Abstract
The removal of dissolved oxygen in boiler feed water is necessary, in order to prevent the boiler corrosion.
Sodium sulphite has been used as a chemical for the removal of oxygen in water. But because sodium sulphite increases the total dissolved solids in boiler water, hydrazine is beginning to be adapted recently instead.
However, the rate of reaction between hydrazine and oxygen in not yet fully established. Therefore, the writer investigated this point, and following results were obtained.
(1) The rate of reaction between hydrazine and oxygen was quite low. The pH value of solution had no effect on the rate of reaction. Copper ions increased the rate of reaction but nickel and manganese ions had no effect.
(2) When distilled water was used, the original oxygen content of about 8.5 ppm reduced by hydrazine after 5 hours to 0.05 ppm. In this occasion, the content of hydrazine was more than 16 ppm and the content of copper ions was varied bewteen 1 ppm and 3 ppm.
