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Nickel and vanadyl porphyrins in Arabian heavy crude oil

Al-Hajji, Adnan Ahmed (1990) Nickel and vanadyl porphyrins in Arabian heavy crude oil. Masters thesis, King Fahd University of Petroleum and Minerals.

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This study reports the isolation and characterization of nickel and vanadyl porphyrins in the residue (1000??F) and asphaltenes from Arabian Heavy crude oil. The residue was obtained by distillation of crude oil, where as the asphaltenes were precipitated by n-haptene from the crude oil. Several literature-reported methods and modified separation methods were tried to isolate the nickel and vanadyl porphyrins from the residue and the asphaltenes. Metalloporphyrins were first extracted from the residue with methanol. The nickel porphyrins were separated from vanadyl porphyrins by means of adsorption chromatography on silica gel and alumina using solvents of increasing polarity. The metalloporphyrins were first soxhlet extracted from the asphaltenes by different proportions of benzene in acetonitrile. Adsorption chromatography on silica gel and alumina, using solvents of increasing polarity, was used to separate the vanadyl porphyrins. No nickel porphyrins were detected in the asphaltenes. The chromatographic separation process was monitored by ultra violet/visible spectrophtometry. Both of the nickel and vanadyl porphyrins were identified and characterized by ultraviolet/visible spectrophotometry and mass spectrometry. Five types of homologous series of vanadyl porphyrins were identified in the residue and asphaltenes:deoxophylleoerythroetrioporphyrins (DPEP, etioporphyrins (Etio), benzoDPEP, benzoEtio, and tetrahydroDPEP. Only two types of homologous series of nickel porphyrins were found in the residue: Etio and benzoDPEP.



Item Type:Thesis (Masters)
Date:January 1990
Date Type:Completion
Subjects:Chemistry
Divisions:College Of Sciences > Chemistry Dept
Creators:Al-Hajji, Adnan Ahmed
Committee Advisor:Ali, A. F. M. Abdul
Committee Members:Perzanowski, Herman and Bukhari, Ahmed
ID Code:9966
Deposited By:KFUPM ePrints Admin
Deposited On:22 Jun 2008 16:53
Last Modified:25 Apr 2011 09:40

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