FRACTIONATION OF DE-ASPHALTED OIL OF VACUUM RESID USING PREPARATIVE HIGH PERFORMANCE LIQUID CHROMATOGRAPHIC SEPARATIONS

摘要

Two quantitative HPLC separation techniques to fractionate de-asphalted oils (DAOs) into seven classes of compounds (saturates, 1-, 2-, 3-, & 4+- ring-aromatics, sulfides, and polars). In the first step, named as Silica Gel Separation (SGS), the DAO of a petroleum vacuum resid is separated in to four classes of compounds, namely sat¬ urates, aromatics, and sulfides utilizing two silica gel packed stainless steel columns and a silver nitrate loaded strong-cation-exchange column. In the second step, named as Aromatic Ring Class (ARC) separation, the aromatic fraction obtained in SGS (described above) is further fractionated at very low temperature (about -40 degrees centigrade) into 4 fractions, namely 1-ring, 2-ring, 3-ring, and 4+-ring aromatics utilizing a [3-(2,4-dinitroamino-)propyl]-silica gel (DNAP-silica) column.