| 摘要 |
FIELD: petroleum processing. SUBSTANCE: in a process of selective purification of lube fractions by way of countercurrently contacting raw material, fed into middle part of extractor, with solvent, fed into upper part of extractor, in presence of antisolvent, fed into lower part of extractor, followed by recovery of solvent from raffinate and extract solutions to produce raffinate and extract, a part of extract at a temperature not exceeding that in raw material inlet is returned into lower part of extractor between inlets for raw material and extract. Method may be applied in phenol, furfurol, N-methylpyrrolidone, etc. purification processes. EFFECT: increased yield of raffinate on existing extraction equipment. |
