Abstract
The decomposition rate of chlorate (NaClO3) in aqueous solutions (brines) containing initially 6:1 mol/mol HCl:NaClO3 is studied at 90°C at various NaCl contents experimentally. A strong positive effect of NaCl addition is shown on the decomposition rate of chlorate. It is found more reasonable in the chlor-alkali industry first to saturate the brine by sodium chloride and only then to eliminate from it the chlorate by adding HCl (before the solution is transferred into the electrolysis cell to be protected from the chlorate ions).
Highlights
1 Introduction Unwanted chlorate ions form as a side-product in chloralkali membrane electrolysis cells [1,2,3]
When steady state is established from point of view of solution flow, nitrogen flow and temperature, HCl is added in the amount of 6:1 HCl:NaClO3
A blank experiment was run with zero amount of HCl under all other parameters kept constant
Summary
Unwanted chlorate ions form as a side-product in chloralkali membrane electrolysis cells [1,2,3]. Reduction and elimination of chlorate from brines is of high industrial importance [4,5,6,7,8,9] For this reason many papers have been devoted to study chlorate-chloride reactions [10,11,12,13,14,15,16,17]. The chlorate content of the brine should be kept below an acceptable level, as its presence is detrimental for the membrane in the electrolytic cell. This is possible only if the chlorate is decomposed /eliminated/ reduced in each production cycle.
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