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Method for treating gasified waste water containing high-concentration phenol and ammonia

A high-concentration technology for coal gasification sewage, applied in chemical instruments and methods, preparation/separation of ammonia, preparation of organic compounds, etc. To improve the effect of phenol removal, alleviate the problem of ammonia salt crystallization and scaling, and ensure long-term stable operation

Inactive Publication Date: 2011-05-11
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The most prominent shortcomings of the existing process are: the process extraction and dephenolization effect caused by the alkaline water quality during extraction is not good; because the existing extraction agent is not efficient for the removal of polyphenols in sewage, resulting in polyphenols in sewage High content; due to the high content of carbon dioxide, and the deamination is carried out at the end, there is always a lot of carbon dioxide and ammonia coexisting in the operation process, and the reaction between the two produces ammonia salt crystallization, which leads to fouling of the equipment, serious blockage, and affects Equipment efficiency; the existing process is a foaming system, which is prone to flooding and affects the normal operation of the equipment
However, the extraction agent used in this method is diisopropyl ether, which has an unsatisfactory effect on the extraction of polyphenols in sewage, which increases the dephenol load in the subsequent biochemical treatment section.

Method used

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  • Method for treating gasified waste water containing high-concentration phenol and ammonia
  • Method for treating gasified waste water containing high-concentration phenol and ammonia
  • Method for treating gasified waste water containing high-concentration phenol and ammonia

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Applying the above-mentioned device for treating coal gasification wastewater containing phenol and ammonia, the total phenol content of coal gasification wastewater is 5018 mg L -1 , free ammonia 4012mg·L -1 , fixed ammonia 2036mg·L -1 , CO 2 8072mg·L -1 , the pH value is 9.5, the water temperature is 88°C, the flow rate is 100 tons / hour, according to figure 1 process shown. The cold and hot feed ratio of the sewage stripping tower is 1:4, the temperature at the top of the tower is 61.5°C, the pressure at the top of the tower is 0.62MPa, the temperature at the bottom of the tower is 161°C, the pressure at the bottom of the tower is 0.648MPa, the mass percentage concentration is 20% caustic soda aqueous solution flow rate is 413kg· hr -1 , the temperature of the side line production is 146.0°C, and the pressure is 0.62MPa. The operating pressure of the first stage partial condenser is 0.51MPa, the operating temperature is 135.4°C, the operating pressure of the s...

Embodiment 2

[0032] Applying the above-mentioned device for treating coal gasification wastewater containing phenol and ammonia, the total phenol content of coal gasification wastewater is 6523mg L -1 , free ammonia 4311mg·L -1 , fixed ammonia 1807mg·L -1 , CO 2 6037mg·L -1 , the pH value is 9.8, the water temperature is 88°C, the flow rate is 80 tons / hour, according to figure 1 process shown. The cold and hot feed ratio of the sewage stripping tower is 1:3.5, the temperature at the top of the tower is 58°C, the pressure at the top of the tower is 0.582MPa, the temperature at the bottom of the tower is 159°C, the pressure at the bottom of the tower is 0.622MPa, the mass percentage concentration is 18% caustic soda aqueous solution flow rate is 382.5kg ·hr -1 , the temperature of the side line production is 143.4°C, and the pressure is 0.59MPa. The operating pressure of the first stage partial condenser is 0.46MPa, the operating temperature is 137°C, the operating pressure of the se...

Embodiment 3

[0034] Applying the above-mentioned device for treating coal gasification wastewater containing phenol and ammonia, the total phenol content of coal gasification wastewater is 5218mg L -1 , free ammonia 4541mg·L -1 , fixed ammonia 1540mg·L -1 , CO 2 6423mg·L -1 , the pH value is 9.2, the water temperature is 70°C, the flow rate is 90 tons / hour, according to figure 1 process shown. The cold and hot feed ratio of the sewage stripping tower is 1:4, the temperature at the top of the tower is 55°C, the pressure at the top of the tower is 0.55MPa, the temperature at the bottom of the tower is 155°C, the pressure at the bottom of the tower is 0.61MPa, the mass percentage concentration is 25% caustic soda aqueous solution flow rate is 354kg. hr -1 , the temperature of the side line production is 149.2°C, and the pressure is 0.571MPa. The operating pressure of the first stage partial condenser is 0.432MPa, the operating temperature is 125.7°C, the operating pressure of the secon...

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Abstract

The invention relates to a method for treating gasified waste water containing high-concentration phenol and ammonia. The method comprises the following steps: injecting alkali, pressurizing, stripping and removing acidic gas and ammonia in a waste water stripper, side-drawing ammonia-rich gas and segregating and concentrating by three levels, and extracting phenol from waste water after acid andammonia removal with MIBK as a solvent. With regard to extraction for phenol removal, residue generated is transported to the upper part of an extracting tower for countercurrent extraction after being cooled to 40 DEG C to 60 DEG C, with the volume ratio between the MIBK and the waste water being 1:4-10. The method realizes simultaneous removal of acidic gas, free ammonia and fixed ammonia from gasified waste water in the waste water stripper and obtains high-concentration alkaline air. The content of free ammonia and fixed ammonia in purified water from the waste water stripper is extremelylow, thus causing the pH value of waste water treated to reduce to 6 and being beneficial to the phenol removal effect of subsequent extraction part at an acidic status. Simultaneously, the MIBK has relatively good effect on the extraction of polyhydric phenol and can effectively remove polyhydric phenol in the waste water. In the method, the solvent can be easily recovered, with little loss of solvent and high phenol removal efficiency.

Description

technical field [0001] The invention relates to a method for treating coal gasification sewage containing high concentration of phenol ammonia, in particular to a method for treating coal gasification sewage by injecting alkali, pressurized stripping, simultaneous deacidification and ammonia removal and using MIBK as an extraction agent. technical background [0002] Coal gasification is an effective way to use coal cleanly and efficiently, and it is widely used in industries such as coal-to-gas, synthetic ammonia, and coal-fired power generation. The Lurgi pressurized gasification process is currently the most mature technology among various coal gasification processes. Due to the advantages of low energy consumption, low oxygen consumption and high efficiency, this process has become the most widely used coal gasification process in the world and in my country. However, this process produces a large amount of scrubbing wastewater containing high concentrations of phenol am...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C01C1/10C07C37/72C02F1/20C02F1/26C02F101/16C02F101/34
Inventor 陈赟周志远钱宇盖恒军高亚楼李秀喜吴昌祥余振江宁秋实章莉娟李旭光孟祥青
Owner SOUTH CHINA UNIV OF TECH
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