METHOD OF OIL FRACTIONATION Russian patent published in 2014 - IPC C10G7/00 B01D3/14 

FIELD: oil-and-gas industry.

SUBSTANCE: proposed method comprises heating of oil by vapours of hydrocarbon vapours, heating it in the furnace, stripping of the wide fraction of hydrocarbons with production of fractionation residue and processing of said fraction. Oil is pre-divided into two parts, one being heated by vapours of vacuum gas oil and another one being heated by vapours of said fraction. Both parts are mixed, at least one part of said mix is heated by vapours of the first stage of fractionation while fractionation is performed in three steps. At first step, oil is stripped by gaseous products of vacuum gas oil and vacuum residue processing to get vapours and residue. At second step, vapours of the first fractionation step are subjected to partial condensation by oil cooling for production of heavy gas oil fraction and vapours to be condensed by oil cooling for production of second fractionation stage and wide fraction of hydrocarbons. At third step, residue of the first fractionation stage is mixed with liquid product of vacuum gas oil processing and subjected to vacuum separation to get vacuum residue. The latter are withdrawn from the plant for further processing to get gaseous products and residue as well as vacuum gas oil vapours to be condensed by cooling for production of vacuum gas oil and uncondensed gases to be extracted with the help of evacuation device. Vacuum gas oil is heated by its vapours, mixed with heavy gas oil fraction and derived from the plant to get gaseous and liquid products.

EFFECT: additional fractionation of black oil, ruled out heat losses, power saving.

2 cl, 1 dwg