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Study on NO2 absorption aimed at seeking a better NO2 absorption chemical at pH 4.5～7.0 for application to existing wet flue gas desulfurization (FGD). The results from the double-stirred reactor indicated thru ascorbic acid has very high absorption rate at this pH range. The rate constant of ascorbic acid reaction with NO2 (0～1000× 10-6 mol/mol) is about 3.54× 106 mol/(L.s)at pH 5.4～6.5 at 55 ℃.