METHOD OF TWO COLUMN PROPANE DEASPHALTING OF OIL RESIDUES Russian patent published in 2015 - IPC C10G21/14 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil refining industry. Invention relates to the method of two column propane deasphalting of the oil residues in two connected in series extractors, via one feed is mixed with liquid propane, mixture is cooled and supplied to the first extractor to be separated to solution of asphalt-free oil I and asphalt phase. Feed is mixed with part of propane with cooled mixture supply above the bottom inlet of the residual propane volume, solution of asphalt-free oil I without heating at top of the first extractor is supplied to bottom of the second extractor, where due to temperature increase at top is separated to recycle stock and solution of asphalt-free oil II, with propane regeneration from it by gradual heating and pressure decreasing in the propane evaporators to pressure in propane condensation system, with additional heating of the solution of asphalt-free oil II from the last propane evaporator to 240-250°C, with recycle stock return by pump to top of the first extractor, with supply of the produced products to strippers operating without water vapour supply to them.

EFFECT: improved quality of asphalt-free oil and asphalt, reduced power consumption.

2 cl, 1 ex