Method of producing chlorine dioxide
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United States of America Patent
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Oct 7, 1997
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N/A
app pub date -
Jun 6, 1996
filing date -
Jun 7, 1995
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Abstract
The invention relates to a process of producing chlorine dioxide comprising the steps of reducing chlorate ions in an acid reaction medium maintained in a reaction zone of a chlorine dioxide generator, which reaction medium contains alkali metal ions and sulfate ions, so to form chlorine dioxide and a solid salt of acidic alkali metal sulfate. The process further comprises the steps of separating said solid acidic alkali metal sulfate from the reaction medium, contacting said solid acidic alkali metal sulfate with an acid aqueous medium in a mixing tank to effect at least partial conversion to neutral solid alkali metal sulfate, separating the at least partially neutralized solid alkali metal sulfate from the acid aqueous medium on a filter and forming an acid filtrate, feeding at least a portion of said acid filtrate to the mixing tank, and transferring an acid aqueous medium to the reaction zone of the chlorine dioxide generator, which acid aqueous medium is a portion of the acid filtrate or acid aqueous medium from the mixing tank or a mixture thereof.
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