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Investigation of nitrogen compound types in high-boiling petroleum distillates form Saudi Arabian crude oils.

Ali, Mohammed Ashraf (1987) Investigation of nitrogen compound types in high-boiling petroleum distillates form Saudi Arabian crude oils. Masters thesis, King Fahd University of Petroleum and Minerals.

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This study aims at the selective separation of acids, bases, and neutral nitrogen compounds from high-boiling distillates (370 - 535 c) of Arab Heavy and Arab Medium crude oils. Preliminary work was carried on all four Saudi Arabian crude oils and their distillates in the boiling range 370 - 535 C (700 - 1000 F). The distillates were prepared using atmospheric and vacuum distillation. The study has shown that the basicity, aromaticity, average molecular weights and degree of ring condensation in distillates increase with an increase in heteroatomic contents, carbon residues and viscosity of the material. Acids and bases were separated with anion and cation exchange resins respectively while the neutral nitrogen compounds were removed by complexation with ferric chloride supported on Attapulgus clay. These fractions were further separated into distinct nitrogen compounds types namely pyridines, pyrroles and amides using high performance liquid chromatography on neutral alumina. A nonaqueous potentiometric titration method was developed to determine the basic and nonbasic nitrogen in the distillates and the separated fractions. Titration of distillates and HPLC fractions also led to the determination of strong and weak basic nitrogen. A chromatographic-Infrared method was used for the quantitative determination of major compound types. The results were compared with titration and total nitrogen data. Comparison of the results from the two methods has shown that these techniques can be employed for the determination of compound types in complex petroleum fractions. Characterization of nitrogen compound type was made on the basis of infrared and ultraviolet spectroscopy. Vapor pressure osmometry was used to determine the average molecular weights. Characterization of individual nitrogen compounds was accomplished using gas chromatography and gas chromatography-mass spectrometric analysis. Sixteen nitrogen compounds were positively identified by GCMS analysis. These compounds represent three compound types which are pyridine, pyrrole and amide.



Item Type:Thesis (Masters)
Date:May 1987
Date Type:Completion
Subjects:Chemistry
Divisions:College Of Sciences > Chemistry Dept
Creators:Ali, Mohammed Ashraf
Committee Advisor:Ali, A. F. M. Abdul
Committee Members:Perzanowski, Herman and Bukhari, Ahmed
ID Code:9709
Deposited By:KFUPM ePrints Admin
Deposited On:22 Jun 2008 16:47
Last Modified:25 Apr 2011 09:23

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