containing wastewater provided by the present invention.

[0031] Phenol-containing wastewater (total phenol content is 12700mg·L -1 , the unit phenol content is 8450mg·L -1 , the content of polyphenols is 4250mg·L -1 , COD value is 32268mg·L -1 ) to adjust the pH value to 8, and conduct countercurrent extraction with the dephenolizing extractant methyl n-butyl ketone in the extraction tower. The temperature is 85°C, and the extract phase containing crude phenol and a large amount of dephenolizing extractant and the raffinate phase containing a small amount of dephenolizing extractant and a large amount of waste water are respectively obtained. The extraction phase enters the rectification tower, that is, the phenol tower. The theoretical stages of rectification are 5, the temperature of the tower bottom is 218-220°C, and the pressure is 0.14-0.15MPa. product. The raffinate phase enters the rectif...

Embodiment 3

[0033] This embodiment is used to illustrate the treatment method of phenol-containing wastewater provided by the present invention.

[0034] Phenol-containing wastewater (total phenol content is 12700mg·L -1 , the unit phenol content is 8450mg·L -1 , the content of polyphenols is 4250mg·L -1 , COD value is 25145mg·L -1 ) to adjust the pH value to 5, and with the mixture of the dephenolic extractant methyl n-butyl ketone and methyl isobutyl ketone (based on the total weight of the mixture, the content of the methyl n-butyl ketone is 80 volume %, the content of the methyl isobutyl ketone is 20% by weight) in the extraction tower for countercurrent extraction, the extraction theoretical stage is 8, the volume of the dephenol extraction agent and the phenol-containing wastewater is 1:10, and the extraction temperature is 50 °C, the extract phase containing crude phenol and a large amount of dephenolizing extractant and the raffinate phase containing a small amount of dephenoli...

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Abstract

The invention provides an application of methyl n-butyl ketone as a phenol-containing wastewater dephenolizing extractant, and a phenol-containing wastewater treatment method. The phenol-containing wastewater treatment method is characterized in that phenol-containing wastewater is extracted by using a dephenolizing extractant to obtain an extract phase and a raffinate phase, and the dephenolizing extractant contains methyl n-butyl ketone. Phenol substances in the phenol-containing wastewater can be effectively removed through adopting the method. Additionally, a high monophenol and polyphenol distribution coefficient can be obtained by adopting the dephenolizing extractant containing methyl n-butyl ketone at a high extraction temperature in order to alleviate obstruction of a heat exchanger between a deacidification and deamination tower and an extraction tower and reduce the use amount of recirculated cooling water, so the dephenolizing extractant has extremely good industrial application prospect.

Description

technical field [0001] The invention relates to the application of methyl n-butyl ketone as a dephenol extraction agent for phenol-containing wastewater and a treatment method for phenol-containing wastewater. Background technique [0002] Lurgi gasification, BGL gasification process, coal low-temperature dry distillation, oil shale low-temperature dry distillation, and coal tar hydrogenation processes will produce phenolic ammonia wastewater, in which phenolic substances include unit phenols and polyphenols. At present, when treating this type of phenolic wastewater, it is usually necessary to deacidify and deammoniate this type of wastewater first, so that the acid-base environment of the subsequent extraction is below pH 9, and then select a suitable extractant for extraction. Most of the phenolic substances enter the extraction phase, and the content of the phenolic substances remaining in the raffinate phase is very low and can be directly processed, and then the extrac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/26C02F101/34
Inventor 钱宇于广欣陈赟郑长波崔德春纪钦洪王卓盛金鹏金阳刘肃力李秀喜贺清
Owner CHINA NAT OFFSHORE OIL CORP
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