ABSORPTION OF NO BY NaClO₂ SOLUTION: PERFORMANCE CHARACTERISTICS

Abstract

Abstract 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: $ 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.