FIELD: petroleum processing. SUBSTANCE: lube fractions are refined by countercurrent stream of N- methylpyrrolidone supplemented by calcium alkyl salicylate or calcium sulfonate in amounts 0.0005 to 0.003 wt.% of raw material at temperature corresponding to existence of two-phase system. EFFECT: increased yield of refined product without loss in quality. 1 tbl
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Authors
Dates
2001-02-27—Published
1999-04-26—Filed