METHOD OF SIMULTANEOUS PRODUCTION OF ENVIRONMENTALLY SAFE DIESEL FUEL AND AROMATIC SOLVENT Russian patent published in 2002 - IPC

FIELD: petroleum processing and petrochemistry. SUBSTANCE: invention can be used for simultaneous production, from hydrofined diesel fraction, of (i) environmentally safe diesel fuel satisfying requirements for content of aromatic hydrocarbons and (ii) aromatic solvents containing at least 98 wt.% aromatic hydrocarbons. Method consists in extracting aromatic hydrocarbons from hydrofined diesel fraction with two solvents: one polar and the other nonpolar (pentane), the former being dimethylformamide or dimethylacetamide containing 3-5 wt.% of water and ratio of the former and the latter to raw material being, respectively, (3-5):1 and (1-1.5):1. Extract is concentrated to 98-99 wt.% in solvent-regeneration column using azeotropic rectification of extract phase with polar solvent present in extract phase. EFFECT: improved quality of products. 1 dwg, 2 tbl, 4 ex