Stabilization of blended diesel fuels by combinations of antioxidants and metal deactivators

Голубева, И. А.; Klinaeva, E. V.; Yakovlev, V. S.

doi:10.1007/bf00723938

Cited by 5 publications

(2 citation statements)

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“…However, in the absence of any catalytic metals, the effects that soluble chelants might exert are (1) as an antioxidant and (2) as a surface-active agent. 15 While there is no strong evidence to support a mechanism by which the disalicylidene chelant can function as an effective antioxidant, positive synergistic effects in blended diesel fuels have been reported 29 between metal-deactivator additives and hindered phenol antioxidants. As discussed above, the ability of a soluble metal chelant to function as an effective surface-active agent would be highly dependent on the conditions of a particular thermal stability test.…”

Section: Discussionmentioning

confidence: 99%

Significance of Copper Complex Thermal Stability in the Use of Metal Deactivators at Elevated Temperatures

Morris

Hasan

et al. 1998

Energy Fuels

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A series of compounds were examined to determine which structural aspects were necessary to effectively block the catalytic activity of soluble copper that promotes thermal deposition from jet fuel during JFTOT testing. The results indicated that salicylidene compounds such as that currently used as a metal-deactivating additive are the most effective, with the copper coordinated with both the nitrogen and oxygen atoms. The significance of the thermal stability of the copper complex of the metal-deactivator additive was revealed through thermal-desorption mass spectrometry and XPS examination of copper-rich JFTOT tube deposits generated at high temperatures. Through JFTOT testing with heater tubes constructed from a variety of alloys, the impact of alloy composition on thermal deposition from jet fuel was demonstrated. These findings were used to construct a hypothesis that is consistent with the appearance of MDA induction periods in accelerated turbulent flow fuel tests.

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Section: Discussionmentioning

confidence: 99%

Significance of Copper Complex Thermal Stability in the Use of Metal Deactivators at Elevated Temperatures

Morris

Hasan

et al. 1998

Energy Fuels

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“…The behavior of MDA+BHT is approximately equal to the average of the individual additive effects in improving thermal stability for short times, but the benefits disappear at higher conversion. This combination of antioxidant and MDA has been reported to improve long-term storage stability in Cu-containing diesel fuels (Golubeva et al, 1994), and it has recently been postulated that MDA is effective only when introduced at the refinery, i.e., prior to Cu exposure (Pande and Hardy, 1995). The impact of the dispersant is greater than that of the antioxidant and MDA.…”

Section: Antioxidant and Dispersant Used In Combination With Mdamentioning

confidence: 99%

Evaluation of the Effectiveness of a Metal Deactivator and Other Additives in Reducing Insolubles in Aviation Fuels

Jones

Balster

1996

Volume 3: Coal, Biomass and Alternative Fuels; Combustion and Fuels; Oil and Gas Applications; Cycle Innovations

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Surface fouling in aircraft fuel lines resulting from autoxidation of aviation fuel leads to reduced efficiency as deposits collect on heat exchangers, nozzles, and servocontrols and may ultimately lead to system failure. Metal surfaces and trace quantities of metals dissolved in the fuel exacerbate the surface-fouling problem because they can catalyze free-radical initiation, thereby accelerating autoxidation. Additives and additive packages containing antioxidants, dispersants, and metal deactivators (MDA) have been shown to reduce insolubles in some fuels. Because of metal chelation and possible metal-surface passivation, MDA has been proposed as an additive component to be included in all fuels, even those without dissolved metals. The goal of the present study was to obtain fundamental information on the behavior of MDA under conditions where surface-passivation effects are minimal. Experiments have been conducted to 1) study the effects of adding MDA to fuels containing a significant concentration of dissolved metals (i.e., chelation) and to those containing minor concentrations of dissolved metals and 2) investigate interactions when MDA is used in conjunction with an antioxidant and a dispersant. Simple fuel-line-fouling simulations with a single-pass tubular heat exchanger operated under near-isothermal conditions have been conducted to study the thermal behavior at 185°C of several neat and MDA-treated jet fuels as well as fuels treated with MDA plus other additives. Comparison of neat and treated fuels is based on several criteria: 1) dependence of autoxidation on stress duration, 2) dependence of surface deposition on stress duration, and 3) quantity of total insolubles (bulk filterables and surface deposits). Potential advantages and disadvantages of using MDA alone and in combination are discussed.

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Synergistic effect of metal deactivator and antioxidant on oxidation stability of metal contaminated Jatropha biodiesel

Sarin

Arora

Singh

et al. 2010

Energy

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Stabilization of blended diesel fuels by combinations of antioxidants and metal deactivators

Cited by 5 publications

References 0 publications

Significance of Copper Complex Thermal Stability in the Use of Metal Deactivators at Elevated Temperatures

Significance of Copper Complex Thermal Stability in the Use of Metal Deactivators at Elevated Temperatures

Evaluation of the Effectiveness of a Metal Deactivator and Other Additives in Reducing Insolubles in Aviation Fuels

Synergistic effect of metal deactivator and antioxidant on oxidation stability of metal contaminated Jatropha biodiesel

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