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clo2 prepare |
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Answer» Inthe laboratory, ClO2can be prepared by oxidation ofsodium chloritewith chlorine: 2 NaClO2+ Cl2→ 2 ClO2+ 2 NaCl Traditionally, chlorine dioxide fordisinfectionapplications has been made from sodiumchloriteor the sodium chlorite – hypochlorite method: 2 NaClO2+ 2 HCl + NaOCl → 2 ClO2+ 3 NaCl + H2O or the sodium chlorite – hydrochloric acid method: 5 NaClO2+ 4 HCl → 5 NaCl + 4 ClO2+ 2 H2O or the chlorite – sulfuric acid method: 8ClO2−+ 4H2SO4→ 4ClO2+ 2HClO3+ 4SO42−+ 2H2O + 2HCl All three sodium chlorite chemistries can produce chlorine dioxide with high chlorite conversion yield, but unlike the other processes the chlorite-sulfuric acid method produces completely chlorine-free chlorine dioxide, although it suffers from the requirement of 25% more chlorite to produce an equivalent amount of chlorine dioxide. Alternatively,hydrogen peroxidemay be efficiently used in small-scale applications |
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