Upgrading of Wash Oil through Reduction of Nitrogen-Containing Compounds

As part of improving the quality wash oil, reduction three kinds nitrogen-containing compounds (NCs), including quinoline (QU), iso-quinoline (IQU), and indole (IN), found in oil was examined by liquid–liquid equilibrium extraction. The an aqueous solution formamide were used as raw material solvent, respectively. Increasing volume fraction water solvent initial state (yw,0) resulted a decrease distribution coefficients each NC, while inversely, selectivity NC reference to 2-methylnaphthalene increased. ranges QU, IQU IN at yw,0 = 0.05~0.3 19~57, 19~56 50~79, Through five stages extraction performed under condition 0.05, concentrations QU contained raffinate recovered fifth stage reduced about 69% 65% compared those oil. concentration particular, useful compound chemical industry, which is for pharmaceuticals, dyes, fragrances, 93.4% through five-stage operation. method this study highly efficient reducing present showing feasibility method.