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The manufacture method of sodium hypochlorite aqueous solution

A technology of sodium hypochlorite and its manufacturing method, which is applied in the direction of hypochlorous acid, hypochlorite, chemical instruments and methods, etc., which can solve the problems of increased decomposition, deterioration of consumed resources, etc., and achieve the effect of high yield

Active Publication Date: 2018-06-08
RESONAC CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, if the reaction temperature is high, the amount of decomposition of sodium hypochlorite will increase, especially at 40° C. or higher, the decomposition will be rapid, so the unit consumption of resources will deteriorate significantly (refer to Non-Patent Document 1)

Method used

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  • The manufacture method of sodium hypochlorite aqueous solution
  • The manufacture method of sodium hypochlorite aqueous solution
  • The manufacture method of sodium hypochlorite aqueous solution

Examples

Experimental program
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Effect test

Embodiment 1

[0084] To those equipped with agitator, coil cooler and external circulation type cooler figure 1 The reaction tank shown, using the figure 2 For the stirring blade shown, the power required for stirring per unit volume is 0.41kW / m 3 And while stirring under the condition that the ratio (Np / Nq) of the required power number Np and the circulation flow number Nq is 2.5, supply 45% by mass of sodium hydroxide aqueous solution as a raw material with 1491kg / hour, this hydroxide The sodium aqueous solution was maintained at 30° C., and chlorine gas was introduced at 560 kg / hour to perform a chlorination reaction so that the average residence time was about 100 minutes. Furthermore, the power P=2.22kW required for stirring, the density ρ=1500kg / m of the reaction solution 3 , rotation speed n=1.30rps, stirring blade diameter d=0.67m, total circulation flow q=0.351m 3 / s, so by Np≡P / (ρn 3 d 5 ) and Nq≡q / (nd 3 ) to calculate Np=5 and Nq=2.

[0085] Then, extract 2051kg / hour reac...

Embodiment 2

[0088] To those equipped with agitator, coil cooler and external circulation type cooler figure 1 The reaction tank shown, using the image 3 For the stirring blade shown, the power required for stirring per unit volume is 0.41kW / m 3 And Np / Nq is 7.1 conditions while stirring, with 1442kg / hour supply 45 mass % sodium hydroxide aqueous solution as raw material, this sodium hydroxide aqueous solution is maintained at 30 ℃, and introduce chlorine gas with 552kg / hour, make the average The chlorination reaction proceeded so that the residence time became about 100 minutes. Furthermore, the power P=2.22kW required for stirring, the density ρ=1500kg / m of the reaction solution 3 , rotation speed n=1.30rps, stirring blade diameter d=0.67m, total circulation flow q=0.27m 3 / s, so by Np≡P / (ρn 3 d 5 ) and Nq≡q / (nd 3 ) to calculate Np=5 and Nq=0.7.

[0089] Next, extract 2018kg / hour reactant slurry from reaction tank, carry out solid-liquid separation with centrifuge, thus obtain...

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Abstract

Provided is a method for producing a sodium hypochlorite aqueous solution with a low content of impurities such as chloric acid and sodium chloride at a high yield. The manufacture method of the low-salt sodium hypochlorite aqueous solution of the present invention is characterized in that, comprises: operation (1), this operation supplies the sodium hydroxide aqueous solution of 30~60 mass % in reaction tank; Operation (2), this operation supplies Into the sodium hydroxide aqueous solution in this reaction tank, introduce chlorine gas, carry out chlorination reaction at the reaction temperature of 20 ℃~50 ℃; Separation and removal from the reaction solution to obtain sodium hypochlorite aqueous solution, step (2), in the stirring required power per unit volume is 0.1 ~ 15kW / m3, and the ratio of the required power standard number Np and the circulating flow rate Nq (Np / Nq) is carried out under the condition of 0.5-8 while stirring.

Description

technical field [0001] The present invention relates to a method for efficiently producing a sodium hypochlorite aqueous solution having a low sodium chloride concentration and a low chloric acid concentration. Background technique [0002] It is known that sodium hypochlorite (NaClO) has excellent bactericidal effect and bleaching effect, and it is generally in the state of aqueous solution, and is widely used in: general industrial chemicals; sterilizing purposes such as swimming pools, waterways, sewers and households; or paper industry, fiber industry bleaching purposes such as, or the use of chemicals in the drainage area. [0003] As an aqueous solution of sodium hypochlorite, it is generally commercially available: a general-purpose aqueous solution of sodium hypochlorite containing about 10 mass % of a reaction by-product, i.e. sodium chloride, based on an available chlorine concentration of 12 mass %; Salt sodium hypochlorite aqueous solution. [0004] In order to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B11/06
CPCA01N59/08C01B11/06C01B11/062
Inventor 谷本阳祐田口真一郎山崎久美子
Owner RESONAC CORPORATION
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