Flammability heterogeneous mixtures

Heterogeneous Mixtures (Zabetakis, Flammability Characteristics of Combustible Gases and Vapors, Bulletin 627, Bureau of Mines, 1965.) Heterogeneous (poorly mixed) gas phase mixtures can lead to fires that normally would be totally unexpec ted. It is important... 

Charge the addition funnel with triethyl phosphite (8.8 mL, 9.4 g, 57 mmol) and add it in small portions to the stirred light yellow heterogeneous mixture of nickel(ll) chloride and iodobenzene at 160°C. Upon the addition the mixture darkens in colour. After an induction period of about 1 min an exothermic reaction begins and ethyl iodide is evolved and collected in the receiver and the reaction mixture fades to light yellow. Caution exothermic reaction Caution ethyl iodide (b.p. 72°C) is flammable, toxic, an irritant and a sensitizer. 

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