Low Concentrations Of Methane Liquid Phase Catalytic Oxidation Reaction

Recently, underground drainage is the mainly method of the exploitation of CBM-coal bed methane in china. The low concentration of methane is due to the air mixture during the exploitation. The no-utilized CBM were emitted to the atmosphere directly, which wasted the recourses and polluted the air. In this paper part oxidation of 30% methane CBM were studied in order to find a utilization path.In this paper, according to the basic study of liquid phase part oxidation of methane, a series of the catalyst such as sulfate, transition metal compound and iodine were chose. Then, the parameters of iodine catalyst and the V2O5 were mainly studied. And when the optimized processes over iodine catalyst were:catalyst concentration 0.05, temperature 180, and pressure 4Mpa, reaction time 2h. The conversion of methane was 85.26%. The selective of the target product was 87.35%. The optimized processes over V2O5 catalyst were:catalyst concentration 0.3mol·L-1,temperature 180℃, pressure 4Mpa, reaction time 2h. The conversion of methane was 61.73%, the selective of the target product was84.69%.According to the Gaussian 03, the thermodynamics of part oxidation of the low concentration of methane was calculated, the result showed that CH4, SO3 and H2SO4 to CH3OSO3H was the mainly transfer path of methane in the CBM. The mechanism of liquid phase part oxidation of methane was discussed and the electrophonic alternative mechanism was proposed. And the circulation process was analyzed. According to the analysis of potential surface by Gaussian 03, it was found that oxidation process was the controlling process.