| 摘要 |
FIELD: petroleum processing; petrochemical engineering. SUBSTANCE: when selective purification of oil fractions is carried out via countercurrent contacting raw material fed into middle part of extractor with solvent entered on the superior theoretical step of extractor and in presence of antisolvent entered on the lower theoretical step of extractor with subsequent solvent recovery from extract and raffinate solutions, a part of extract, after solvent recovery, is fed into extractor between solvent and antisolvent inlets at a temperature not exceeding that at solvent inlet and being not lower than temperature at raw material inlet. As solvent, in particular, phenol, furfural, and N-methylpyrrolidon may be used. EFFECT: increased yield of raffinate. |
