ABSORPTION OF NO BY NaClO2 SOLUTION: PERFORMANCE CHARACTERISTICS

The absorption of lean NO (200 ∼ 1000 ppm) gases in aqueous NaClO₂ solution was investigated in both a mechanically stirred vessel and a packed tower. The chemical reaction rate between NO and NaClO₂ in alkaline solution was shown to be second-order with respect to NO concentration and first-order to NaClO₂ concentration. After including mass transfer considerations, the absorption rate equation established in this work (under the condition of NaClO₂ concentration less than 1.0 M and temperature at 30°C) is given as:

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In addition, a robust design method was also used to study the performance of this de NO_x process by NaClO₂ solution in a packed tower. S/N analysis of the results indicated that the pH of liquor, NaClO₂ concentration and NaOH concentration were the major factors in affecting both NO oxidation and absorption efficiencies.