A kind of method for preparing sodium hypochlorite

Abstract

The invention discloses a method for preparing sodium hypochlorite. The method comprises the following steps that step 1, water is added to a sodium hydroxide solution for dilution, a stabilizing agent is added, and the mixture is stirred uniformly; step 2, the diluted sodium hydroxide solution and the stabilizing agent enter a first cooler for cooling and then pass through a falling-film absorption tower, cooled chlorine is fed for reaction, and a reaction endpoint is monitored; step 3, the mixture is cooled by a second cooler, the cooled product is fed to a packing absorption tower, cooled chlorine is fed for reaction, and a reaction endpoint is monitored; step 4, the mixture is cooled by a third cooler and then is fed to a finished product storage tank; the stabilizing agent comprises silicon nitride, sodium silicate and sodium chloride, the adding amount of the silicon nitride is 3-6 mg / L, the adding amount of the sodium silicate is 1-5 mg / L, and the adding amount of the sodium chloride is 1-3.5 mg / L. The method for preparing the sodium hypochlorite has the advantages that the raw material input is reduced by improving the stability of the sodium hypochlorite, the production cost and the tail gas treatment cost are reduced, the economic growth pursuing requirement is met, and the environment protection and green concept is met.

Description

technical field [0001] The invention relates to the field of chlor-alkali industry, in particular to a method for preparing sodium hypochlorite. Background technique [0002] Sodium hypochlorite is a high-efficiency oxidant and chlorine-containing disinfectant. It is used as a bleaching agent, oxidizing agent and water purifier for papermaking, textile, light industry, etc. It has the functions of bleaching, sterilization and disinfection. It has strong oxidation ability, fast action and good effect, and its functions are very extensive. The preparation methods of sodium hypochlorite in the prior art mainly include brine electrolysis, chlorine gas and sodium hydroxide contact reaction. [0003] The Chinese patent with publication number 105197892A discloses a new production process of sodium hypochlorite, which can increase the output of sodium hypochlorite, reduce the intensity of workers' operation, realize stable real-time monitoring, and improve monitoring accuracy. Bu...

AI Technical Summary

Problems solved by technology

However, this process only increases the output of sodium hypochlorite from the improvement of production speed, and in the production process of sodium hypochlorite, sodium hypochlorite is easily decomposed to generate sodium chloride and oxygen, resulting in a decrease in available chlorine content

In order to ensure that the available chlorine content of the product meets the standard, the input of raw materials will be increased, thereby increasing the production cost and the cost of tail gas treatment, which needs to be improved

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