D. Nieweś, M. Kaniewski, D. Popławski, M. Huculak-Mączka, E. Klem-Marciniak, J. Hoffmann, K.Hoffmann
Wroclaw University of Science and Technology, Wrocław, PL

USING ASPEN PLUS SOFTWARE TO OPTIMIZE NITROGEN OXIDES OXIDATION IN THE PROCESS OF NITRIC ACID PRODUCTION


Nitric acid is a chemical compound that is mostly used in the nitrate fertilizers production. Due to an increased demand for nitrogen compounds, which is caused by the growth in the global population, the production of nitric acid is increasing. An important issue in HNO3 production are the gaseous pollutants, which are generated during the process. The main objective of this study was the computer simulation of the oxidation process, where the substrate was a gas mixture formed after ammonia oxidation process. The essence of this process was the oxidation of gaseous mixture comprised of nitrogen oxides and oxygen to other nitrogen oxides. Optimal process parameters to obtain the highest HNO3 concentration were chosen. This allows to get the maximum NOx conversion and minimalized concentration of NOx in a waste gas stream. Analysis of process parameters was based on the computer simulation in Aspen Plus. Molar flow of gaseous oxidation products of ammonia and their temperature were optimized. Obtained results allowed to determine the dependency of the concentration of nitric acid and NOx to HNO3 conversion on optimized parameters.

Keywords: aspen plus, nitrogen oxides, optimization, nitric acid