METHOD FOR DEMETALLIZING HEAVY OIL STOCK Russian patent published in 2017 - IPC C10G21/00 C10G21/06 C10G21/12 C10G53/00 C10C3/08 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil refining industry, and in particular to processes for deasphalting and demetallizing heavy oil stock by using solvent methods. The method of the demetallization of heavy oil stock comprises mixing the initial heavy oil stock with an organic solvent ensuring the complete dissolution of all components of the heavy oil stock and the formation of a uniform homogenous solution, wherein the ratio of the organic solvent to the initial oil stock and the mixing temperature are selected according to the condition providing the complete mixing of the components, the prevention of the organic solvent evaporation and the absence of the effects of the resulting mixture phase separation. Then the countercurrent contacting of the resulting mixture with carbon dioxide is performed under conditions that allow the presence of carbon dioxide in a supercritical state, namely at the temperature of 50-100°C, the pressure of 100-350 bar and the weight ratio of carbon dioxide: the heavy oil stock from 13:1 to 35:1, with the subsequent separation of the extracted light hydrocarbon components with the reduced content of heavy metals from the heavy components of the initial oil stock.

EFFECT: invention provides increasing output of the deasphaltizate with low metal content, increasing the selectivity of the demetallization process by using cheap, available and environmentally friendly carbon dioxide as the primary solvent, increasing efficiency of the process of extracting lighter components and the sedimentation of heavy components of the initial oil stock.

9 cl, 1 dwg, 1 tbl, 4 ex