Chemistry of inorganic compounds – Halogen or compound thereof – Chlorine dioxide
Patent
1992-02-26
1994-06-28
Gorgos, Kathryn
Chemistry of inorganic compounds
Halogen or compound thereof
Chlorine dioxide
423487, 204 95, 204277, 204278, 422189, 422198, 422211, 422218, 422234, 422307, C01B 1102, C25B 126
Patent
active
053244974
ABSTRACT:
A novel continuous process and system are provided for the production of chlorine dioxide at favorable 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 about 400 to about 1,200 g/L, and a chloride ion concentration of about 90 to about 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 generating zone. The chemical reaction is between an all scale metal chlorate concentration of about 400 to about 1,200 g/L and an alkali metal chloride concentration of about 90 to about 120 g/L and over about 90 g/L chloride ion concentration. The reaction is driven by the high chlorate and chloride ion concentrations, 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 recycling within the process system.
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Gorgos Kathryn
Weinstein Louis
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