Deasphalting of Atmospheric Residue using n-Pentane as a Supercritical Fluid

摘要

In order to reject the asphaltenes from atmospheric residue remaining after distillation of crude oil, supercritical extraction has been carried out by n-pentane solvent The experiments were performed at 483 K, 503 K and 523 K with pressure range from 4.4 MPa to 12.0 MPa to investigate the characteristics of extraction system. The extraction yield had shown to be increased with the system pressure and the temperature approaching down to critical state of n-pentane from the supercritical region. GC analysis of extracted oil revealed that the earlier extracts contain relatively lighter compounds, and the carbon number distribution of the extracts had shifted toward the heavier carbon number with lapse of operation time. As a result of the modeling with the atmospheric residue-n-pentane system, the calculated values relatively approached the experimental values.