Promotion effect of Fe3O4@CPAM with different monomer ratios on microwave demulsification of heavy oil
In order to further study the efficient demulsification mechanism of chemical flooding,a new type of magnetic nanoparticle Fe3O4@CPAM with different monomer ratios(mass fraction of acrylamide and methacryloyloxyethyl trimethyl ammonium chloride)was synthesized,and this successful synthesis was confirmed through a series of characterization methods such as X-ray diffraction analysis,Fourier transform infrared spectroscopy analysis,thermogravimetric analysis,and vibrating sample magnetometer analysis.A comparative analysis was conducted on the effects of Fe3O4,Fe3O4@CPAM(monomer 20％),and Fe3O4@CPAM(monomer 25％)concentrations on the microwave demulsification of heavy oil.The study shows that a too high concentration can inhibit the de-mulsification effect,and only when the concentration is appropriate,can microwave coordinate with magnetic nanoparticles for de-mulsification.In addition,the promotion mechanism of magnetic nanoparticles for microwave demulsification was also revealed from the perspectives of oil droplet distribution and Zeta potential.The results show that when the magnetic nanoparticles Fe3O4@CPAM(monomer 20％)are used alone,the diversion ratio of the emulsion can reach 95.24％at the mass concentration of 175mg/L and sed-imentation time of 30 minutes;when the magnetic nanoparticles Fe3O4@CPAM(monomer 25％)are only used,the diversion ratio of the emulsion can reach 100％at the mass concentration of 200mg/L and sedimentation time of 10 minutes.At the microwave radia-tion power of 200 W and radiation time of 20 s,the mass concentrations of magnetic nanoparticles Fe3O4@CPAM(monomer 20％)and Fe3O4@CPAM(monomer 25％)are 75mg/L and 50mg/L,and the sedimentation durations are 30 minutes and 20 minutes,re-spectively;the diversion ratio of the emulsion can reach 96.49％and 99.10％,respectively.The above results have confirmed that there is a coupling synergy between microwave and the new-type magnetic nanoparticles,which can significantly reduce the amount of magnetic nanoparticles used.
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