亚氯酸盐制备二氧化氯的pε-pH图分析  

Effects of pε and pH on the Generation of Chlorine Dioxide from Chlorite Salt

作　　者：田朝晖[1] 裴元生[1] 

机构地区：[1]兰州铁道学院环境科学与工程学院,甘肃兰州730070

出　　处：《兰州铁道学院学报》2002年第1期97-100,共4页Journal of Lanzhou Railway University

摘　　要：在三元氯氧化物平衡基础上 ,建立了包括HClO2 、ClO-2 、HOCl、OCl-、Cl2 (aq)和Cl的多元氯氧化物pε- pH图 ,探讨了标准状态下电子活度 (pε)和pH对ClO2 制备的影响 .采用Cl2 (aq)和ClO-2 制备ClO2 时 ,理想的pH条件是 1.35～ 1.94 ,pε大于 2 3.31;当采用Cl2 (g)与ClO-2 溶液直接接触制备ClO2 时 ,由于Cl2 歧化为HOCl的反应时间缩短 ,可以抑制副产物的形成 .The predominance area diagrams of electron activity (pε) as a function of pH for chlorine system with multi-oxychlorine species have been constructed. On the base of the diagrams, pε and pH directly dominate the generation of chlorine dioxide (ClO 2).Generation processes are, in fact, to shift the equilibria of chlorine system into the predominance area of ClO 2 in view of the processes of acidification, oxidization and reduction. The optimal pH condition for generation of ClO 2 by contacting chlorine gas directly with chlorite solution is within pH 1.35～1.94. Only for minimizing the formation of molecular chlorine, the pH ranges may approach to 1.35～4.00. Thus, it is practically unachievable to generate pure ClO 2 from chlorite.

关 键 词：二氧化氯 亚氯酸盐 反应自由能 pε-pH图 三元氯氧化物平衡 

分 类 号：O613.42[理学—无机化学] O642.4[理学—化学]