| 主权项 |
1. A process to stabilize and to remove contaminants from unstable oil and to produce a stabilized diesel showing, according to ASTM method D46468 for at least one day, said process comprising the following steps of:
a) intimately contacting a stream of the unstable oil with an initial solvent having a dipole moment greater than 2, 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 step b) or c) and partially regenerated before being recycled to said process; wherein in step b) at least 70% wt of the impurities remain in the solvent phase; wherein in step d), at least one of each solvent is regenerated, for at least 50% wt, but for less or equal to 98% wt to obtain a regenerated solvent stream, before recycling, optionally, wherein the treated oil recovered from the first mixture is mixed with the treated oil recovered from the second mixture. |
