Extraction and dephenolization process of coal gasification wastewater

A coal gasification wastewater and extraction technology, applied in chemical instruments and methods, extraction water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problems of low extraction efficiency, low distribution coefficient, low extraction tower efficiency, etc., to achieve The technical process is simple, the distribution coefficient is high, and the effect of high dephenolization efficiency
CN1834040AInactive Publication Date: 2006-09-20SOUTH CHINA UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SOUTH CHINA UNIV OF TECH
Publication Date
2006-09-20
Estimated Expiration
Not applicable · inactive patent
Patent Text Reader

Abstract

This invention discloses a method to remove high-concentration hydroxybenzenes from coal-gasification sewage, that is, coal-gasification sewage containing hydroxybenzenes and isobutyl methyl ketone as extracting solvent are mixed and separated so as to obtain solvent phase and remnant aqueous phase liquid. Solvent and crude hydroxybenzene are extracted from the solvent phase by distillation. Multiple-class reflux extraction is carried out towards remnant aqueous phase liquid and rudimental solvent is further extracted from the extract. Facilities involved in this method include a static mixer, an oil-water separator, a hydroxybenzene distillation tower and an extraction tower. Extracting coal-gasification sewage containing high-concentration hydroxybenzenes with the method provided by this invention, total hydroxybenzene extraction ratio can be as high as 92%. Besides, it also has the advantages of simple technique, soft conditions and recyclable extraction solution.
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Description

technical field

[0001] The invention relates to a method for treating and recovering wastewater, in particular to a method for extracting and removing phenols from gasification wastewater containing high-concentration phenol-containing coal. Background technique

[0002] Phenols are protoplasmic poisons and have toxic effects on all living individuals. Very low content can still cause chronic poisoning, and when the concentration is higher than 1mg / L, it can directly lead to the death of organisms, seriously endangering ecology and the environment. Coal gasification, oil refining and coking industries produce a large amount of phenol-containing wastewater in the production process. The quality of the wastewater is very complicated, the concentration of phenol is high, and there are many types of phenols, including both unit phenols and polyphenols; the water quality is moderately alkaline; Contains organic substances such as fatty acids, ketones and amines, acid gases, tar,...

Claims

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