Dephenolizing method for phenol-containing wastewater

A technology for phenol wastewater and dephenolization, which is used in chemical instruments and methods, water pollutants, and multi-stage treatment of water/sewage, etc. It can solve the problem of low extraction rate of crude benzene and medium oil, weak extraction ability of polyphenols, and secondary pollution. and other problems, to achieve the effect of less investment in equipment, ensuring discharge or reuse, and reducing load

Inactive Publication Date: 2017-05-24
YANCHENG OUHUA CHEM IND
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Problems solved by technology

But these extractants all have their obvious defects, such as the diisopropyl ether has weak extraction ability to polyphenols, the energy consumption of methyl isobutyl ketone is too high when solvent recovery is carried out, crude benzene and medium oil not only have low extraction rate, and only It can recover solvents by adopting back-extraction process with complex process and secondary pollution

Method used

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Embodiment Construction

[0015] The invention discloses a method for removing phenols from phenol-containing wastewater, comprising the steps of:

[0016] a. Mix phenol-containing waste water with an extractant mainly composed of methyl tert-amyl ether, and extract in an extraction tower or a multistage mixing clarifier to obtain a solvent phase and an aqueous raffinate phase;

[0017] b. Then the solvent phase is separated by a rectification column with a theoretical stage number of 15-25, a reflux ratio of 0.1-1, an operating pressure of 0.1-0.91MPa, an operating temperature of 50-90°C at the top of the tower, and a temperature of 150-300°C at the bottom of the tower Rectification process rectification, recovery of solvent and crude phenol;

[0018] c. The raffinate water phase is distilled with a distillation recovery solvent process with a tower top temperature of 62-90°C, a tower bottom temperature of 100-130°C, and an amount of material distilled from the tower top of about 1.5-5% of the feed, t...

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Abstract

The invention provides a dephenolizing method for phenol-containing wastewater. The dephenolizing method for the phenol-containing wastewater comprises the following steps: a, mixing phenol-containing wastewater and an extracting agent which takes methyl terschyl ether as a main body and extracting in an extracting tower or a multi-stage mixer-settler to obtain a solvent phase and a raffinate aqueous phase; b, rectifying the solvent by a rectification process and recycling the solvent and coarse phenol, wherein the rectifying tower theoretical stage is 15 to 25, the reflux ratio is 0.1 to 1, the operating pressure is 0.1 to 0.91 MPa, the tower top operating temperature is 50 to 90 DEG C, and the tower bottom temperature is 150 to 300 DEG C; c, distilling the raffinate aqueous phase by a distillation solvent recovery process and recycling residual extracting solvent, wherein the tower top temperature is 62 to 90 DEG C, the tower bottom temperature is 100 to 130 DEG C, and the amount of a material which is distilled from the top of the tower is 1.5 to 5 percent of that of a fed material; d, recycling the extracting solvent. The dephenolizing method for the phenol-containing wastewater has the beneficial effects that the process flow is simple; the equipment investment is low; the solvent recycling energy consumption is low; the recycling rate of the phenol is high.

Description

technical field [0001] The invention relates to a method for dephenolizing waste water containing phenol. Background technique [0002] In the dry distillation, drying and gasification process of low-quality coal, a large amount of gasification wastewater will be produced, containing high concentrations of phenols and other pollutants. Phenols have strong biological toxicity and great harm. At the same time, phenols are also important chemical raw materials. Therefore, the efficient removal and recovery of phenolic substances in coal chemical wastewater is not only of environmental significance, but also of certain economic significance. [0003] At present, in industrial installations, liquid-liquid extraction is the most widely used, stable and mature dephenolization method. For coal chemical wastewater, currently commonly used extractants include diisopropyl ether, methyl isobutyl ketone, crude benzene, and medium oil. But these extractants all have their obvious defec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F101/34
Inventor 卢圣茂王志伟郭宇时娇娇
Owner YANCHENG OUHUA CHEM IND
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