Centrifugal extracting wastewater dephenolization technology

A sewage and extraction technology, applied in the field of environmental engineering, can solve the problems of reducing the added value of phenolic substances, large consumption of acid and alkali, large amount of stripping liquid, etc., and achieves small retention, low solvent loss rate and low operating cost. Effect

Active Publication Date: 2015-06-03
SINOSTEEL ANSHAN RES INST OF THERMO ENERGY CO LTD
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  • Abstract
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Problems solved by technology

This method first requires a relatively high pH value of the raw water, and acid adjustment treatment is required. After extraction, dilute lye needs to be added for stripping. The consumption of acid and alkali is relatively large, and the content of inorganic salts in the water is also increased. After stripping The amount of stripping liquid is also relatively large, which is very difficult to handle and forms new pollution
In addition, phenol is recovered in the form of phenol sodium salt, which greatly reduces the added value of phenolic substances

Method used

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  • Centrifugal extracting wastewater dephenolization technology
  • Centrifugal extracting wastewater dephenolization technology

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Effect test

Embodiment 1

[0039] [Embodiment 1] Adopt the process method of the present invention to process semi-coke production sewage, the main process parameters are as follows:

[0040] Main equipment: large centrifuge speed 1500r / min, separation factor 580;

[0041] Sewage treatment capacity: 10m 3 / h;

[0042] Sewage type: semi-coke production (annual output of 600,000 tons) sewage, total phenol content: 8605.6mg / L, volatile phenol content: 4615.8mg / L;

[0043] Solvent type: methyl isobutyl ketone;

[0044] Sewage to solvent volume ratio; 5.5:1;

[0045] Solvent recovery tower top temperature: 98°C;

[0046] Solvent recovery tower bottom temperature: 185°C;

[0047] Reflux ratio: 0.8;

[0048] The total phenol content of treated sewage: 489.2mg / L, volatile phenol content: 268.9mg / L;

[0049] Solvent loss rate: 1.8‰;

[0050] Recovery of industrial crude phenol: 941 kg / day.

Embodiment 2

[0051]Embodiment 2 adopts the processing method of the present invention to process lignite drying dry distillation sewage, according to figure 1 The process shown in the figure is processed, and the main process parameters are as follows:

[0052] Main equipment: large centrifuge speed 1500r / min, separation factor 580;

[0053] Sewage treatment capacity: 8m 3 / h;

[0054] Sewage type: lignite drying (annual output of 600,000 tons) dry distillation sewage, total phenol content: 9236mg / L, volatile phenol content: 5638mg / L, pH value: 8.5, water temperature: 50°C;

[0055] Solvent type: methyl isobutyl ketone;

[0056] Sewage to solvent volume ratio: 6:1;

[0057] Solvent recovery tower top temperature: 102°C;

[0058] Solvent recovery tower bottom temperature: 198°C;

[0059] Reflux ratio: 0.75;

[0060] The total phenol content of treated sewage: 501.2mg / L, volatile phenol content: 319mg / L;

[0061] Solvent loss rate: 1.7‰;

[0062] Recovery of industrial crude phenol:...

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Abstract

The invention relates to a centrifugal extracting wastewater dephenolization technology. A high-speed centrifuge is used as an extraction device to perform centrifugal extraction separation. The technology comprises the steps as follows: phenol wastewater and an extraction agent enter the centrifuge simultaneously for centrifugal extraction separation, an extract phase phenol solvent and extract phase wastewater are produced after separation, the extract phase phenol solvent enters a solvent recovery tower for rectification separation, and a solvent and crude phenol are recovered; the extraction agent extracted at the top of the tower enters the centrifuge again to be recycled, and the crude phenol is recovered at the bottom of the tower. Compared with the prior art, the technology has the benefits as follows: the technology is low in investment, small in occupied area, simple and reliable in technological process, high in dephenolization efficiency and capable of realizing recovery of the industrial crude phenol.

Description

technical field [0001] The invention relates to the technical field of environmental engineering, in particular to a centrifugal extraction sewage dephenolization process. Background technique [0002] Phenolic sewage mainly comes from chemical enterprises such as petrochemical plants, resin plants, plastic plants, synthetic fiber plants, oil refineries, coking plants, etc. It is one of the important pollutants in water bodies. The composition and concentration of phenols in the sewage varied greatly. [0003] Phenolic compounds can directly enter the blood circulation through contact with the skin and mucous membranes without detoxification by the liver, causing cell damage and loss of vitality, and can also invade the human body through the oral cavity, causing cell damage. High-concentration phenol solution can coagulate protein and continue to penetrate into the body, causing deep tissue damage, necrosis and even systemic poisoning. Even low-concentration phenol solutio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/38C02F1/26
Inventor 张功多李超安路阳孟庆锐王春旭王钟欧
Owner SINOSTEEL ANSHAN RES INST OF THERMO ENERGY CO LTD
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