Optimization of the ammonia oxidation process used in the manufacture of nitric acid

Uronen, P.; Kiukaanniemi, E.

doi:10.1007/3-540-06583-0_35

Cited by 1 publication

(3 citation statements)

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“…[6] There are several chemical reactions occurred in parallel with the formation of NO. Table (1) describes the rates of these chemical reactions. The most dominant reactions is described in equations 19, 20.…”

Section: Kinetics Of Ammonia Oxidationmentioning

confidence: 99%

“…Catalytic oxidation of ammonia is commercially one of the most important reactions in heterogeneous catalysis. Uronen [1] has shown that the overall oxidation rate is controlled by the transfer of NH 3 from the bulk gas phase to the platinum surface. [1] 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.…”

Section: Introductionmentioning

confidence: 99%

“…Uronen [1] has shown that the overall oxidation rate is controlled by the transfer of NH 3 from the bulk gas phase to the platinum surface. [1] 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 NO yield was examined.…”

Section: Introductionmentioning

confidence: 99%

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Modelling and Simulation of Gauze Reactor of Ammonia Oxidation

Salam¹

2016

AJCHE

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Modelling of catalytic ammonia oxidation reactor for nitric oxide production in nitric acid plant over gauzes of Pt/Rh catalyst was the subject of current study. Viscosity, mass transfer and kinetic equations were used for the gas mixture feeding the reactor, partial pressure and mole fraction of ammonia was essential, also wire diameter was considered to detect platinum losses during oxidation operation. In order to investigate the performance of catalytic oxidation reactor, ordinary equation for determining of conversion yields of ammonia to nitric oxide was solved in mathematical model numerically. Variations of conversion with inlet mixture temperature, mixture concentration, inlet pressure and gauze temperature during cycle were investigated. Platinum losses rate as platinum oxide (PtO 2 ) was studied with gauzes surface temperature by using numerical solution of the mathematical model. Modelling results were compared with an industrial reactor data. Comparing industrial data for all studied variables with those obtained by using mathematical model have shown the higher degree of accuracy of the model to predict the operating values with minimum deviation.

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Section: Kinetics Of Ammonia Oxidationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%