PROCESS FOR DEASPHALTING AND DEMETALLIZING PETROLEUM RESIDUES

摘要

PROCESS FOR DEASPHALTING AND DEMETALLIZING PETROLEUM RESIDUES A process for deasphalting and demetallizing petroleum vacuum distillation residues using dimethylcarbonate (DMC) in the presence of an overpressure of carbon dioxide (CO2) and comprising: - mixing a vacuum distillation residue with dimethylcarbonate (DMC) under a pressure of CO2, under temperature and pressure conditions such as to maintain the DMC in a prevalently liquid state, and forming a homogeneous solution with the deasphalted oils; - cooling the entire system to a temperature such as to form three phases; - then venting the gas at this temperature; - recovering a deasphalted and partly demetallized primary oil from the light phase; - recovering a deasphalted and partly demetallized secondary oil from the intermediate phase; f) recovering the used DMC for its possible reuse.