Continuous process for deasphalting and demetallating a residue from crude oil distillation

摘要

A continuous process for deasphalting and demetallating a residue from crude oil distillation, by means of dimethyl carbonate as extraction solvent, comprises: mixing a residue from crude oil distillation with a recycled liquid stream containing oil and dimethyl carbonate, in order to produce a homogeneous solution; cooling said homogeneous solution and separating a refined light, liquid, phase; an extracted middle phase; and a heavy phase containing asphaltenes; recovering a primary, deasphalted/demetallated oil from said light phase; partially recycling said middle phase to the mixing step, and recovering a secondary deasphalted oil from the residual fraction; recovering asphaltenes from said heavy phase.