Influence of the Composition of the Sulfuric Acid Cation Exchanger on the Efficiency of Chromatographic Purification of Petroleum Vanadyl Porphyrins

Advances and Challenges in the Molecular Characterization of Petroporphyrins

“…97 99 With a silica gel/sulfuric acid/water weight ratio of 60/15/25, up to ~50% of vanadyl porphyrins pass through the column without retention, whereas nonporphyrin impurities are retained on the stationary phase. 99 Vanadyl porphyrins isolated from asphaltenes derived from a heavy oil from the Volga-Ural basin were purified using a novel strong acid cationexchange resin and asphaltene sulfocationite method. 100 Subsequent characterization of purified porphyrins by MALDI ToF-MS showed that the composition of isolated vanadyl porphyrins depended on the chemical nature of sulfocationite.…”

“…Recent novel separation methods to purify porphyrins from heavy oil have been investigated and show promise for expanding the compositional knowledge of porphyrin composition. Mironov et al developed a method for chromatographic preparation of high-purity vanadyl porphyrins based on a sulfuric acid cation exchanger readily prepared from silica gel and sulfuric acid . With a silica gel/sulfuric acid/water weight ratio of 60/15/25, up to ∼50% of vanadyl porphyrins pass through the column with no retention, whereas nonporphyrin impurities are retained on the stationary phase .…”

“…Mironov et al developed a method for chromatographic preparation of high-purity vanadyl porphyrins based on a sulfuric acid cation exchanger readily prepared from silica gel and sulfuric acid . With a silica gel/sulfuric acid/water weight ratio of 60/15/25, up to ∼50% of vanadyl porphyrins pass through the column with no retention, whereas nonporphyrin impurities are retained on the stationary phase . Vanadyl porphyrins isolated from asphaltenes derived from a heavy oil from the Volga-Ural basin were purified based on a novel strong acid cation-exchange resin and asphaltene sulfocationite method .…”