Chlorine dioxide generation process

Abstract

The invention relates to the technical field of chlorine dioxide preparation, in particular to a chlorine dioxide generation process which comprises the following steps: S1, adding a chlorite solution into a closed container; S2, pressurizing and injecting a hydrochloric acid solution from the bottom of the closed container; S3, introducing chlorine from the bottom of the closed container in a pressurized mode, and opening an exhaust port in the top of the closed container to exhaust redundant chlorine during injection; S4, forming a mixed solution under the condition that a large amount of water exists in the solution in the closed container; S5, enabling the mixed solution in the step S4 to flow out of the bottom of the closed container and conveying the mixed solution into a separator through a pipeline; S6, due to overflowing of residual chlorine dioxide in the mixed solution in the pipeline in the flowing process, feeding gaseous chlorine dioxide into an atomizing chamber from the top of the separator to form a chlorine dioxide disinfectant with water; and S7, enabling residual liquid to flow out of the lower end of the separator. The method is high in preparation efficiency and safe, resources are fully utilized, and waste is reduced.

Description

technical field [0001] The invention relates to the technical field of chlorine dioxide preparation, in particular to a chlorine dioxide generation process. Background technique [0002] Chlorine dioxide (ClO 2 ) is a yellow-green to orange-yellow gas, mainly used for bleaching of pulp and paper, fiber, wheat flour, starch, refining and bleaching of oil, beeswax, etc. The disinfection and sterilization treatment of drinking water is internationally recognized as a safe and low-toxic green disinfectant. The existing chlorine dioxide generation process is mainly carried out in two ways: [0003] The first pass through chlorine (Cl2) and sodium chlorite (NaClO 2 ) preparation, the reaction formula is as follows: Cl 2 +2NaClO 2 →2ClO 2 +2NaCl (3) [0004] Second pass or hydrochloric acid (HCl) with sodium chlorite (NaClO 2 ) production, the reaction formula is as follows: 5NaClO 2 +4HCl→4ClO 2 +5NaCl+2H 2 O (4) [0005] In the actual preparation process, both methods...

AI Technical Summary

Problems solved by technology

[0005] In the actual preparation process, both methods have disadvantages, and the preparation of ClO according to formula (3) 2 In theory, 1 mol of chlorine and 2 mol of sodium chlorite can react to produce 2 mol of chlorine dioxide, but in practice, in order to speed up the reaction, the dosage of chlorine often exceeds the stoichiometric theoretical value, so that the product will contain some free chlorine Cl 2 ; As a disinfectant for polluted water, excess free chlorine may produce THMs; if there is too much free chlorine, ClO 2 May also be oxidized to ClO 3 However, the bactericidal ability is reduced. In addition, the chlorine gas of this method needs to be added by a chlorinator, which is complicated to operate and occupies a large area.

[0006] Preparation of ClO according to formula (4) 2 Attention should be paid to two reactants (NaClO 2 and HCl) concentration control, if the concentration is too high, it will explode when combined, and the preparation risk is greater