Nonflammable mixture

It is found experimentally that limit mixtures, incapable of supporting combustion waves, nevertheless have theoretical thermodynamic flame temperatures of the order of 1000° C. or more. It is, therefore, not immediately clear why combustion waves, albeit slowly propagating, should not develop in mixtures possessing such substantial chemical enthalpy. The question arises whether the observed limits of flammability are true limits or whether such mixtures are actually capable of supporting combustion waves but are prevented from doing so by experimental limitations. Experimentalists believe that the limits are true. On the other hand, no theoretical criterion for the limit is obtained from the steady-state equations of the combustion wave. That is, the equations describe combustion waves without differentiating between mixtures that are known to be flammable and mixtures that are known to be nonflammable. Therefore, for nonflammable mixtures the combustion wave becomes unstable to perturbations and thus disappears (7). Conversely, for flammable mixtures the combustion wave can overcome perturbations—i.e., it returns to the steady state after being perturbed. 

Evolves nonflammable mixture of phosphine, ammonia and carbon dioxide... 

Fig. 4.40. 107-nm Pt/CeOx model catalysts prepared by colloidal lithography both before and after a H2 oxidation reaction (Ph2/(Ph2 + P02) = 0.67) at 973K for 2h (nonflammable mixture in Ar)... 

SPILL CLEAN UP use water spray to cool and disperse vapors dilute spills to form nonflammable mixtures control runoff and isolate discharged material for proper disposal eliminate all ignition sources. 

SPILL CLEAN-UP ventilate area of leak or spill use water spray to cool and reduce vapors, and dilute spills to form nonflammable mixtures collect liquid in an appropriate container or absorb with noncombustible materials (e.g., sand, clay, dry earth), and place in a chemical waste container flush remaining liquid with large amounts of water but not into confined spaces such as sewers because of danger of explosion remove all sources of ignition. 

SPILL CLEAN-UP absorb as much as possible in noncombustible materials such as dry earth, sand, or vermiculite flush remaining ethanolamine with large amounts of water and dilute to form nonflammable mixtures. 

SPILL CLEAN-UP use water spray to cool and disperse vapors dilute spills to form nonflammable mixtures absorb small quantities of liquid on paper towels and evaporate in a fume hood absorb large quantities of liquid in noncombustible material and atomize in a suitable combustion chamber equipped with effluent gas cleaning device allow solid form to melt and properly dispose of liquid. 

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