Özet:

The process of nitrous oxides desorption from nitric acid solutions (in domestic schemes) was considered. It is shown that in the process of desorption (or stripping), the nitrous oxides are not removed from solutions completely, so, the nitric acid does not satisfy the technical requirements in Ukraine. The research objective was to bring the quality of nitric acid to technological standards by removing (stripping) nitrous oxides from its solutions. To achieve the research objective, the balance in the system of nitrous oxides - nitric acid - water was analyzed. Dependences of the partial pressures of N2O4 and NO2 on their concentrations in the liquid phase, the nitric acid concentration and temperature were investigated and determined. It is shown that the Henry's law is applicable for the nitrous oxides desorption in the purge columns of domestic production schemes of nitric acid. Based on experimental studies, expressions for the Henry coefficients for NO2 and N2O4 were formalized. Values of solubility of NO2 and N2O4 in the liquid phase under equilibrium conditions (and similar), i.e. 58 - 60 wt.% HNO3 at 40 - 70°C were determined. Using the obtained dependences, a new purge column, allowing to desorb (strip) nitrous oxides from nitric acid to technological standards was designed. Author Biographies Олександр Олександрович Литвиненко, National Technical University “Kharkiv Polytechnic Institute” 21 Frunze str., Kharkiv, Ukraine, 61000 Professor assistant Department Automatization of chemistry-technological systems and ecological monitoring

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