METHOD OF ISOLATING AROMATIC HYDROCARBONS FROM THEIR MIXTURE WITH NON- AROMATIC HYDROCARBONS Russian patent published in 1999 - IPC

FIELD: petrochemical processes. SUBSTANCE: extractants for isolation of aromatic hydrocarbons from their mixture with non-aromatic hydrocarbons, in particular, from reforming catalysates, are diethylene glycol/N-formylmorpholine and triethylene glycol/sulfolane mixtures containing 5-6 wt % water. By that, extractant-to-raw material ratio is decreased by 25-30% as compared to di- and triethylene glycols, temperature is lowered from 150 to 100- 120 C, and recycle flow from 80-90 to 30-60 wt %. Components of mixed extractants in pairs have virtually the same boiling temperatures, which allows constant ratio of extractants to be maintained in the course of their regeneration. EFFECT: enhanced process efficiency. 2 tbl, 6 ex