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
| Title | Year | Author | Number |
|---|---|---|---|
| LUBE FRACTION PURIFICATION PROCESS | 2003 |
|
RU2243986C1 |
| METHOD OF PRODUCING BASE OIL HAVING LOW CONTENT OF SULPHUR AND ECOLOGICALLY CLEAN AROMATIC FILLER MATERIALS AND CAOUTCHOUC AND RUBBER PLASTICISERS | 2010 |
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RU2450045C1 |
| OIL FRACTION PURIFICATION METHOD | 2009 |
|
RU2400526C1 |
| METHOD OF OBTAINING OIL PLASTICISER | 2012 |
|
RU2531271C2 |
| METHOD FOR CLEANING MINERAL OILS | 0 |
|
SU1011672A1 |
| PROCESS FOR MANUFACTURE OF LOW-VISCOSITY INDEX OILS | 2000 |
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RU2184137C1 |
| METHOD FOR SELECTIVE PURIFICATION OF PETROLEUM OIL FRACTIONS (VERSIONS) | 2009 |
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RU2435828C2 |
| METHOD OF OBTAINING PROTECTIVE WAX | 2004 |
|
RU2343186C2 |
| METHOD FOR CLEANING MINERAL OILS | 0 |
|
SU1002347A1 |
| METHOD OF PURIFYING OIL LUBE FRACTIONS | 1997 |
|
RU2127297C1 |
