Industrial & Engineering Chemistry Research
Industrial & Engineering Chemistry Research
5 years ago

Demetalization of Heavy Oil Based on the Preferential Self-assembly of Heavy Aromatics in Supercritical Water

Demetalization of Heavy Oil Based on the Preferential Self-assembly of Heavy Aromatics in Supercritical Water
Liu-Yi Bao, Kai Wang, Yu Xing, Wei-Kang Yuan, Pei-Qing Yuan, Zhen-Min Cheng
Demetalization of heavy oil through pyrolysis in the presence of subcritical water or supercritical water (SCW) was experimentally investigated. At a high water-to-oil ratio and high water density, the occurrence of pyrolysis can be transferred to the SCW phase. Driven by the π–π attractive interaction between aromatic sheets and the superb diffusivity in SCW, the coke-like self-assembly of metal-containing heavy aromatics occurs spontaneously and rapidly. The self-assembly behavior of aromatics in SCW depends not only on the thermodynamic state of SCW but also on the average scale of aromatics. With the aid of self-assembly in dense SCW, the condensation of metal-containing heavy aromatics, distributed mainly in a vacuum residue, to coke is significantly accelerated, by which the rate of demetalization is improved simultaneously. Owing to the preferential self-assembly of metal-rich heavy aromatics, an increasing yield of liquid products can also be obtained under an optimized SCW environment.

Publisher URL: http://dx.doi.org/10.1021/acs.iecr.7b00102

DOI: 10.1021/acs.iecr.7b00102

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