Hot Water Cyclonic Extraction Technology And Its Application In Removing Oil From Porous Medium

Porous medium (such as catalyst, soil, etc.) is hard to treat safely after adsorbing paraffin, aromatics, asphalt, gelatin, heavy metal pollutants, etc. At present, hot water extraction technology has the advantage on low porosity oily porous medium treating at home and abroad, such as sludge treating and soil washing, which shows the tempting prospects. But, hot water extraction technology has not been used to treating high porosity oily porous medium. And, in theory research of hot water extraction technology, there are some obvious deficiency, such as the kinetics of hot water extraction, enhancing mechanism of hot water extraction, etc.The paper is based on hot water extraction principle, and carried out mechanism research of enhancing hot water extraction through particle rotation in rotating flow. The cold and hot model experimental spent catalysts of STRONG (Sinopec Technology Residual Oil New Generation, STRONG) ebullated residual oil hydro-treating have been studied. And, the optimization of operating parameters for hot water extraction process, the kinetics of hot water extraction process, the effect of hot water cyclonic extraction process have been studied through experiments. The main research conclusions are as follows:(1) The kinetics of contaminant desorption during the process of hot water extraction has been researched through the experiment on removing contaminant from STRONG’s hot model experimental spent catalysts by hot water extraction. The process of oil contaminant removal process has a rapid stage of10min, and the oil contaminant removed in0-10min accounts for93.4%of all oil contaminant, which could be removed. Then the removal process tends to be flat. The removal process is the results of superimposition of multiple removal processes of different components in the oil contaminant of the STRONG’s hot model experimental spent catalysts.(2) After hot water cyclonic extraction, oil rate of STRONG’s hot model experimental spent catalysts reduces to11.3%,5.76%lower than hot water extraction. And, capillary oil removal efficiency increased by31.9%. Efficiency of hot water cyclonic extraction to n-alkanes (C12～C21) is13～190%higher than that of hot water extraction and becomes more significant with improvement of the molecular weight of n-alkanes.(3) Particle rotation behavior in rotating flow could enhance the process of hot water extraction. When the particle size RP, density ρP and pore size rk1of oily porous medium and the density ρo of hydrocarbon contaminants are smaller, and surface tension γ of hydrocarbon contaminants is bigger, the particle rotation speed to removing hydrocarbon contaminants is bigger. In the paper, hot water cyclonic extraction was carried on through25mm hydrocyclone. In the process of hot water cyclonic extraction, particle rotation could reach6860rad/s and improved efficiency of hot water extraction.