关键词: 原油, 脱镍, 聚合物刷, 聚丙烯酸, 电脱盐

Abstract: To efficiently remove Ni from crude oils and also without corrosion occurring in the process, polymer brush with core-shell structure (PAA@SiO₂) was synthesized by radical polymerization， in which micro-sized SiO₂ as the core and polyacrylic acid as the shell. The synthesized materials were further characterized with Fourier transform-infrared spectrometer, thermogravimetric analysis and scanning electron microscope. Effect of PAA@SiO₂ on Ni porphyrin removal was studied and Ni removal mechanism was discussed. Experimental results suggested that, for the synthesized PAA@SiO₂, the grafting mass fraction and calculated molecular mass of PAA are 7.03% and 351.5 g/mol, respectively. Under the conditions of PAA@SiO₂ doses is 6000μg/g, water/oil mass ratio is 0.08, electric desalting temperature is 125 ℃, low-voltage field strength is 600 V/cm and high-voltage field strength is 1200 V/cm, Ni removal ratio can be 89.9% after three times continuous removal processes. Experimental study indicates that PAA@SiO₂ with core-shell structure can effectively remove Ni from crude oils. Thus this study provides a different strategy for new materials which can be used as crude oil demetalization.

Key words: crude oil, Ni removal, polymer brush, polyacrylic acid, electric desalting