Control method for solvent refining lubricating oils

摘要

In a solvent refining process a lubricating oil stock is solvent extracted to yield a primary aromatics-lean raffinate and a primary aromatics-rich extract. Aromatics content of primary raffinate is controlled by manipulating extraction temperature and solvent dosage. Primary extract is separated (settled) to form a secondary raffinate and a secondary extract. The aromatics content of secondary extract is controlled by manipulating settling temperature.