The heterogeneous oxidation of ammonium sulfite solution was investigated i
n stirred cell and packing column. The concentration range of sulfite is 0.
05-4.7 gmol/l and that of oxygen in the gas phase is 21-100%, temperature r
ange is 30-75 degreesC. The results indicated that there is a critical sulf
ite concentration, below which the reaction order with respect to sulfite i
s 0.2, while above which the order turns to - 1.0. The reaction order with
respect to oxygen is 1. Apparently, the ionic strength was found to inhibit
the oxidation. The apparent energy of activation determined is 32.7 kJ/mol
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