| 摘要 |
The present invention concerns a method for the selective deasphalting of a heavy feedstock by liquid-liquid extraction in one step in an extraction medium, said extraction being carried out by means of a mixture of at least one polar solvent and at least one apolar solvent, so as to obtain an asphalt phase and a deasphalted oil DAO phase, the proportions of said polar solvent and said apolar solvent of the solvent mixture being adjusted depending on the properties of the feedstock and the desired asphalt yield, said method being implemented in subcritical conditions for the mixture of solvents. |
