| 摘要 |
FIELD: petroleum processing and lubricants. ^ SUBSTANCE: lubricating oil fraction is preliminarily combined with low-boiling hydrocarbon solvent and stepwise extraction is then conducted at 40-55°C using dimethylsulfoxide as selective solvent. ^ EFFECT: increased degree of purification without using surfactants complicating and raising in price purification process, reduced consumption of solvent (by 30-40%) and power. ^ 1 tbl, 4 ex
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