Continuous preparation method for sodium hypochlorite

Abstract

The invention discloses a continuous preparation method for sodium hypochlorite, which comprises the following steps of: a. sodium hydroxide solution preparation: preparing a sodium hydroxide aqueous solution in an alkali dosing tank according to preset concentration; b. first-class mixture: fully mixing the sodium hydroxide solution obtained in the step a with a sodium hypochlorite mother solution in a first-class circulating tank; c. first-class absorption reaction: filling mixed liquid obtained in the step b into a first-class absorbing tower for carrying out first-class absorption reaction with chlorine; d. second-class mixture: fully mixing reaction liquid obtained in the step c with the sodium hypochlorite mother solution in a second-class circulating tank; and e. second-class absorption reaction: filling mixed liquid obtained in the step d into a second-class absorbing tower for carrying out second-class absorption reaction with the chlorine to finish the preparation of sodium hypochlorite. The invention can stably obtain a high-quality product just by two-class one-step absorption and really realize the continuous production of the sodium hypochlorite, has higher productivity, greatly saves energy and is easier to realize the production of the high-quality product.

Description

technical field [0001] The invention relates to a preparation method of sodium hypochlorite, in particular to a continuous preparation method of sodium hypochlorite. Background technique [0002] Sodium hypochlorite is a multi-purpose and multi-functional chemical product, which can be used as a bleaching agent in the textile and paper industry for disinfection, sterilization, and in the production of organic chemical products. Production of cyanuric acid. In recent years, with the vigorous development of sanitary disinfection paper, sodium hypochlorite has made great progress as a cheap bleaching agent. [0003] The conventional sodium hypochlorite preparation process is to pass chlorine gas into a certain concentration of sodium hydroxide solution. Usually, the available chlorine content of the obtained sodium hypochlorite is 10%-13%, and the free alkali content is ≤1%. Because the concentration of sodium hypochlorite is low, sodium chloride is difficult to separate out,...

AI Technical Summary

Problems solved by technology

The preparation method of this repeated circulation absorption, owing to need repeatedly circulation absorption in the absorption tower, can't realize continuous production, causes production efficiency to be lower, serious waste of energy, and the sodium hypochlorite content and output in the obtained product are also restricted to a large extent

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