Experimental Study of Polyacrylic Acid Brush Removal of Nickel Porphyrin From Crude Oils

Experimental Study of Polyacrylic Acid Brush Removal of Nickel Porphyrin From Crude Oils

Crude oil

Corrosion

Scanning electron microscopy

Desalination

Silica

Silicon

Thermogravimetric analysis

Fourier transform infrared spectroscopy

Organic acids

Shells (structures)

Nickel

Nickel compounds

Porphyrins

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 6000 g/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. 2021, Editorial Office of Acta Petrolei Sinica(Petroleum Processing Section). All right reserved.

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Shiyou Xuebao, Shiyou Jiagong/Acta Petrolei Sinica (Petroleum Processing Section)

2021

Liu, Siyuan

Geng, Tong

Xu, Jun

Ren, Mannian

Cao, Fahai

journalArticle

10018719

10.3969/j.issn.1001-8719.2021.01.001