14333-14-3Relevant academic research and scientific papers
REGENERATION OF PERMANGANATE FROM SPENT SOLUTION OF OXIDIZING AGENT USED FOR PURIFICATION OF GAS BLOWOUTS.
Dobryshin,Kirillov,Golovkina
, p. 1277 - 1278 (2008/10/08)
The purification of gas blowouts in food production and in other branches of industry is carried out by means of potassium permanganate in a slightly alkaline solution. KMnO//4 is thus reduced to MnO//2. Manganese dioxide is an ecologically harmful compound and is discharged with wastewaters to reservoirs. To allow for multiple use of KMnO//4 and to prevent dumping the manganese compounds into water reservoirs, it is proposed that the permanganate from manganese dioxide be regenerated by treating the latter with sodium (potassium or calcium) hypochlorite. Further studies show that the regeneration of permanganate from the dioxide by oxidation by hypochlorite can proceed only in the presence of catalysts - Cu(II), Ag(I), Co(II), and Fe(III) ions - at t equals 65-95 degree C, and the color of the solution passes from bright green to red-violet. The experimental data show that the rate of conversion of manganese dioxide into permanganate is determined by the temperature and amount of catalyst introduced. At t less than 50 degree C, the process practically ceases, even at a large content of the catalyst in the solution (more than 10% of the amount of MnO//2). The most vigorous formation of the permanganate takes place in the temperature range from 75 to 90 degree C. Higher temperature negatively affects the yield of permanganate.
