| Summary: | 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.
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