الفهرس 
Introduction of Nitric AcidOnly 14 pages are availabe for public view
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Abstract
Reactors containing a catalyst in the form of a gauze are applied to the production of nitrogen oxides during the production of nitric acid (the Ostwald process). In dependence on the catalyst used and on the process conditions (temperature, pressure, gas phase composition). The total pressure during the combustion of NH3 is the most important technological parameter of industrial oxidation of ammonia. Normally, the working temperature in the catalyst bed is about 890 oC, and increases with increasing pressure. The behavior of an industrial reactor for the oxidation of ammonia with Pt–Rh gauzes was simulated by means of a mathematical model accounting for the axial dispersion of the components, the effect of temperature on the physico-chemical properties of the reacting mixture. The effect of the preheating temperature, the input mixture composition, pressure and reactor load on the temperature distribution in the catalyst bed and on the NO yield was examined. The calculated NO yields agree well with the values actually attained in industrial reactors. The effect of the reaction mixture composition and total pressure on the yield is also consistent with observed dependences.