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High-concentration phenol-ammonia sewage treatment method

A sewage treatment method and high-concentration technology, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problems of restricting technology promotion, treatment benefit discount, low recovery rate, etc. , to achieve the effect of low solubility, low market price and small loss

Active Publication Date: 2013-12-25
HENAN DRAGON INTO COAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above method realizes the simultaneous removal of acid gas, free ammonia and fixed ammonia from coal gasification wastewater in the single tower of sewage stripping, and obtains high-concentration ammonia gas. The content of carbon dioxide, hydrogen sulfide, free ammonia and fixed ammonia in the purified water of the tower is extremely low Provided valuable experience for the treatment of phenolic ammonia-containing coal gasification wastewater, but the cost of extractant use is high, the recovery rate is low and energy consumption is high, which restricts technology promotion, but the selection and use of extractant is the most concerned by the industry Yes, the effect and cost of the extractant, as well as its recovery and side effects after use will have a huge impact on the entire sewage treatment process, and the corresponding treatment benefits will also be greatly reduced

Method used

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  • High-concentration phenol-ammonia sewage treatment method

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Effect test

Embodiment 1

[0036] Applying the above-mentioned device for treating wastewater containing phenol and ammonia, the total phenol content of the wastewater is 17520mg / L, free ammonia 1428 mg / L, fixed ammonia 1598 mg / L, carbon dioxide 1532mg / L, pH value 8.54, water temperature 60℃, flow rate 130 tons / Hour, press figure 1 The flow shown is processed. The hot and cold feed ratio of sewage stripping tower 2 is 0.3:1, the top temperature is 61.5℃, the top pressure is 0.62MPa, the bottom temperature is 161℃, the bottom pressure is 0.648MPa, and the mass percentage concentration is 20% caustic soda aqueous solution flow It is 536.9Kg / hr, the temperature of sideline production is 146℃, and the pressure is 0.62MPa. The operating pressure of the three-stage condenser and the one-stage condenser 3 is 0.55 MPa. The operating temperature is 135°C, the operating pressure of the two-stage partial condenser 10 is 0.45 MPa, the operating temperature is 115°C, the operating pressure of the three-stage conde...

Embodiment 2

[0038] Applying the above device for treating phenol-containing wastewater, the total phenol content of wastewater is 16520mg / L, free ammonia 4015 mg / L, fixed ammonia 2354mg / L, carbon dioxide 5420mg / L, pH value 9.23, water temperature 75°C, flow rate 90 tons / hour ,press figure 1 The flow shown is processed. Sewage stripping tower 2 hot and cold feed is 0.7:1, the top temperature is 59℃, the top pressure is 0.60MPa, the bottom temperature is 162℃, the bottom pressure is 0.63MPa, the mass percentage is 18% caustic soda aqueous solution flow rate 430.5Kg / hr, the temperature of sideline extraction is 145℃, and the pressure is 0.59MPa. The operating pressure of the three-stage decondenser 3 is 0.58MPa and the operating temperature is 140°C. The operating pressure of the two-stage condenser 10 is 0.47MPa and the operating temperature is 120°C. The operating pressure is 0.37MPa and the operating temperature is 50°C. The extraction tower 5 adopts a packed tower, the solvent-sewage ...

Embodiment 3

[0040] Applying the above device for treating phenol-containing wastewater, the total phenol content of wastewater is 6520mg / L, free ammonia is 3015 mg / L, fixed ammonia is 2354mg / L, carbon dioxide is 6420mg / L, pH is 9.26, water temperature is 70℃, flow rate is 90 tons / hour ,press figure 1 The flow shown is processed. Sewage stripping tower 2 hot and cold feed is 1.1:1, the top temperature is 85℃, the top pressure is 0.7MPa, the bottom temperature is 180℃, the bottom pressure is 0.75MPa, and the mass percentage is 20% caustic soda aqueous solution flow rate 380.5Kg / hr, the temperature of sideline extraction is 145℃, and the pressure is 0.59MPa. The operating pressure of the three-stage condensing unit 3 is 0.6 MPa, the operating temperature is 155°C, the operating pressure of the two-stage condenser 10 is 0.5 MPa, and the operating temperature is 125°C, and the operating temperature of the three-stage condenser 4 is The operating pressure is 0.39MPa and the operating temperat...

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Abstract

The invention relates to a high-concentration phenol-ammonia sewage treatment method. The high-concentration phenol-ammonia sewage treatment method includes the steps of conducting deacidification and deamination by conducting alkali injection and pressure stripping through a single tower conducting extraction dephenolization by using butyl acetate as an extraction agent, recycling the extraction agent in an extraction phase through a solvent recovery tower and a solvent stripping tower, and obtaining a crude phenol product at the bottoms of the towers. Due to the characteristics that the butyl acetate is low in price, low in solubility, less in loss in the whole production process, low in energy consumption in the recycling process and the azeotropy point of the butyl acetate and water is high, the dephenolization efficiency can be greatly improved, or the operation expenses spent in the extraction period can be reduced.

Description

Technical field [0001] The invention belongs to the technical field of high-concentration phenol-ammonia sewage treatment technology, and particularly relates to a high-concentration phenol-ammonia sewage treatment method that uses alkali injection pressure stripping, simultaneous deacidification and deamination, and butyl acetate as an extractant. technical background [0002] my country is a large coal country. With the increasing shortage of oil resources, the use of coal resources has gradually expanded. In the coal chemical industry that uses coal as a raw material and undergoes chemical processing, a certain amount of sewage will inevitably be produced in the process of converting coal into gas, liquid and solid fuels and chemicals. Especially in the process of high-temperature carbonization, low-temperature carbonization, gasification, liquefaction, and coal-to-chemicals processing, the waste water that appears in the processing of coal is coking waste water, gasification...

Claims

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Application Information

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IPC IPC(8): C02F9/10C01C1/10
Inventor 白太宽王洪博周景龙杨孔林徐丹
Owner HENAN DRAGON INTO COAL TECH CO LTD
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