| 摘要 |
The invention concerns a method of deasphalting a heavy feedstock by liquid-liquid extraction, said method comprising at least two steps of deasphalting in series carried out on the feedstock to be treated, making it possible to separate at least one asphalt fraction, at least one heavy deasphalted oil fraction, referred to as heavy DAO and at least one light deasphalted oil fraction, referred to as light DAO, at least one of said deasphalting steps being carried out by means of a mixture of at least one polar solvent and at least one apolar solvent, said deasphalting steps being implemented in subcritical conditions for the mixture of solvents used. |
