Absorption of NO by NaClO2 solution: Performance characteristics

The absorption of lean NO (200 similar to 1000 ppm) gases in aqueous NaClO2 solution was investigated in both a mechanically stirred vessel and a pack ed tower. The chemical reaction rate btween NO and NaClO2 in alkaline solut ion was shown to be second-order with respect to NO concentration and first -order to NaClO2 concentration. After including mass transfer consideration s, the absorption rate equation established in this work (under the conditi on of NaClO2 concentration less than 1.0 M and temperature at 30 degrees C) is given as: R-A = P-A (682 x 10(5) + 1/2.97 x 10(-2) {[NO](i)[NaClO2](0)}(1/2))(-1) (mo les/sec cm(3)) In addition, a robust design method was also used to study the performance of this de NOx process by NaClO2 solution in a packed tower. SIN analysis o f the results indicated that the pH of liquor, NaClO2 concentration and NaO H concentration were the major factors in affecting both NO oxidation and a bsorption efficiencies.