METHOD OF LUBRICANT OIL DEWAXING Russian patent published in 1997 - IPC

FIELD: petroleum processing. SUBSTANCE: mixing of paraffin-containing raw material with cold solvent, filtrate solution, or their mixture supplied into each section of multisection apparatus is effected with raw mixture stream formed when injecting raw mixture from preceding section into raw mixture in given section. Suspension obtained is further cooled to filtration temperature and filtered to separate precipitated paraffin crystals, whereas solvent is recovered from filtrate solution and precipitate. EFFECT: speeded up filtration of paraffin crystal precipitate, increased yield of dewaxed oil, and reduced power consumption. 3 dwg, 1 tbl