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Solvent extraction new removing phenol extraction solvent extraction chemical high concentration phenol wastewater

by:Deyuan      2020-09-04
Coal chemical found in high concentration phenol wastewater of coal gas, coal quality, and the system of coal, coal carbonization to coal tar, coal tar hydrogenation and shale carbonization process. The wastewater composition is complicated, phenolics often by solvent extraction recovery. Coal chemical industry wastewater containing high concentration phenol tar, carbon dioxide, hydrogen sulfide, phenol, ammonia, dust, fatty acids and other impurities, including phenol concentration often as high as several thousand to tens of thousands of mg/L, cannot be directly handled by biochemical method. Common processing method is in phenol ammonia pretreatment before the biochemical unit.
solvent extraction method is the most critical part is the selection of extraction agent, the stand or fall of extraction solvent properties directly affect the extraction process of energy and material consumptions. Study of removing phenol extraction agent at home and abroad has a lot of, typical types of the extractant hydrocarbons, alcohols C, ethers, esters, ketones and complexation extraction agent.

at present, more and more mature in industrial application of removing phenol extraction agent is mibk ( MIBK) And diisopropyl ether. Diisopropyl ether low boiling point solvent recovery of low energy consumption, the unit of phenol extraction effect is better, For phenol distribution coefficient is 36. 5, but its polyphenol extraction effect is very poor, For hydroquinone distribution coefficient is 1. 03, does not apply to high content of polyphenol in wastewater. MIBK to unit of phenol and polyphenol has higher distribution coefficient ( For phenol distribution coefficient for 100, for hydroquinone distribution coefficient is 9. 9, widely adopted by the factory, and obtained good effect in industrial applications, but its, much attention has been paid to the problem of high energy consumption is also one of the important reasons is residual solvent in solvent stripping tower stripping recovery, the vapor from the top of the tower in the form of azeotrope produced � � � and MIBK formed azeotrope with water water quality score to 24. 3%, in the process of evaporation and condensation will increase energy consumption. Therefore, it is of great significance to research new removing phenol extraction agent.
new dephenolizing extractant - Methyl Ding Jijia ketone ( MBK) Extraction of coal chemical industry of high concentration phenol wastewater. The experimental results show that although the MBK and MIBK as isomers, but its different ability in the extraction phenolics, service on the phenol extraction unit and MIBK ability, but on the extraction of polyphenol advantage is obvious. Extraction of removing phenol conditions,
service, such as temperature, pH value, compared to the dephenolizing effect. Experiment found that with the increase of temperature, MBK extraction dephenolizing effect gradually decline, but service at high temperature ( 70 ℃) Still have a � � extraction ability; And pH value of MBK extraction dephenolizing effect is larger, when the pH > 9. After 0, extraction capacity fell sharply, in order to ensure the extraction efficiency of removing phenol, optimum pH = 6. 5 an 8. 0; Compared directly affects the size of the waste water after the extraction of total phenol concentration, at the same time, it's about solvent recovery, energy consumption through comparative tests under different than level 3 cross-flow after total phenol concentration and the corresponding energy consumption of solvent recovery, eventually determine appropriate than ( Volume ratio) The range is R = 1:4 1:5.

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