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Method for extracting high-concentration phenol-containing coal chemical industry wastewater at high temperature by using methyl isobuthyl ketone

A technology of methyl isobutyl ketone and coal chemical wastewater, applied in the direction of extraction water/sewage treatment, etc., to achieve good extraction efficiency, enhanced extraction, and high extraction temperature

Active Publication Date: 2015-04-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

ZL200610033932.1 discloses that although the extraction solvent is methyl isobutyl ketone, the patent adopts deacidification first, then extraction, and then solvent and ammonia recovery process, the extraction pH value is usually higher than 9, and the extraction phase is separated. Distillation tower is a complex tower, it is necessary to separate the extractant and ammonia

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Coal gasification high concentration phenol ammonia wastewater 180 tons / hour, free ammonia 2300mg / L, fixed ammonia 3000mg / L, volatile phenol 6000mg / L, total phenol 9600mg / L, COD23000mg / L, oil content 300mg / L. Methyl isobutyl ketone and coal gasification high-concentration phenol ammonia wastewater after deacidification, deamination and oil removal are mixed in a static mixer, and then enter the oil-water separator for clarification to complete an extraction. The pH value of the wastewater is 6.5, and the volume ratio of the extractant to the wastewater The ratio is 1:4, and the extraction temperature is 80°C to obtain an extract phase containing more volatile phenols and a small amount of non-volatile phenols, and a raffinate phase. The extract phase and the raffinate phase are extracted countercurrently in the packed extraction tower, and the extraction stages are 4 stages to obtain the secondary extract phase and the secondary raffinate phase. The secondary extraction...

Embodiment 2

[0028] Coal gasification high concentration phenol ammonia wastewater 180 tons / hour, free ammonia 2300mg / L, fixed ammonia 3000mg / L, volatile phenol 6000mg / L, total phenol 9600mg / L, COD23000mg / L, oil content 300mg / L. Similar to the ZL100412010C process, the extraction phase from the packed extraction tower is mixed with the coal gasification high-concentration phenolic ammonia wastewater after deacidification, deamination and oil removal in a static mixer, and then enters the oil-water separator for clarification. The pH value of the wastewater is 6.5. The extraction agent and The volume ratio of wastewater is 1:4, and the extraction temperature is 80°C. The extract phase separated by the oil-water separator enters the rectification tower to separate the extractant and crude phenol, the number of rectification stages is 10, the operating pressure at the top of the tower is 0.12MPa, the temperature at the top of the tower is 107°C, and the temperature at the bottom of the tower i...

Embodiment 3

[0030]Coal gasification high concentration phenol ammonia wastewater 80 tons / hour, total ammonia 8500mg / L, volatile phenol 3340mg / L, total phenol 1800mg / L, COD21000mg / L. Methyl isobutyl ketone and coal gasification high-concentration phenol ammonia wastewater after deacidification, deamination and oil removal are mixed in a static mixer, and then enter the oil-water separator for clarification to complete an extraction. The pH value of the wastewater is 6.5, and the volume ratio of the extractant to the wastewater The ratio is 1:8, the extraction temperature is 40°C, and the extract phase containing more volatile phenols and a small amount of non-volatile phenols, and the raffinate phase are obtained. The extract phase and the raffinate phase are extracted countercurrently in the packed extraction tower, and the number of extraction stages is 10 to obtain a secondary extract phase and a secondary raffinate phase. The secondary extraction phase enters the rectification tower to...

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Abstract

The invention belongs to the field of extraction and phenol removal of high-concentration phenol-containing coal chemical industry wastewater and discloses a method for extracting a high-concentration phenol-containing coal chemical industry wastewater solvent at high temperature by using methyl isobuthyl ketone. The method comprises the following steps: mixing the methyl isobuthyl ketone and the high-concentration phenol-containing coal chemical industry wastewater by using a static mixer and clarifying by using an oil water separator to obtain an extraction phase and a raffinate phase; or directly extracting the methyl isobuthyl ketone and the high-concentration phenol-containing coal chemical industry wastewater in a mixing and clarifying device in advance to obtain an extraction phase and a raffinate phase; performing countercurrent extraction on the extraction phase and the raffinate phase in an extraction tower to obtain a secondary extraction phase and a secondary raffinate phase respectively; allowing the secondary extraction phase to enter a rectifying tower to separate to obtain the methyl isobuthyl ketone and crude phenol; allowing the secondary raffinate phase to enter another rectifying tower to separate to obtain the methyl isobuthyl ketone and extracted water; allowing the methyl isobuthyl ketone obtained through separation to enter a solvent storage tank in a concentrated mode and recycling; and allowing the extracted water to enter a subsequent biochemical treatment section to perform further treatment.

Description

technical field [0001] The invention belongs to the field of extracting and removing phenols from high-concentration phenol-containing coal chemical wastewater, and relates to a method for extracting high-concentration phenol-containing coal chemical wastewater solvents with methyl isobutyl ketone at high temperature, which can efficiently remove volatile phenols and non-volatile phenols at the same time. Background technique [0002] Coal chemical industry includes coal to natural gas, coal to oil, coal to olefins, coal tar refining, coal gasification, etc. High-concentration phenol-containing wastewater from coal chemical industry refers to wastewater containing high-concentration volatile phenols and non-volatile phenols produced by coal-related chemical industries. The water quality of this type of wastewater is complex, and the pollutants mainly include ammonia, carbon dioxide, unit phenols, polyphenols, fatty acids, etc., and the content of hydrogen sulfide is relative...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/26
Inventor 陈赟张鹏羽
Owner SOUTH CHINA UNIV OF TECH
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