High temperature oxidation of C 2Cl 4/CH 4 mixtures

Abstract

Experiments on high temperature oxidation of multi-chlorinated hydrocarbons, tetrachloroethylene (C 2Cl 4), with hydrocarbon fuels, CH 4, were performed in a 15 mm i.d. tubular flow reactor. Temperatures ranged from 700 to 850 °C, with the average residence time in the range from 0.3 to 1.5 s. Three equivalence ratios, φ=0.87 (fuel-lean (FL)), φ=1 (stoichiometry (S)), and φ=1.3 (fuel-rich (FR)), were studied. The global Arrhenius equations for the decomposition of C 2Cl 4 for each reactant set ratio are: k lean =5.77×10 15 exp(−30447/RT) , k stoi =5.15×10 15 exp(−30421/RT) , and k rich =6.32×10 14 exp(−28879/RT) . The important reactions for destruction of parent C 2Cl 4 include: C 2Cl 4→C 2Cl 3+Cl, C 2Cl 4+H→C 2Cl 3+HCl and C 2Cl 4+H→C 2HCl 3+Cl. The resulting reactant loss, and intermediate and final product profiles were determined. C 2HCl 3, C 2Cl 2, CO, CO 2 and HCl are the major products for the reaction of C 2Cl 4/CH 4/O 2 mixtures for these three reaction systems. Minor intermediates include C 2H 3Cl, C 2HCl, COCl 2, CH 3CHCl 2, C 2H 4, C 2H 6, CCl 2CHCH 3, trans-CHClCHCl, cis-CHClCHCl, trans-ClHCCClCH 3, C 6H 6, and Cl 2. The experimental data showed that as the oxygen concentration increased, the temperature needed to detect the resulting products decreased.