C - Chemistry – Metallurgy – 25 – B
Patent
C - Chemistry, Metallurgy
25
B
9/2, 204/65, 8/7
C25B 1/26 (2006.01) D21C 9/14 (2006.01)
Patent
CA 1053604
ABSTRACT OF THE DISCLOSURE A continuous cyclic process for the production of chlorine dioxide includes the formation of a gaseous mixture of chlorine dioxide, chlorine and steam from an aqueous reaction medium containing sodium chlorate and hydrochloric acid at an activity below about 1N. Chlorine dioxide is recovered from the gaseous mixture. Sodium chloride formed in the reaction is deposited in the reac- tion vessel and is removed therefrom. The continuous cyclic process forms part of an effluent dioxide is used as a bleaching chemical and from which sodium chloride is removed. Sodium hydroxide solution used in caustic extrac- tion of the pulp in the bleach plant is formed by electro- lysis of an aqueous solution sodium chloride, which may be formed from that removed from the chlorine dioxide genera- tor and/or recovered from the pulp mill. Sodium chlorate feed for the chlorine dioxide generator is formed by electrolysis of aqueous sodium chloride solution, which may be formed from that removed from the chlorine dioxide generator and/or recovered from the pulp mill and not used to form sodium hydroxide solution. Inefficiencies in the production of chlorine dioxide and losses from the system are made up by the use of additional chlorine and sodium chloride. - 1 -
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