METHOD OF PURIFYING NITROGEN OXIDE AND SULFUR DIOXIDE- CONTAINING GAS FROM NITROGEN OXIDE Russian patent published in 1997 - IPC

FIELD: gas purification. SUBSTANCE: invention relates to purification of furnace gases from sulfur-containing fuel or garbage burner heat stations. Furnace gas is treated with alkali metal bicarbonate in presence of oxygen at molar oxygen to carbon monoxide ratio at least 1 and sulfur dioxide to nitrogen monoxide ratio more than 0.2 and at gas temperature 300-700 C. Preferably, such SO₂ amount is used which is theoretically required to form such alkali metal pyrosulfite (from corresponding bicarbonate) amount that is sufficient to full consumption of NO and NO₂. Molar ratio MHCO₃/NO is 0.5. Dry gas treatment with sodium bicarbonate is of preference. EFFECT: increased purification degree. 5 cl, 5 dwg