| 摘要 |
FIELD: petroleum processing and petrochemistry. ^ SUBSTANCE: lube fractions are brought into contact with N-methylpyrrolidone in extraction tower according to three-step countercurrent purification scheme to form raffinate and extract solutions. When distillate fraction II (300-400°C) is purified, of sulfoxide is preliminarily added in amount of 0.1-0.5% based on the weight of solvent. Distillate fraction III (350-420°C) is then purified after addition to solvent of 0.5-1.5% of extract obtained from purification of distillate fraction II. ^ EFFECT: deepened purification of raffinate, increased yield of raffinate as commercial product, and enabled qualified application of extract by-product. ^ 11 tbl, 6 ex |
