Methyl iodide, combustion

The halogen compounds used were methylene dichloride, chloroform, carbon tetrachloride, ethylene dichloride, ethyl bromide, ethylene dibromide, bromoform, methyl iodide, and ethyl iodide. The hydrocarbons selected for their interesting combustion properties were hexane, 2-methylpentane, 2,2-dimethylbutane, hex-l-ene, heptane, methylcyclo-hexane, isooctane, diisobutylene, benzene, toluene, m-xylene, and ethylbenzene. 

Further, the effectiveness of a halogen compound was not entirely caused by its halogen content. For example, ethyl iodide promoted combustion more than methyl iodide, and chloroform more than carbon tetrachloride. 

CH3I (g). Thomsen15 and Berthelot1 1 measured the beat of combustion of gaseous methyl iodide. 

Thomas JK (1967) Pulse radiolysis of aqueous solutions of methyl iodide and methyl bromide. The reactions of iodine atoms and methyl radicals in water. J Phys Chem 71 1919-1925 Tsang W, Hampson RF (1986) Chemical kinetic data base for combustion chemistry, part I. Methane and related compounds. J Phys Chem Ref Data 15 1086-1279 UlanskiP, von Sonntag C (1999) The OFI-radical-induced chain reactions of methanol with hydrogen peroxide and with peroxodisulfate. J Chem Soc Perkin Trans 2 165-168 Ulanski P, Bothe E, Hildenbrand K, von Sonntag C, Rosiak JM (1997) The influence of repulsive electrostatic forces on the lifetimes of polyfacrylic acid) radicals in aqueous solution. Nukleonika 42 425-436... 

If RX is methyl iodide, bromide, or chloride, it may cool the flame and, consequently, reduce combustion. Further, the phosphine can be oxidized readily to the phosphine oxide. The latter reaction may lead to self-extinguishing properties either by absorption of energy to complete the reaction and/or more likely by formation of the polyphosphates and the subsequent shielding of the polymer by this thermally stable glass (19). 

Thomsen 523 determined the heat of combustion of gaseous methyl iodide, from which can be deduced A/7 (CH3l g)25°c -4 9 kcal mole b (Small differences of two- or three-tenths of a kilocalorie in these values from those quoted elsewhere are due to the use here of the most modern subsidiary thermal data.) For some reason this result has not been looked on with much favour, and two recent thermochemical researches have been carried out a main result of which is essentially the determination of the heat of formation of methyl iodide, though it is expressed as the G -1 l >ond energy 3 3 5, 368 In two other recent researches, the heat of formation of methyl iodide has been in the one the main object, and in the other an important incidental result Moreover, direct... 

HYDRAZINE-BENZENE (100-63-0) A highly reactive reducing agent. Combustible solid (flash point 190°F/88°C). Dust or powder forms explosive mixture with air. Reacts violently with oxidizers calcium hypochlorite, fluorine, hydrogen peroxide, perchlorates, methyl iodide,... 

Methyl iodide is mixed with an excess of combustible solvent and burned in a chemical incinerator equipped with an afterburner and scrubber. Small amounts may be destroyed in the laboratory by hydrolyzing with an aqueous or ethanolic solution of caustic potash. The reaction is... 

Atmospheric halogen compounds (Penkett, 1982) are of both natural and industrial origin. Probably the most abundant halocarbon in the troposphere is methyl chloride, CH3CI, which is present at a level of 0.6-2 parts in 10 . It appears to be present in volcanic emissions, formed by microbial fermentation, by the combustion of vegetation (Lovelock, 1975), and by the SN2 reaction of methyl iodide (a constituent of marine algae) with the large excess of chloride ion in seawater (Zafiriou,... 

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