THE COMPARATIVE STUDY OF THE SOLVENT EXTRACTIVE ACTIVITY FOR SELECTIVE TREATMENT RESIDUAL OIL EXTRACT FROM POLYCYCLIC AROMATIC HYDROCARBONS
The aim of the work was to test the solvents (PC and DMSO) in selective purification of aromatic components in a countercurrent extraction for the production of safe-carcinogenic plasticizing oils. The polycyclic aromatic hydrocarbons (PAHs) removal from residual oil extract was carried out under comparable conditions in a multistage countercurrent extraction process using propylene carbonate (PC) and dimethyl sulfoxide (DMSO). PC and DMSO belong to the fourth hazard class according to GOST 12.1.007-76 and are practically safe in operation. The experiments demonstrate that both solvents enable obtaining REACH requirements corresponding product in respect of carcinogenic PAHs content including benzpyrene. PC was found to have a lower solvent ability but higher selectivity than DMSO.