Method of producing chlorine dioxide

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United States of America Patent

PATENT NO 6585950
SERIAL NO

08659261

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Abstract

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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 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 aqueous medium on a rotary drum filter operating with vacuum inside and with part of the drum submerged in a slurry of the at least partially neutralized solid alkali metal sulfate and the aqueous medium, and forming an acid filtrate.

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Patent Owner(s)

Patent OwnerAddress
AKZO NOBEL PULP AND PERFORMANCE CHEMICALS ABSE-445 80 BOHUS

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Byrne, Philip Tullinge, SE 4 23
Dahl, Anders Saltsjo-Boo, SE 17 55
Hammer-Olsen, Roy Sundsvall, SE 7 38

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