METHOD OF THE NON-CONCENTRATED NITRIC ACID PRODUCTION Russian patent published in 2007 - IPC C01B21/40 B01D53/94 

FIELD: chemical industry; methods of production of the non-concentrated nitric acid.

SUBSTANCE: the invention is pertaining to the method of production of the nitric acid and may be used in chemical industry in the power-engineering operational layouts of production of the nitric acid containing the recuperation and high-temperature gas-turbine aggregate with application of the low-temperature catalytic selective purification of the exhaust gases from nitrogen oxides. The method of production of the non-concentrated nitric acid includes production of the nitrogen oxides by ammonia oxidizing, their absorption by the water, the catalytic purification of the exhaust gases after absorption by recovery of the residual nitrogen oxides by ammonia, their heating before feeding into the gaseous turbine by interaction of the methane with the oxygen on the catalytic agent ensuring decomposition of the nitrous oxide till the residual content of 5÷60ppm. As the catalytic agent use the high-temperature manganese -alumina catalytic agent with the contents of the active component - Mn₂О₃ ≥ 10 mass % on the A1₂O₃ carrier at the volumetric speed of the flow of 15000-25000 hour^-1. The oxygen content in the exhaust gases after the absorption is maintained within the range of 2.9-3.5 volumetric %, the volumetric ratio _of СН₄/O₂ at the inlet of the reactor is within the range 0.37 - 0.48. The method ensures the high level of the ecological purity of the exhaust gases, reduces the consumption of the natural gas used for heating up of the purified exhaust gases up to the temperature of no less than 730°С.

EFFECT: the invention ensures the high level of the ecological purity of the exhaust gases, reduction of the consumption of the natural gas used for heating up of the purified exhaust gases up to the temperature of no less than 730°С.

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