The Production of Sodium Perchlorate on the Lead Dioxide Electrode and Its Corrosion Behavior

• Main Authors: Shuo Chao, 趙碩
• Other Authors: Ten-Chin Wen
• Format: Others
• Language: zh-TW
• Published: 1994
• Online Access: http://ndltd.ncl.edu.tw/handle/88089766044093839974

碩士 === 國立成功大學 === 化學工程研究所 === 82 === The content of this thesis can be majorly divided into two parts. The effect ofelectrolysis conditions on the NaClO4 produc- tion current efficiency and PbO2 corrosion during NaClO4 produc- tion was studied in the first part. The corrosion behaviorof PbO2 anode in O3 and HClO producction process as well asthe effect of H2O2 concentration on PbO2 corrosion were alsoreported in the se- cond part.The effect of such electrolysis conditions as NaClO3 co centration, temperature, NaF concentration and current density on the NaClO4 production current efficiency and anode stability has been systematically studied using fractional factorial design. Fra ctional factorial analysis indicates that the main and interactio effects of NaClO3 concentration, temperature and NaF concentratio are the keyvariables influencing NaClO4 production current effici ency. A 98% NaClO4 production current efficiency can be obtained in the following conditions: 1000 mA/cm2 current density, 50℃ an the addition of 2g/L NaF and 2.17g/L H2 SO4 in 6M NaClO3 solution . The results also show that NaClO3 and H2SO4 concentration are the major variables influencing PbO2 stability. The Pb2+ dissolu- tion rate increased with increasing NaClO3 concentration due to the increase in electrode potential with increasing NaClO3 concen tration; while the Pb2+ dissolution rate decreased with increasin H2SO4 concentration due to the formation of PbSO4 at PbO2 electro euring electrolysis which inhibited Pb2+ dissolution. In addition , the effect of such additives as NaF, HBF4, NH4F.HF, and KPF6 on NaClO4 current efficiency and anode stability was also studied . Among the studied additives, the additionof 2g/L NaF generated the maximum current efficiency; while the addition of 0.01M HBF4 generated the maximum anode stability. ....