Methane Liquid Phase Catalytic Oxidation Of Methanol Process

The partial oxidation of methane in liquid is one of the most important approaches to conversion of methanol with high value. In this thesis, the current researching and significance of catalytic partial oxidation of methane to methanol at home and abroad was reviewed. And the literature indicated that the development of novel catalysts is the key of the study. At present, although the iodine as a catalyst, oleum as the solvent liquid phase partial oxidation of methane research is not adequate, but the reaction has higher yield and the conversion rate of the industrialized good prospects to enlarge production.The feasibility catalysis mechanisms was discussed for searching the essential of methane partial oxidation and the electrophilic alternative mechanism proposed has been accepted for I₂ catalysts in oleum. Those catalysts belonged to oxidation-reduction type and they showed similar catalysis for oxidation of methane if the catalystion has a suitable oxidation-reduction potential value. The lumped kinetic model of methane oxidation was developed and first-order based on the pressure-time relationship was determined. The value of activation energy was determined to be 9.54 kJ·K-1·mol-1 for I₂.Given the iodine as a catalyst, oleum as the solvent of the partial oxidation of methane good prospects for the industrialization, the process of continuous catalytic partial oxidation of methane in liquid to methanol are studied in the bubble column reactor as the main reactor. Firstly, the effect of the gas flow rate, pressure, temperature and liquid flow rate on the partial oxidation of methane were discussed.in the bubble column.The experimental results show that: The process of methane partial oxidation to methanol by Iodine catalyst in oleum for the optimum conditions are as follows: I₂ catalyst for the addition of 0.099 mol·L-1, a solvent for 50%(wt) oleum, the reaction temperature is 453 K, pressure is 2.0 MPa, gas flow is 400 ml / min, liquid flow is 6 ml / min, the highest response rate of conversion of one-way about 45 percent; Secondly, the process of methane liquid continuous catalytic oxidation to methanol containing liquid-gas feed system and the preheater devices, liquid methane oxidation reactor, the reaction from exhaust cooling devices, vapor-liquid equilibrium separation devices, liquid separation device reaction products, liquid products of hydrolysis installation were designed and studied. The experimental results show that: this process not only can recycle the raw materials and the reaction catalyst, but also obtain the higher concentration of methanol; this processes is more perfect. Finally, the cycle of solvent use and intermediate products of hydrolysis problem were discussed.