Preparation method of sodium hypochlorite

Abstract

The invention discloses a preparation method of sodium hypochlorite. According to the invention, a sodium hydroxide solution is utilized to absorb chlorine gas to prepare the sodium hypochlorite. The preparation method is implemented in a way that: any time before the preparation is finished, measuring the reaction tank liquid level M1 and the free alkali content N1 at that time, and determining the finishing reaction tank liquid level Mend according to the formula Mend=M1+(N1-Nend); and monitoring the reaction tank liquid level M in the subsequent reaction process, and finishing the reaction when M=Mend. According to the relationship between free alkali content difference and reaction liquid value difference of the sodium hypochlorite solution at different liquid levels in the production process, a qualified edge point of the sodium hypochlorite solution is determined by a liquid level metering method, and an empirical formula is educed; and the reaction tank liquid level is monitored to accurately judge the qualified reaction end point of the sodium hypochlorite solution, thereby effectively and conveniently controlling the production qualification rate of the sodium hypochlorite solution, greatly lowering the labor intensity of personnel, reducing the sampling frequency, relieving the problem of environmental pollution on the spot due to sampling, and avoiding the phenomenon of unqualified technical indexes due to shortness of hands or untimely inspection.

Description

Background technique [0001] Sodium hypochlorite solution is often prepared by absorbing chlorine gas with sodium hydroxide solution. In actual production, manual analysis of excess alkali and available chlorine is often used to determine whether the reaction should be terminated. The manual method has shortcomings such as long detection time, large human error, frequent sampling times, etc., especially when the reaction solution is close to passing the test or when there is a large amount of chlorine gas, it is difficult to control, the reaction speed is fast, and it is easy to over-chlorine and run-off chlorine. Manual detection cannot Quickly feedback the test results, and when the sample results are analyzed, the reaction tank has actually been overchlorinated, and the product technical indicators are unqualified, which brings many troubles to the producers. [0002] The publication date is October 3, 2012, the publication number is CN102701157A, and the Chinese invention ...

AI Technical Summary

Problems solved by technology

The manual method has shortcomings such as long detection time, large human error, frequent sampling times, etc., especially when the reaction solution is close to passing the test or when there is a large amount of chlorine gas, it is difficult to control, the reaction speed is fast, and it is easy to over-chlorine and run-off chlorine. Manual detection cannot Quickly feedback the test results, and when the sample results are analyzed, the reaction tank has actually been over-chlorinated, and the product technical indicators are unqualified, which brings many troubles to the producers

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