Simulation And Study On Extraction Process Of Shale Oil Phenol-wastewater

Shale Oil is formed by pyrogenation of organic matter in oil shale. Meanwhile, a large of phenol wastewater produced in pyrogenation couldn't be discharged, due to high concentration of phenol. It seriously restricts the spread of industrialization of Shale Oil. Phenols is strong toxic and refractory organic pollutant in industrial wastewater. And it is basic material of organic chemical industry, with high economic value. Until now, lots of research has been done to handle methods and recover of phenol wastewater. But the study to Shale Oil phenol-wastewater remains scarce. We used solvent extraction method, combined experiment and Aspen Plus software simulation, and carried out Pilot studies on the treatment of Shale Oil phenol-wastewater.We maked analyses in Shale Oil phenol-wastewater and replace the wastewater with Phenol simulation wastewater. The absorb-phenol capability of different extracting agents was compared through Phase equilibrium experiments. We tried to simulate and analyse the extraction performance of the selected extraction agent. This paper applied Aspen Plus software, taked NRTL equation as property method, and established extraction model, in order to the absorb-phenol capability in extraction process. We corrected the model parameter of NRTL by detailed data of phase balance experiment to improve the accuracy of simulation.According to experiments, Methyl-Tert-Pentyl Ether (TAME) was thought of the most appropriate extractant. The results indicated that TAME possessed excellent capacity of extraction, with the distribution coefficient of phenol among 40 to 60 and the extraction efficiency above 95% when pH value is among 2 to 10. The process flows were researched in crosscurrent extraction, countercurrent extraction and extraction tower. The sensitivity was analysed for phase ratio, temperature, number of plates, plate efficiency, et al. When the phase ratio is 2, temperature is 25℃and plate efficiency is 0.8, phenol concentration of final wastewater dropped to 0.0886 mg/L in 4-stage extraction tower. The efficiency is up to 99.8%. Thus TAME has excellent performances to absorb phenol. TAME is perfect as an extractant for extracting phenol wastewater.