Technique for removing and reclaiming phenol from coke-plant waste water

A technology for coking wastewater and wastewater, applied in water/sewage treatment, chemical instruments and methods, adsorbed water/sewage treatment, etc., can solve the problems of inability to deal with non-volatile phenol, difficulty in desorption, secondary pollution, etc., and achieve the cost of adsorbent. The effect of low cost, simple process operation and convenient operation

Inactive Publication Date: 2006-06-21
CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI
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Problems solved by technology

Steam dephenolization is a cyclic treatment method combining liquid-gas contact exchange and chemical dephenolization. It is simple to operate, but it cannot treat non-volatile phenols in wastewater (Inoue K, et al. Sep Sci Tech, 1980, 115: 1243) ; Activated carbon adsorption is a liquid-solid contact adsorption and physicochemical desorption combined cycle treatment method, although there is a larger adsorption capacity, desorption is more difficult, phenol recovery is not complete (Wojtech J, et al.Chem Eng Technol , 1985, 57: 134); the key link of solvent extraction to reclaim phenol is the selection of extractant, but existing extractants such as heavy benzene oil, gasoline, crude benzene, nitrobenzene, etc. have low extraction efficiency and can only partially recover waste water The phenolic substances in them are highly toxic and easily cause secondary pollution (such as heavy benzene oil, etc.) (Yang Yiyan. Graduate Journal of Tsinghua University, 1987, 5: 42); and the biochemical dephenolization method only oxidizes phenolic compounds into CO 2 and H 2 O and other non-toxic substances, so that a large amount of valuable phenols cannot be recovered

Method used

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  • Technique for removing and reclaiming phenol from coke-plant waste water

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Experimental program
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Effect test

Embodiment 1

[0018] Take the treatment of coking wastewater with a phenolic content of 1072.79 mg / L in a coking plant as an example:

[0019] 1. At room temperature of 30 °C, the coking wastewater first enters the adjustment tank, and NaOH is added to adjust the pH of the wastewater to 11.03.

[0020] 2. The effluent from the conditioning tank enters the chemical sedimentation tank, where barium ions are added to react with phenolic substances for 15 minutes to form insoluble compounds to precipitate, and the phenolic concentration in the water is detected after filtration. BaCl 2 ·2H 2 The amount of O added was 2 g / L, and the removal rate of phenol was 47.62%. See Table 1 for details.

[0021] 3. The phenol precipitate separated from the chemical sedimentation tank is dissolved with hydrochloric acid, and the precipitant barium ion is reduced for recycling; the phenolate is re-converted into phenol and released, and then benzene is added for extraction and recovery. kg.

Embodiment 2

[0023] Embodiment and reaction conditions are exactly the same as Example 1, BaCl 2 ·2H 2 The amount of O added was increased to 4 g / L, and the removal rate of phenol was 53.25%. See Table 1 for details. The crude phenol was 0.456 kg per ton of coking wastewater treated.

Embodiment 3

[0025] Embodiment and reaction conditions are exactly the same as Example 1, BaCl 2 ·2H 2 The amount of O added was increased to 6g / L, and the removal rate of phenol was 60.53%, as shown in Table 1, and 0.509kg of crude phenol was obtained per ton of coking wastewater treated.

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Abstract

The invention relates to a method of removing phenol from charring wastewater and the recovery technology, that is to remove and recover phenol matter in the charring wastewater with ion-precipitation method firstly, then reduce the phenol content to a low concentration with coke adsorption method. The technology overcomes the shortcoming of no recovery of the large quantity of phenol with biological dephenolizing method, and is characterized by the short process, convenient operation and settling agents reusage, and develops a new way for phenol removing and recovery for the phenolic waste water. Furthermore, the further treatment of the charring water by employing coke as adsorbent can reduce the yielding water phenol content, and is characterized by simple process and low cost, and provides an economic feasible way for treating phenolic waste water.

Description

technical field [0001] The invention relates to a novel technology for removing and recovering phenol from coking wastewater, and belongs to the technical field of environmental protection. Background technique [0002] Coking wastewater contains more phenolic substances. Due to the strong toxicity of phenol, the harm to the ecology and the environment is greater, so the treatment of phenol-containing wastewater has become an environmental protection issue that people pay more and more attention to. At the same time, phenolic compounds have a wide range of uses in the chemical industry and are important organic chemical raw materials. Therefore, in the treatment of industrial phenol-containing wastewater, on the one hand, the phenol content should be greatly reduced to reduce environmental pollution, and on the other hand, valuable substances in the wastewater should be recovered as much as possible to turn waste into treasure. [0003] Over t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/58C02F1/28C02F1/52
Inventor 操卫平冯玉军李自树夏雨鲁智勇苏鑫
Owner CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI
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