تخريب كاتاليزوري رزين مبادله كننده كاتيوني DOWEX مصرف شده با استفاده از پراكسيد هيدروژن

Catalytic Destruction of Spent Dowex Cation Exchange Resin, Using Hydrogen Peroxide.

The present work focused on the catalytic destruction of Dowex cation exchange resin with hydrogen peroxide in the presence of Fe(II) ion catalyst. A 0.005 mol/lit of Fe(II) concentration with the continuous mixing rate of 500 sec^-1 was used for catalytic decomposition of 2 grams of dried resin (80 °C, 8 hr) with the efficiency of destruction or decomposition of 90 and 97 percent (carbon reducing percent), where it was needed to use 30 and 45 ml of hydrogen peroxide of 30%, respectively. This amount of resin can be decomposed to soluble polystyrene sulfunate just with 10 ml of hydrogen peroxide of 30% and with 20 ml of hydrogen peroxide we can reach %80 efficiency. Also, it was found that the intermittent addition of hydrogen peroxide is showing a good effect, and by changing the pH between 2 and 4 no significant effect on the reaction efficiency was found. The optimum conditions based on this study are as follows: 0.5 ml/min hydrogen peroxide, 95 to 100 °C, 3.5 pH and 0.005 mol/L of Fe(II) concentration with continuous mixing rate of 500 sec^-1.