In the previous report, it was explained that O
2-SO
2 mixed gas oxidized the phosphorous acid to phosphoric acid. In this report, effects of reaction conditions, such as agitation speed, partial pressure of oxygen, pH, and temperature, on the aqueous oxidation of H
3PO
3 by O
2-SO
2 mixed gas are investigated. The results were summarized as follows.
Agitation speed hardly changes over 1,000min-1 on the oxidation rate of H
3PO
3. The oxidation rate of H
3PO
3 is proportional to the partial pressure of oxygen. The oxidation rate of H
3PO
3 increases with the increase of pH. With the rise in solution temperature, the oxidation rate of H
3PO
3 increases, however, the temperature dependency is low. In all conditions of reaction, the quantity of H
3PO
3 oxidized did not exceed the quantity of SO
2 oxidized. Within the range of these experimental conditions, the oxidation rate of SO
2 was not affected.
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