C - Chemistry – Metallurgy – 25 – B
Patent
C - Chemistry, Metallurgy
25
B
204/65
C25B 1/26 (2006.01) C01B 11/02 (2006.01)
Patent
CA 1105877
ABSTRACT OF THE DISCLOSURE This invention discloses a process for producing chloride dioxide which comprises (1) feeding hydrochloric acid and an excess on a stoichiometric basis of sodium chlorate produced in an electro- lytic cell for producing sodium chlorate into a reaction zone for producing chlorine dioxide; (2) reacting the hydrochloric acid and the sodium chlorate in the reaction zone to form a gaseous reaction product containing chlorine dioxide and chlorine and so that sodium chloride produced is precipitated to form a slurry-like residual reaction mixture containing the precipitated sodium chloride; (3) continuously removing the chlorine dioxide and the chlorine as the gaseous reaction product; (4) simultaneously withdrawing the slurry-like residual reaction mixture containing the precipitated sodium chloride continuously from the reaction zone; (5) feeding water to the withdrawn residual reaction mixture to dissolve the sodium chloride and form a solution containing sodium chloride; (6) blowing air or an inert gas through the solution containing sodium chloride to remove any residual chlorine dioxde and chlorine from the solution; (7) recycling the chlorine dioxide and chlorine removed from the solution to the reaction zone through an equalizing line; and (8) then recycling the solution to an electrolytic cell for the production of sodium chlorate. This process is superior to the prior art processes in terms of equipment used and economy achieved and has also eliminated the risk of explosion caused by the reaction of hydrogen and chlorine in the electrolytic cell which is present in the prior art processes.
304720
Chlorine Engineers Corp. Ltd.
George H. Riches And Associates
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