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Liquid-liquid extraction technology of oil refining wastewater containing phenol in the selection of extraction agent

by:Deyuan      2020-08-30
Phenolic compounds is a kind of prototype poison, individuals are toxic for all living things. Waste water containing phenol in water pollution control in China have also been listed as one of the key to solve harmful waste water. At present, the industrial wastewater containing phenol treatment with chemical oxidation method, incinerating, steam method, adsorption method, biochemical method, solvent extraction method, emulsion liquid membrane method, ultrasonic method, photocatalytic decomposition method and supercritical method, etc. Solvent extraction not only less equipment investment, cover an area of an area small, easy operation, low energy consumption, and can effectively recycled wastewater of phenolics, more suitable for high concentration phenol wastewater. By this article mainly aims at the refinery of the oil and distillation refining waste water, the solvent extraction method is adopted for processing.
tributyl phosphate - Wood is � � extraction
will filter wastewater containing phenol. Take a certain volume of oil refining wastewater transferred to the required pH. Will tributyl phosphate mixed with diesel oil according to certain volume ratio as need concentration of extraction solvent, then a certain volume of extraction agent and a certain volume of oil refining wastewater by extraction than common into 250 ml volumetric flask of iodine. Iodine volumetric flask to be included in the water bath temperature oscillator in the uniform temperature oscillation after a certain period of time, the mixed solution of iodine volumetric flask to let stand in the 250 ml separatory funnel stratification, measuring the lower the volume of a liquid, measuring a certain volume of liquid in lower bromide titration analysis of phenol content. Will after extraction of rich in phenol extraction agent and a certain quality score of extracting agent sodium hydroxide solution, according to a certain amount of extraction than put into 250 ml volumetric flask of iodine, together into the water bath temperature oscillator, constant temperature oscillation after a certain period of time, the iodine into 250 ml volumetric flask of liquid in the separatory funnel stand for layered, measuring the lower liquid volume, and take a certain volume of liquid in lower amount of bromide titration analysis and calculation of phenol content.
- dimethyl carbonate N-hexane extraction solution
to take a certain volume of oil refining wastewater required pH value. Dimethyl carbonate with n-hexane according to certain volume ratio of mixed as extraction agent, and then a certain volume of extraction agent and a certain volume of oil refining wastewater by extraction than put into 250 ml volumetric flask of iodine, together into the water bath temperature oscillator, under the uniform temperature oscillation after a certain period of time, will be mixed solution out into a 250 ml glass separating funnel stand for layered, measuring the volume of the lower liquid, measuring a certain volume of liquid in lower bromide titration analysis of phenol content.
N503 -
diesel solution extraction to N - 503 mixed with diesel oil according to certain volume ratio as extraction agent, N - adjustment 503 and diesel hybrid solution pH to 3 ~ 4. The mixture of acetic acid solution used for pH adjustment. Then a certain volume of extraction agent with a certain volume of oil refining wastewater into 250 ml volumetric flask of iodine. Adjust the use sodium hydroxide solution pH value of wastewater containing phenol or hydrochloric acid solution. Iodine volumetric flask to be included in the water bath temperature oscillator in the uniform temperature oscillation after a certain period of time, the iodine into 250 ml volumetric flask of solution in the separatory funnel stand for layered, take the lower fluid analysis.
to compare three kinds of extraction solvent extraction experiments can be seen, tributyl phosphate of the extraction rate of more than 99%, dimethyl carbonate extraction rate above 90%, the extraction rate of
N503 by more than 95%, the extraction rate is high, the extraction rate of tributyl phosphate, tributyl phosphate and N503 than the dosage of dimethyl carbonate to save. Although the diluent of n-hexane dosage of dimethyl carbonate thinner than tributyl phosphate and N503 diesel less, but the price of n-hexane is far higher than that of the diesel. Tributyl phosphate compared with N503, tributyl phosphate than N503 is low. So from the extraction agent solution using tributyl phosphate - Diesel solution extraction experiment than using dimethyl carbonate - And N503 - n-hexane solutions Diesel is better solution. Analysis: from the perspective of extraction ratio of tributyl phosphate extraction ratio of 1:1, dimethyl carbonate extraction ratio is 1:1, the extraction ratio of 1:2 N503, including N503 extraction than smaller.
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