C - Chemistry – Metallurgy – 25 – B
Patent
C - Chemistry, Metallurgy
25
B
C25B 1/26 (2006.01) C01B 11/02 (2006.01) C25B 9/00 (2006.01)
Patent
CA 2085682
ABSTRACT OF THE DISCLOSURE A novel continuous process and system are provided for the production of chlorine dioxide at favourable economics and high efficiency. The process involves effecting electrolysis of an aqueous solution of alkali metal chloride, in an electrolysis zone, to form an aqueous solution of alkali metal chlorate having a chlorate ion concentration of 400 to 1,200 g/L, and a chloride ion concentration of 90 to 120 g/L, gaseous hydrogen and water vapor. Hydrogen is conducted to a hydrogen chloride synthesis system where it reacts with chlorine gas, (recycled, as well as make-up,) to yield hydrogen chloride gas which is quenched with water to provide hydrochloric acid. A solution of alkali metal chlorate is conducted from the electrolysis zone to the chlorine dioxide generat- ing zone to provide over 400 g/L chlorate ion concentration and over 90 g/L chloride ion concentration. The reaction is driven by the high chlorate ion concentration, high reacting temperature and with the hydrochloric acid injected through multi-capillary tubes at high velocity. The reaction provides chlorine dioxide gas with some by- product chlorine, which is at least in part separated by an auxiliary chlorine dioxide absorbing in-loop system. The unreacted chlorate/chloride solution from the chlorine dioxide generator is recycled to the electrolysis zone. The alkali metal is sodium or lithium at the very high chlorate ion concentrations. The method includes methods for recovering chlorine as gas or an equivalent chloride for recycle within the process system.
Marcus & Associates
Westerlund G. Oscar
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