METHOD OF OILY FRACTION SELECTIVE REFINING Russian patent published in 1996 - IPC

FIELD: oil refining. SUBSTANCE: oily fraction is fed to the middle part of extractor and contacted with solvent which is added to upper part of extractor in the presence of antisolvent. The latter is fed to bottom part of extractor. Part of extractive solvent removed from bottom of extractor is recovered to extractor above antisolvent inlet level and at temperature not exceeding that of raw feeding; part of raffinate solution removed from upper of extractor is recovered to extractor between raw and extractive solution feeding and at temperature not above that at outlet of extractor. EFFECT: improved method of refining. 7 tbl, 2 dwg