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Chemical aspects of thermal instability in jet fuels from Saudi Arabian crude oils

Nizami, Alam (1993) Chemical aspects of thermal instability in jet fuels from Saudi Arabian crude oils. Masters thesis, King Fahd University of Petroleum and Minerals.

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Accelerated and ambient storage stability tests were conducted using model nitrogen compounds in petroleum derived jet-A fuel and n-decane, indicating that the rate of sediment formation was dependent on the structural features of nitrogen compounds, the nature of diluent employed and storage conditions. Air, increased temperature, dissolved oxygen and light all strongly accelerate the sediment formation rate but the removal of dissolved oxygen from the base fuel (jet A fuel and n-decane) significantly reduced the rate. Carboxylic acids act as an accelerator while phenols inhibitor toward sediment formation with nitrogen containing compounds. The reaction has a low apparent activation energy and appears to involve a free radical oxidative self condensation of nitrogen compunds. Characterization of sediment was made by elemental analysis, infrared and mass spectroscopy. The lower O/C ratios of sediment proved that the oxidation is a key aspect of jet fuel thermal instability. Approximately 25 different types of possible compounds were identified from average properties of 2,5-dimethylpyrrole sediments. Nuclear magnetic resonance spectroscopies were applied to the characterization of average molecular structureal parameters of various fuel samples containing varying amounts of parrafinic and aromatic constituents with the help of computer programming.



Item Type:Thesis (Masters)
Date:May 1993
Date Type:Completion
Subjects:Chemistry
Divisions:College Of Sciences > Chemistry Dept
Creators:Nizami, Alam
Committee Advisor:Ali, A. F. M. Abdul
Committee Members:Hamdan, Abdullah J. and Lyle, Samuel J.
ID Code:10247
Deposited By:KFUPM ePrints Admin
Deposited On:22 Jun 2008 17:00
Last Modified:26 Apr 2011 07:59

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