Abstract
China's Gaosheng crude oil is characterized as being high in nickel and low in vanadium. Nickel porphyrins were extracted with dimetrylformamide, concentrated by absorption chromatography and demetallized with methylsulfonic acid. The concentrate of demetallized porphyrins was then separated by centrifugal thin-layer chromatography, in which DPEP, ETIO, Di-DPEP, Rhdo-ETIO, Rhdo-DPEP and Rhodo-Di-DPEP types of porphyrin were identified by mass spectrometry and UV-VIS spectroscopy. The possible geochemical pathways from DPEP to Di-DPEP and from Di-DPEP to Rhodo-DPEP series are discussed.
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