Method of recovery phenol from waste water and system thereof

A technology for recovering phenol and waste water, which is applied in chemical instruments and methods, extraction water/sewage treatment, and preparation of organic compounds. The effect of small solvent loss and low energy consumption

Inactive Publication Date: 2007-02-28
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this process, the wastewater passes through two extraction areas, so two sets of solvent recovery parts are brought accordingly, and the residual extraction agent in the wastewater needs to be recycled, so the process is relatively complicated and consumes a lot of energy.
Chinese published patent CN1071299C also uses two kinds of extractants to treat phenolic wastewater through two extraction zones. The problems brought by this process are the same as those of the previous patent.

Method used

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  • Method of recovery phenol from waste water and system thereof

Examples

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Effect test

Embodiment 1

[0031] Flow rate is 15t / hr, and the aqueous solution that content is 40% (mass content) phenol and hydroquinone mixture enters extraction tower 1 through pipeline a, and extraction tower height is 16.0 meters, and tower diameter is 1.0 meters, organic solvent methyl isobutyl The base ketone (MIBK) enters the extraction tower 1 through the pipeline b, and the ratio of the organic solvent phase to the water phase is 1:1. After the two phases are contacted in countercurrent, the content of mixed phenols in the raffinate is 0.03%. The organic solvent loaded with phenol enters the feeding pipe in the middle part of the organic solvent recovery tower 3 through the pipeline c on the top of the extraction tower 1. The organic solvent recovery tower is 18.0 meters high, and the tower diameter is 1.8 meters. °C, the mixed phenols are discharged from the bottom of the tower through pipe i, and MIBK is condensed from the top of the tower and sent to the bottom of extraction tower 1 through...

Embodiment 2

[0033] Flow rate is 50L / hr, and the aqueous solution that content is 7% (mass content) phenol and hydroquinone mixture enters extraction tower 1 through pipeline a, and extraction tower height is 3.0 meters, and tower diameter is 0.05 meters, organic solvent methyl isopropyl The methyl ketone enters the extraction tower 1 through the pipeline b, and the ratio of the organic solvent phase to the water phase is 1:3. After the two phases are countercurrently contacted, the content of mixed phenols in the raffinate is 0.03%. The organic solvent loaded with phenol enters the feed pipe in the middle of the organic solvent recovery tower 3 through the pipeline c on the top of the extraction tower 1. The organic solvent recovery tower is 4.0 meters high, and the tower diameter is 0.1 meters. °C, the mixed phenols are discharged from the tower kettle through pipeline i, and the solvent is condensed from the top of the tower and sent to the bottom of extraction tower 1 through pipeline h...

Embodiment 3

[0035] The flow rate is 2t / hr, and the aqueous solution of unit phenol and polyphenol with a content of 0.5% (mass content) enters the extraction tower 1 through pipeline a. The height of the extraction tower is 10.0 meters, and the tower diameter is 0.3 meters. The organic solvent methyl isobutyl The ketone (MIBK) enters the extraction tower 1 from pipeline b, the ratio of the organic solvent phase to the water phase is 1:6, and after the two phases are contacted in countercurrent, the mixed phenol content in the raffinate is 0.05%. The organic solvent loaded with phenol enters the feeding pipe in the middle part of the organic solvent recovery tower 3 through the pipeline c on the top of the extraction tower 1. The organic solvent recovery tower is 12.0 meters high, and the tower diameter is 0.4 meters. °C, the mixed phenols are discharged from the bottom of the tower through pipe i, and MIBK is condensed from the top of the tower and sent to the bottom of extraction tower 1 ...

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Abstract

The invention discloses a recycling method and system in the phenolwaste water, which comprises the following steps: adopting ketone organic solvent as extractant; adopting extracting tower, organic solvent recycling tower and stripping tower to extract; distilling; stripping to obtain the product. The system is composed of extracting tower, organic solvent recycling tower, stripping tower and corresponding connecting pipe.

Description

technical field [0001] The invention relates to a chemical separation and water treatment technology, in particular to a method and system for recovering phenol from aqueous solution or waste water. Background technique [0002] Phenol-containing wastewater or aqueous solution mainly comes from chemical enterprises such as petrochemical plants, resin plants, coal gasification plants, oil refineries, and coking plants. Phenol is one of the important pollutants in water bodies. Due to different industrial categories, product types and process conditions, the wastewater composition and phenolic concentration vary greatly. It is generally divided into acidic, alkaline, neutral phenolic wastewater and volatile and non-volatile phenolic wastewater. [0003] Due to the different composition, acidity and alkalinity, and concentration of phenolic wastewater, the treatment methods are also different. At present, the methods for treating phenolic wastewater in industry are generally d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C39/02C07C39/04C07C39/08C07C37/70C02F1/26
Inventor 朴香兰汤志刚朱慎林
Owner TSINGHUA UNIV
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