A clean production process of sodium chlorite from sodium chlorate |
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| Institution: | 1. EryDel SpA, via Sasso 36, 61029, Urbino (PU), Italy;2. Department of Biomolecular Sciences, University of Urbino “Carlo Bo”, via Saffi 2, 61029, Urbino (PU), Italy;1. Permanent address: Linnarhultsv 16, Angered, SE 42455, Sweden;2. AkzoNobel Pulp and Performance Chemicals AB, SE 44580 Bohus, Sweden;1. Applied Electrochemistry, School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, SE 100-44 Stockholm, Sweden;2. Department of Physical Chemistry and Materials Science, University of Szeged, Rerrich B. square 1., H-6720 Szeged, Hungary;3. PhotoCatalytic Synthesis Group, Faculty of Science and Technology, MESA+ Institute for Nanotechnology, University of Twente, Meander 229, P.O. Box 217, 7500 AE Enschede, The Netherlands;4. AkzoNobel Pulp and Performance Chemicals, SE 445-80 Bohus, Sweden |
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| Abstract: | This paper presents a novel cleaner production process for producing sodium chlorite by reducing sodium chlorate with hydrogen peroxide. In the new process, chlorine dioxide is generated by reducing chlorate ions with hydrogen peroxide in the presence of sulfuric acid: it then reacts with aqueous sodium hydroxide solution and hydrogen peroxide to produce sodium chlorite. The reaction conditions that were experimentally investigated included: reaction temperatures, concentrations of sodium chlorate solution, molar ratio of NaClO3:H2SO4:H2O2, and acidity. Waste acid in the chlorine dioxide generator is dramatically reduced with recycling in the new process. The by-produced sodium sulfate in sulfuric acid is minimized and reclaimed. |
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