Published August 2019

Supercritical extraction of oil and its heavy residues in the presence of CO2 (n–heptane) acetone fluids

S.Y. Rashidova

Supercritical extraction of oil components in the presence of CO2 and co-solvents of acetone and n–heptane has been carried out. Supercritical extraction in the presence of CO2-acetone increasing co-solvent from 5 to 25 %, at the temperature of 20 оC leads to the increase of viscosity of deasphaltizate up to 21.2 mm2/s, the density – to 872.1 kg/m3, the cocking behavior of deasphaltizate to 2.33 %, and asphalt-resin substances up to 3.46 %. During tar deas-phaltization, the regeneration of solvent is conducted in normal conditions. According to the classical scheme, the yield of P-28 base oil (bright stock) comprises 30.3–33.1 %. In presented scheme in supercritical conditions with CO2 and co-solvent, the yield of residue base oil increases. The advantage of this process is the usage of a single solvent that leads to the process simplification.