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Flame Inhibition by Ferrocene, Carbon Dioxide, and Trifluoromethane Blends: Synergistic and Antagonistic Effects.


pdf icon Flame Inhibition by Ferrocene, Carbon Dioxide, and Trifluoromethane Blends: Synergistic and Antagonistic Effects. (125 K)
Linteris, G. T.; Rumminger, M. D.

NISTIR 6359; 5 p. October 1999.

Chemical and Physical Processes in Combustion. Combustion Institute/Eastern States Section. Proceedings. October 11-13, 1999, Raleigh, NC, 1999.

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Order number: PB2000-100883

Keywords:

chemical inhibition; ferrocene; flame chemistry; halons; iron pentacarbonyl

Abstract:

The production of CF3Br has been banned. As a flame inhibitor, iron pentacarbonyl (Fe(CO)5) is about two orders of magnitude more efficient than CF3Br, but it is flammable and highly toxic, and its addition to premixed flames at mole fractions above a few hundred ppm does not further reduce the burning velocity. Tf other iron compounds can be identified which show the same strong inhibition but are less toxic and don't lose their effectiveness, they may find use in fire suppressants. Ferrocene (Fe(C5H5)2 or Fee) modifies the sooting tendency of flames, is added to materials as a flame retardant and is an antiknock agent. It is far less toxic than Fe(CO)5, and it may produce the same iron-containing intermediates. Here, we present the first measurements of flame inhibition by ferrocene, compare it with Fe(C0)5 and CF3Br, and present data showing how combining it with other compounds can overcome the loss in effectiveness experienced by both it and Fe(CO)5.