| OCR Text |
Show (;"'~"" Based on the results reported above, a certain amount of NO may break through in NaCl02 scrubbing when O.OOlM NaOH is present. It was presumed that NaOH may inhibit the reaction, or may lower the mass transfer coefficient of this process. In order to test this hypothesis, a number of experiments were performed with 2,000 ppm NO and scrubbing solution containing: NaCl02 : 0.00008, 0.0008, 0.008, 0.08 M Na2co3: 0.000015, 0.00015, 0.0015 and 0.015 M Na2So4 : 0.0000038, 0.000038, 0.00038 and 0.0038 M NaOH: 0.0001, 0.001, 0.005, 0.01, 0.1, 1 M Volume: 1 liter Figure 5 indicates that high concentrations of NaOH do indeed inhibit NO absorption in NaCl02 aqueous scrubbing. Figure 5. pH Effect on NO Absorption in NaCl02 caustic Aqueous Scrubbing ,... le9i if :i ~ 99~ :::. MaCI02 : 9,99S ..... .0 MaCI02 : 9,9S \ ..., \ \ I \. \ S91 \ \ \ 'II 791 "-" t.t 1'1 6Q~ , )I I • 59 • 1 \ . • 49 \ 1 'I. \. 39 \ ~. \ 291 '. \ ''0 " i lei " '. • ••••••• ,.1. " , ..... _--- I 9! -. --- ---- IW 19 11 12 13 14 pH DISCUSSION A bubbling reactor was used to evaluate the potential of oxidizing NO with NaCl02 in an alkaline scrubbing solution. The synthetic flue gas mixture was bl~nded from compressed gas cylinders and was continuously fed to the scrubbing solution which was the stationary phase in the reactor. The flue gas was introduced into the reactor through a polyethylene sparger located at the bottom of the reactor. Thus the bubble size was influenced by the pressure of flue gas, the size of the sparger openings, and the viscosity of the scrubbing solution. NO was quantitatively absorbed at room temperature and 101.3 12 |
