Analysis of mechanism of supercritical CO2 extraction to remove phenol from coking wastewater
Coking wastewater treatment is difficult,there are many kinds of organic pollutants,phenol as one of the most difficult to degrade products,how to efficiently remove phenol is a big problem.In this paper,the supercritical CO2 extraction method was used to explore the effects of process parameters such as pressure,temperature,CO2 residence time,entrainer concentration,and CO2 flow rate on the removal effect of phenol in coking wastewater by using supercritical CO2 extraction method.Univariate experiments were used to determine the optimal parameters,and orthogonal experiments were designed based on IBM SPSS Statistics software to optimize the parameters.The results showed that the amount of ethanol added had the most significant effect on the removal rate of phenol,and the average removal rate of phenol was 99.87％under the optimal process conditions.In addition,the mechanism of phenol removal by supercritical carbon dioxide extraction method was analyzed based on Gaussian 09W software.The simulation results show that the hydrogen atoms on the hydroxyl group in the phenol molecule form hydrogen bonds with the oxygen atoms in the ethanol molecule,and the hydrogen atoms in the ethanol molecule form hydrogen bonds with the oxygen atoms in the CO2 molecule.The implementation of this research strategy provides a new direction for the removal of phenol in coking wastewater,a feasible scheme for the recycling and reuse of phenol,and a new idea for the treatment of other wastewater rich in phenol-rich toxic and harmful organic compounds.
Supercritical CO2 extractionCoking wastewaterPhenolOrthogonal experimentMechanism analysis
万方数据
