Abstract
The experiments were performed in a countercurrent packed column in a continuous mode to study the absorption of nitric oxide in sodium chlorite/urea solutions. Sodium chlorite mainly works as an agent to oxidize NO to NO 2. A combined SO 2/NO removal system was also tested. On the basis of high SO 2 removal efficiency, the NO removal efficiencies under various experimental conditions were emphatically measured. Among the operating variables such as initial NaClO 2 concentration, urea concentration, temperature and initial pH value, the pH value of the absorbing liquid was found to have a great impact on both NO removal efficiency and NO 2 concentration. NO removal efficiency was increased with increasing NaClO 2 concentration and temperature. Urea almost has no negative effect on NO removal efficiency, however it aids the abatement of NO 2 greatly. The anions in the spent scrubbing liquor were analyzed by ion chromatography.
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