Method of producing chlorine dioxide employs alkaline...

Details Method of producing chlorine dioxide employs alkaline... Method of producing chlorine dioxide employs alkaline...

2005-07-26

2005-07-26

Nguyen, Ngoc-Yen (Department: 1754)

Chemistry of inorganic compounds

Halogen or compound thereof

Chlorine dioxide

C423S479000, C071S035000, C071S051000

Reexamination Certificate

active

06921521

ABSTRACT:
A method of producing chlorine dioxide (ClO2) is described which employs Urea as a reducing agent to reduce alkaline chlorate (NaClO3or KClO3) in a mineral acid medium. The method of the invention can, for example, by means of a very high transfer rate, be used to reduce over 90% of the reactant, alkaline chlorate, to the product, chlorine dioxide. Furthermore, ClO2product purity is accomplished, for example, over 95%. The mother solution of the reaction can then be processed, for example, to produce other useful inorganic salts, including potassium sulfate, potassium nitrate, sodium nitrate, and the like, and/or compound fertilizer resulting in useful chemical products rather than toxic waste. Accordingly, the method of the invention provides for efficient, cost effective, and safe production of ClO2as well as inorganic salts and/or compound fertilizer.

REFERENCES:
patent: 3764663 (1973-10-01), Sims et al.
patent: 5273733 (1993-12-01), Winters et al.
patent: 5324497 (1994-06-01), Westerlund
patent: 5545389 (1996-08-01), Winters et al.

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