Advanced thermally stable jet fuels. Technical progress report, April 1994--June 1994

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Research continued on coal-based, thermally stable, jet fuels. Significant progress has been made on the detection of polycyclic aromatic hydrocarbons present in highly stressed fuels, using high-performance liquid chromatography (HPLC) with diode-array detection. Gas chromatography is not able to detect compounds with {>=}6 fused aromatic rings, but such compounds can be identified using the HPLC method. The concentration of such compounds is low in comparison to aromatics of 1-3 rings, but the role of the large compounds in the formation of solid deposits may be crucial in determining the thermal stability of a fuel. The unusual properties of fluid fuels ... continued below

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103 p.

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Schobert, H.H.; Eser, S. & Song, C. July 1, 1994.

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Description

Research continued on coal-based, thermally stable, jet fuels. Significant progress has been made on the detection of polycyclic aromatic hydrocarbons present in highly stressed fuels, using high-performance liquid chromatography (HPLC) with diode-array detection. Gas chromatography is not able to detect compounds with {>=}6 fused aromatic rings, but such compounds can be identified using the HPLC method. The concentration of such compounds is low in comparison to aromatics of 1-3 rings, but the role of the large compounds in the formation of solid deposits may be crucial in determining the thermal stability of a fuel. The unusual properties of fluid fuels in the near-critical region appear to have significant effects on their thermal decomposition reactions. This issue has been investigated in the present reporting period using n-tetradecane as a model compound for fuel decomposition. Temperature-programmed retention indices are very useful for gas chromatographic and gas chromatography/mass spectrometric analysis of coal and petroleum derived jet fuels. We have demonstrated this in the identification of components in two JP-8 fuels and their liquid chromatographic fractions. The role of activated carbon surfaces as catalysts in the thermal stressing of jet fuel was investigated using n-dodecane and n-octane as model compounds. In some cases the reactions were spiked with addition of 5% decalin to test the ability of the carbon to catalyze the transformation of decalin to naphthalene. We have previously shown that benzyl alcohol and 1,4-benzenedimethanol are effective stabilizers at temperatures {>=}400{degrees}C for jet fuels and the model compound dodecane. The addition of ethanol to hydrocarbon/benzyl alcohol mixtures has a significant effect on the thermal stabilization of jet fuels above 400{degrees}C. Ethanol appears to function by reducing the benzaldehyde formed during the degradation of the benzyl alcohol. This reduction regenerates the benzyl alcohol.

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103 p.

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OSTI as DE95015516

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  • Other Information: PBD: Jul 1994

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  • Other: DE95015516
  • Report No.: DOE/PC/92104--T10
  • Grant Number: FG22-92PC92104
  • DOI: 10.2172/86902 | External Link
  • Office of Scientific & Technical Information Report Number: 86902
  • Archival Resource Key: ark:/67531/metadc794768

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  • July 1, 1994

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  • Dec. 19, 2015, 7:14 p.m.

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  • Jan. 4, 2016, 11:30 a.m.

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Schobert, H.H.; Eser, S. & Song, C. Advanced thermally stable jet fuels. Technical progress report, April 1994--June 1994, report, July 1, 1994; United States. (digital.library.unt.edu/ark:/67531/metadc794768/: accessed October 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.