Patent ID: 9458391
Filing Date: 2016-10-04
CPC Classification: B01D,C09K,C10G,C10L

Claim Text:
1. A process to stabilize and to remove contaminants from unstable oil, the process comprising the following steps of: a) intimately contacting a stream of the unstable oil with an initial solvent chosen among N-methyl pyrrolidone, furfural, dimethyl formamide, phenol, pyridine, dimethyl acetamide, dimethyl sulfoxide, propylene carbonate, and mixtures thereof to obtain two mixtures, a first mixture being of an oil-solvent type, which comprises treated oil, solvent, and impurities, and a second mixture being of a solvent-oil type, which comprises treated oil, solvent, residues, and impurities; b) separating the treated oil, present in the first mixture obtained in step a), from the solvent, leaving most of the impurities in the solvent phase; c) separating the solvent and the treated oil, present in the second mixture obtained in step a), from the residues; and d) recycling, in the process, one or more solvents with impurities, recovered in steps b) or c), and partially regenerated before being recycled to said process; wherein in step b) at least 80% of the impurities remain in the solvent phase; wherein in step d), at least one of each of said solvent is regenerated, for more than 50% wt. but for less or equal to 98% wt. to obtain a regenerated solvent stream, before recycling; wherein the initial solvent to unstable oil ratio ranges from between 5/1 to 1/5; and optionally, wherein the treated oil recovered from the first mixture is mixed with the treated oil recovered from the second mixture.