The Effect of Organic Sulfur Compounds on Oxidation Processes of Hydrocarbon Fuels

Bol'shakov, G. F.

doi:10.1080/01961778708082511

Cited by 11 publications

(13 citation statements)

References 1 publication

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“…However, in cases where surface fouling has been measured, the thermal stability of the resultant blends is not improved over that of the hydrotreated fuel, 8,9 because natural antioxidants which are the basis of slowed oxidation of the straight-run fuels may also be the source of insoluble formation. 25 However, with respect to the slower oxidizing fuels, dilution with hydrotreated fuels also tends to produce slower oxidizing blends. In these instances, blending could be considered a means of reducing pro-oxidants, antioxidants, and aromatics in the lesser quality fuels and, thereby, improving thermal stability.…”

Section: Resultsmentioning

confidence: 99%

Autoxidation of Neat and Blended Aviation Fuels

Jones

Balster

1998

Energy Fuels

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The liquid-phase oxidation of eight fuels and a series of 1:1 blends has been studied at elevated temperature and pressure to simulate some of the chemical-reaction conditions that cause surface fouling in aircraft fuel lines. The time, t, needed to deplete dissolved O 2 by 50% was determined for each blend and component fuel. No simple relationship was found, i.e., linking t for blends and component fuels, attesting to the complexity of aviation-fuel autoxidation. About one-half of the blends oxidize with t being intermediate between the two components. However, many blends between fuels of low thermal stability and fuels which have been severely hydrotreated are found to exhibit unusually slow oxidation, with t being greater than that measured for either component. This phenomenon is not well understood; possible explanations focus on synergistic effects among natural antioxidants, dissolved metals, and aromatics in the blends. Measurements of surface fouling in blends selected for their unusually slow oxidation indicate that thermal stability of fuels can be improved by blending with a paraffinic/cycloparaffinic solvent. Improvements in thermal stability of 1:1 blends are comparable to those achieved by introducing conventional fuel additives.

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Section: Resultsmentioning

confidence: 99%

Autoxidation of Neat and Blended Aviation Fuels

Jones

Balster

1998

Energy Fuels

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“…A simplified mechanism for autoxidation includes initiation (reactions 1 and 2), propagation (reactions 3 and 4), and termination (reaction 5) On the basis of observed inhibited autoxidation and the correlation between deposition and autoxidation of POSF-2827 fuel 4 as well as reported , ties between S-containing inhibitors and insolubles, reaction 6 has been introduced 5 as a first step leading to insolubles in the neat fuel An excess of S-containing natural inhibitors, R‘S, is available in POSF-2827 fuel to limit [ROOH].…”

Section: Resultsmentioning

confidence: 99%

Thermal Stability of Jet-Fuel/Paraffin Blends

1996

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The thermooxidative stability of blends of a straight-run Jet-A fuel (POSF-2827) and a paraffinic/cycloparaffinic solvent (Exxsol D-80) has been studied in a single-pass tubular heat exchanger operated isothermally at 185 °C. Autoxidation of most blends is found to be significantly slower than that of either fuel or solvent. Surface fouling relative to the solvent is increased by addition of jet fuel; this is attributed to reactions of natural antioxidants present in the fuel. Surface fouling relative to the jet fuel is reduced following paraffin addition under conditions of partial O2 conversion; this is attributed to a lower initiation rate as the concentration of aromatics is reduced. The impact of these findings for mitigation of surface fouling in aircraft fuel lines is discussed.

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“…Insoluble oxidation products are formed that appear as gums and sediments. The formation of gums and sediments are more when oxidizing oil sands-derived bitumen compared with lighter oil fractions (Bolshakov 2007). The parameters that affect lowtemperature oxidation of heavy oil and some of the changes that accompany autoxidation have been reported in literature (Moschopedis and Speight 1975;Noureldin et al 1987;Xu et al 2001;Jia et al 2005;Javadli and De Klerk 2012).…”

Section: Autoxidationmentioning

confidence: 96%

Desulfurization of heavy oil

2012

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Strategies for heavy oil desulfurization were evaluated by reviewing desulfurization literature and critically assessing the viability of the various methods for heavy oil. The desulfurization methods including variations thereon that are discussed include hydrodesulfurization, extractive desulfurization, oxidative desulfurization, biodesulfurization and desulfurization through alkylation, chlorinolysis, and by using supercritical water. Few of these methods are viable and/or efficient for the desulfurization of heavy oil. This is mainly due to the properties of the heavy oil, such as high sulfur content, high viscosity, high boiling point, and refractory nature of the sulfur compounds. The approach with the best chance of leading to a breakthrough in desulfurization of heavy oil is autoxidation followed by thermal decomposition of the oxidized heavy oil. There is also scope for synergistically employing autoxidation in combination with biodesulfurization and hydrodesulfurization.

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The Effect of Organic Sulfur Compounds on Oxidation Processes of Hydrocarbon Fuels

Cited by 11 publications

References 1 publication

Autoxidation of Neat and Blended Aviation Fuels

Autoxidation of Neat and Blended Aviation Fuels

Thermal Stability of Jet-Fuel/Paraffin Blends

Desulfurization of heavy oil

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