OIL FRACTIONING METHODS Russian patent published in 2008 - IPC C10G7/02 

FIELD: chemistry; technological processes.

SUBSTANCE: method involves raw material feed into first distillation column, with obtained vapours fed to reflux drum to obtain gas and light gasoline fraction, feeding of first column residue to second column with obtained vapours fed to drum to obtain gas and light gasoline fraction and to extract gasoline and diesel fractions from side streams of the second column and fuel oil from the second column bottom. Gases from reflux drum tops of both first and second columns are fed to absorbers sprayed respectively by diesel fraction extracted from steaming section bottom and by bottom circulation reflux of second column after cooling. Dry and fatty gases are extracted from absorber tops, bottom circulation reflux is heated before feeding to column, diesel fraction from the first absorber bottom is heated and fed to steaming section top of diesel fraction, and the steaming section top vapours are fed to the first column to a section between raw material and heated flow inputs.

EFFECT: more distinctive gas separation into dry and fatty components and improved quality of separation products.

6 cl, 1 dwg, 2 tbl