EXTRACTION PURIFICATION OF A MIXTURE OF HEAVY VACUUM GAS OIL AND DEASPHALTING OIL EXTRACT FROM CARCINOGENIC HYDROCARBONS WITH A MIXED EXTRACTANT N- METHYLPYRROLIDONE - ETHYLENE GLYCOL
The results of a four-stage countercurrent extraction of carcinogenic polycycloarenes from a mixture of heavy vacuum gas oil and extract of deasphalizate dimethyl sulfoxide and a mixed extractant N-methylpyrrolidone - ethylene glycol are presented. The environmental requirements for aromatic softener oils for the tire industry in terms of the permissible amount of eight carcinogenic polycycloarenes no more than 10 mg / kg, including benzo (a) pyrene - no more than 1 mg / kg, are achieved using an extractant based on N-methylpyrrolidone in mass the ratio to raw materials is half as much as with dimethyl sulfoxide with a close yield of raffinate.