Lead dioxide anodes in the large scale production of potassium chlorate from potassium chloride
✍ Scribed by Udupa, H. V. K. ;Sampath, S. ;Narasimham, K. C. ;Nagalingam, M. ;Thiagarajan, N. ;Subramanian, G. ;Subbiah, P. ;Palanisamy, R. ;Peter, S. John ;Pushpavanam, S. ;Sadagopalan, M.
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 2007
- Tongue
- English
- Weight
- 232 KB
- Volume
- 24
- Category
- Article
- ISSN
- 0375-9210
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✦ Synopsis
Abstract
Potassium chlorate, which is used mainly in the manufacture of matches, was prepared by the electrolytic oxidation of potassium chloride in an 800 A cell using graphite substrate lead dioxide anode and stainless steel cathode. The cell was operated at an anode current density of 5 A/dm^2^, a temperature of 55 to 60 °C and a pH of 6.0 to 7.0. A current efficiency of 82 to 85% was obtained and an assay yield of 77% was realised for the recrystallised product. The cell voltage was 3.2 to 3.3 V with an energy consumption of 6.3 to 6.5 kWh (d.c.)/kg of potassium chlorate produced.
The cell effluent, being clear and free from suspended impurities, could be processed further without filtration and pure potassium chlorate (>99%) was obtained by recrystallisation.