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Method for extracting and dephenolizing coal chemical industry wastewater

A coal chemical wastewater and extraction technology, applied in chemical instruments and methods, extraction water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problems of low extraction and removal efficiency, high energy consumption of solvent recovery, extraction and removal rate Low and other problems, to achieve the effect of reducing energy consumption of solvent recovery, small amount of solvent, and improving removal efficiency

Active Publication Date: 2010-12-15
哈尔滨瑞格能源环境技术发展有限责任公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The solubility of diisopropyl ether in water is 0.8%, and the boiling point is 68.5°C. It has a high extraction removal rate for unit phenols, but due to the stronger polarity and water solubility of polyphenols, the extraction removal rate is very low.
[0008] Due to the stronger polarity and water solubility of polyphenols than monophenols, the extraction and removal efficiency is low; and the use of high-efficiency extractants results in high energy consumption and large losses in solvent recovery, which increases operating costs.

Method used

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  • Method for extracting and dephenolizing coal chemical industry wastewater
  • Method for extracting and dephenolizing coal chemical industry wastewater
  • Method for extracting and dephenolizing coal chemical industry wastewater

Examples

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example 1

[0033] The high-concentration phenol-containing wastewater extraction and dephenolization equipment consists of deacidification and deamination tower, extraction tower 1, extraction tower 2, solvent recovery tower 1, solvent recovery tower 2, phenol recovery tower 1, phenol recovery tower 2 and auxiliary heating and heat exchange , Remove mechanical impurities equipment, pumping system. The extraction tower is a packed tower with honeycomb grid structured packing. The deacidification and deamination tower and the solvent recovery tower are plate towers, which are heated by high-pressure steam.

[0034] The process flow of extraction and dephenolization of high-concentration phenol-containing wastewater is as follows: figure 1shown. The high-concentration phenol-containing wastewater produced by Lurgi furnace gasification is pretreated by gravity sedimentation to remove oil, and first enters the stripping, deacidification and deamination tower. The stripping tower is heated ...

example 2

[0038] The water treatment equipment is as described in Example 1. The extraction and dephenolization process of phenolic wastewater is as follows: figure 1 shown.

[0039] The high-concentration phenol-containing wastewater produced by Lurgi furnace gasification is pretreated by gravity sedimentation to remove oil, and first enters the stripping, deacidification and deamination tower. The stripping tower is heated by steam, the temperature of the tower kettle is controlled at 145-155°C, the pressure of the tower kettle is 0.3-0.4MP, and the deacidification and deammoniation water flows out from the bottom of the tower. After removing mechanical impurities, it is cooled by heat exchanger To 45 ~ 50 ℃, the pH value is about 6. Then, the phenolic water is pumped into the top of the first extraction tower and contacted with the extractant diisopropyl ether countercurrently to perform primary extraction and dephenolization. The volume ratio of the extractant and waste water is 1...

example 3

[0044] The water treatment equipment is as described in Example 1. The extraction and dephenolization process of phenolic wastewater is as follows: figure 1 shown.

[0045] The high-concentration phenol-containing wastewater produced by the Lurgi furnace is pretreated by gravity sedimentation to remove oil, and then first enters the stripping, deacidification and deamination tower. The stripping tower is heated by steam, the temperature of the tower tank is controlled at 145-155°C, and the pressure of the tower tank is 0.3-0.4MP. The deamination and deacidification water flows out from the bottom of the tower. After removing mechanical impurities, the heat is exchanged by the heat exchanger. Cool to 45 ~ 50 ℃, pH value is about 7.5. Then, the phenolic water is pumped into the top of the first extraction tower and contacted with the extractant diisopropyl ether countercurrently to perform primary extraction and dephenolization. The volume ratio of the extractant and waste wat...

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Abstract

The invention discloses a method for extracting and dephenolizing coal chemical industry wastewater. Two different solvents are used as extracting agents, and serially-connected double-tower two-stage extracting dephenolization is adopted. The method comprises the following steps of: after carrying out gravity settling oil removal pretreatment on high-concentration phenol-contained wastewater produced in the coal chemical industry process and deacidifying, deaminizing and removing mechanical impurities, carrying out first-stage extracting dephenolization with the first solvent as the extracting agent; and carrying out second-stage extracting dephenolization with the second solvent as the extracting agent and conveying dephenolized water into a biochemical treatment working section. The wastewater subjected to first-stage dephenolization has the total phenol content of 400-1,000mg / l and the COD (Chemical Oxygen Demand) of 2,000-5,000mg / l; the wastewater subjected to second-stage dephenolization has the total phenol content of smaller than 300mg / l and the COD of smaller than 2,000mg / l; and the total phenol removal rate is larger than 90 percent, and the polyphenol removal rate is larger than 70 percent. The invention can meet the requirement of water quality of biochemical treatment, has the advantages of high phenol removal rate, less solvent dosage and low energy consumption and is particularly suitable for treating the wastewater which has high polyphenol content and is produced in the coal gasification, coking and chemical industry synthesis process.

Description

technical field [0001] The invention relates to a coal chemical industry and industrial wastewater treatment technology, in particular to a coal chemical wastewater extraction and dephenolization method. Background technique [0002] Coal chemical wastewater is wastewater produced during coal gasification, dry distillation, purification, and synthesis of chemical products. It has high pollutant concentration and complex composition, including tar, aromatic hydrocarbons, ammonia nitrogen, sulfide, cyanide and other pollutants. One of the most difficult industrial wastewater to treat, it is difficult and costly to treat. [0003] The total phenol content in coal chemical industry wastewater can be as high as 5000 mg / l or more, and the composition is complex, including both unit phenols and polyphenols. It is one of the main pollutants that must be removed because of its great environmental hazards. But on the other hand, phenol is also an important chemical raw material, whic...

Claims

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Application Information

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IPC IPC(8): C02F9/02C02F1/26
Inventor 吴权洪赵建涛王淳郭欣吴勃孟宪磊
Owner 哈尔滨瑞格能源环境技术发展有限责任公司
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