Masalitina N. Technology of nitrogen(I) oxide by ammonia oxidation

The thesis is devoted to development of technology of catalytic ammonia oxidation to nitrogen(I) oxide. The process of low-temperature oxidation of ammonium on oxidizing catalysts has been investigated for production of nitrogen(I) oxide to be used for medical purposes and organic synthesis. Сerium-containing catalysts under various technological parameters were investigated. The presence of the cerium oxide component in the catalyst is necessary because it prevents catalyst particles from aggregation and improves their stability. A mathematical model of the oxidation process of NH3, considering the physical and chemical properties of the ammonia-air mixture and nitrous gas, was developed; the rate constants and their temperature dependence were determined. This allows deter-mining the optimal process conditions of NH3 oxidation on the oxide catalyst at different pressures in a wide range of changing process parameters. On the basis of the developed model a program for computation the NH3 oxidation reactor using the oxide catalyst was designed. During the operation process the volume and the surface of the catalyst are changed. That is why a mathematical model referring the rates of ammonia oxidation steps to a mass unit of the oxide catalyst has been derived in the research. Experimentally validated concepts became the basis for creation the technological process of ammonia oxidation in the rising stream of catalyst. Technological scheme of nitrogen(I) oxide production for organic synthesis was developed. The developed technological process is proposed for industrial implementation and appropriate output data are provided for industrial design.