AN EVALUATION OF THE KINETIC-PARAMETERS FOR THE REACTION OF TRIFLUOROMETHYL RADICALS WITH CH3CL IN THE GAS-PHASE IN THE TEMPERATURE-RANGE FROM 416 TO 636-K

The hydrogen and chlorine atom abstraction reactions from CH3Cl by CF3 radicals produced by the photolysis of hexafluoroacetone (HFA) and CF3I were studied relative to the recombination of CF3 radicals: [GRAPHICS] The Arrhenius parameters obtained in the temperature range 416 to 578 K are: Log k3/k2(1/2)[cm3/2 mol-1/2 s-1/2] = (5.39 + 0.10) - (10490 + 150)/theta Log k4/k2(1/2)[cm3/2 mol-1/2 s-1/2] = (4.52 + 0.11) - (13370 + 250)/theta where theta = 2,303.RT cal mol-1 and k2 is the recombination rate constant for the CF3 radicals. The factors that influence the transfer processes of chlorine and hydrogen are analyzed in a series of reactions of halomethanes with CF3 and CH3 radicals.