EFFECT OF WATER ON SELECTIVITY AND SOLVENT POWER OF PROPYLENE CARBONATE, DIMETHYL SULFOXIDE, AND WHEN CLEANING THE AROMATIC OILS FROM CARCINOGENIC HAZARDOUS COMPONENTS
The effect of minor impurities of water in dimethyl sulfoxide and the propylene carbonate when extracting the polycyclic aromatic hydrocarbons from aromatic oils (for example, residual oil extract 0258-134-00148636-2004 TU) in a multi-stage countercurrent extraction have been studied. The variation of water concentration from 1 to 3% to dimethylsulfoxide shows that the permissible water impurity is less than 2%. Higher water concentrations lead to a marked increase in the polycyclic aromatic hydrocarbons content in the treated aromatic oil flowing out of the requirements of normative documents. In case of propylene carbonate, water concentration in a mixture should not exceed 5%.