关键词: asphalt;particle;solvent;recovery;supercritical fluid extraction

Abstract: A continuous three-stage supercritical fluid extraction (SFE) process with a capacity of
1.0 kg·h-1 was setup to extract petroleum residue by pentane to obtain more oil for
further upgrading. A discharging system integrated to the bottom of the extractor was used
to recover solvent as gas while asphalt was obtained as fine particles. The influence of
operating conditions on the yield and quality of extracts, i.e., deasphalted oil (DAO) and
resin, was studied in the range of temperature 150-220℃, pressure of 4.0-6.0 MPa and the
mass ratio of solvent to oil feed (S/O) 2.5-5.0. The particle size distribution, apparent
forms and the packing density, which vary with operating pressure, were measured. The
particle structures were observed by SEM as well. With the modification to conventional
processes, furnace can be eliminated for solvent recovery from asphalt phase, so as to
reduce energy consumption.

Key words: asphalt, particle, solvent, recovery, supercritical fluid extraction