C - Chemistry – Metallurgy – 25 – B
Patent
C - Chemistry, Metallurgy
25
B
C25B 1/26 (2006.01) C01B 11/02 (2006.01)
Patent
CA 2079634
In an integrated methanol chlorine dioxide process for the production of alkali or alkaline earth metal chlorates and chlorine dioxide, chromium compound impurities (that reduce chlorine dioxide generating process efficiency) in the alkali or alkaline earth metal chlorate aqueous solution produced by an electrochemical cell are removed and recycled to said electrochemical cell. A substantially chromium compound free (about 10 parts per million or less chromium ions) alkali or alkaline earth metal chlorate is converted to chlorine dioxide and by-products; and the by-products are converted to substantially chlorine-free carbon dioxide, which is vented, and a dilute solution of an alkali or alkaline earth metal chlorate, which is recycled to the electrochemical cell. The chromium compounds present in an aqueous solution of alkali or alkaline earth metal chlorate, are removed by reacting the chromium compounds with a reducing agent consisting of hydroxylamine, an addition compound thereof and salt thereof so as to form a precipitate which is removed and an aqueous solution of an alkali or alkaline earth metal chlorate, which is substantially free of chromium compounds, is reacted with an acid and methanol to produce chlorine dioxide and alkali or alkaline earth metalhypochlorite and carbonate by-products, and the by-products are converted to carbon dioxide and a dilute solution of an alkali or alkaline earth metal chlorate by reacting the by-products with an acid or an acid gas.
Gowling Lafleur Henderson Llp
Huron Tech Corp.
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