Ponomarev V. Disposal technology for solutions on the basis of strong nitrate acid

Object of study: the technologies of nitric acid and nitrogen oxides based offgrade solutions containing corrosion inhibitors utilization. Research objective: working out physicochemical basis of offgrade solutions utilization containing corrosion inhibitors. Research Methods and equipment: titrimetric, permanganometric, iodometric, gravimetric methods of analysis, chromatography, photometry, statistical multivariate regression method. Theoretical and practical results: on the basis of thermodynamic and kinetic calculations the expediency of extraction HF, I2 and NO2 by means of air stripping of solutions HNO3 - N2O4 - H2O - HF - H3PO4 and HNO3 - N2O4 - H2O - I2 - HIO3, thermal decomposition of HNO3, nitrogen (IV) oxide reduction by carbamide and carbon-containing ammonium salts, I2 and HF absorption and neutralization of H3PO4, HIO3 calcium-containing compounds is proved. Novelty: theoretically and experimentally established the feasibility of nitric acid and nitrogen oxides based offgrade solutions containing corrosion inhibitors utilization, which is based on the kinetics in solutions of HNO3 - N2O4 - H2O-HF - H3PO4 and HNO3 - N2O4 - H2O - I2 - HIO3. The degree of implementation: The results were given to CJSC "Severodonetsky ORGHIM" PJSC "SEVERODONETSKOE OBJEDINENIE AZOT" and PUC "Ekoantilid" to make design documentation for facility of nitric acid and nitrogen oxides based offgrade solutions containing corrosion inhibitors utilization, as well as implemented in the educational process of students majoring 05130101 - "Chemical technology of inorganic substances" NTU "KhPI". Application area: chemical industry.