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Production process of aqueous sodium hypochlorite solution

A technology of sodium hypochlorite and its manufacturing method, which is applied in the direction of hypochlorous acid, hypochlorite, chemical instruments and methods, and can solve problems such as increased decomposition and deterioration of consumed resources

Inactive Publication Date: 2015-07-01
SHOWA DENKO KK
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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 increases, especially at 40° C. or higher, the decomposition is rapid, so the unit consumption of resources is greatly deteriorated (refer to non-patent document 1)

Method used

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  • Production process of aqueous sodium hypochlorite solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] To a reaction tank equipped with a stirrer, a coil cooler, and an external circulation cooler, a 45% by mass aqueous sodium hydroxide solution was supplied as a raw material at 1514 kg / hour while stirring, and the aqueous sodium hydroxide solution was maintained at 40° C. , and 560 kg / hour of chlorine gas was diluted to 50% by volume with nitrogen gas and introduced, and the chlorination reaction was carried out so that the residence time became about 100 minutes.

[0062] Extract the reactant slurry at 2074kg / hour from the reaction tank, and carry out solid-liquid separation with a centrifuge, thus obtaining 682kg / hour of precipitated sodium chloride and 1390kg / hour of sodium hypochlorite concentration of 34.5% by mass, sodium chloride concentration It is 4.5 mass %, and the low-salt sodium hypochlorite aqueous solution whose chlorate ion concentration is 0.41 mass %. The yield at this time was 95.9%. It should be noted that the yield is a value calculated from the nu...

Embodiment 2

[0065] To a reaction tank equipped with a stirrer, a coil cooler, and an external circulation cooler, a 45% by mass aqueous sodium hydroxide solution was supplied as a raw material at 1512 kg / hour while stirring, and the aqueous sodium hydroxide solution was maintained at 35° C. , and 560 kg / hour of chlorine gas was diluted to 50% by volume with nitrogen gas and introduced, and the chlorination reaction was carried out so that the residence time became about 100 minutes.

[0066] Extract the reactant slurry at 2072kg / hour from the reaction tank, and carry out solid-liquid separation with a centrifuge, thus obtaining 680kg / hour of precipitated sodium chloride and 1390kg / hour of sodium hypochlorite concentration of 35.4% by mass, sodium chloride concentration It is 4.2 mass %, and the low-salt sodium hypochlorite aqueous solution whose chlorate ion concentration is 0.29 mass %. The yield at this time was 97.3%.

[0067] The obtained low-salt sodium hypochlorite aqueous solution...

Embodiment 3

[0069] To a reaction tank equipped with a stirrer, a coil cooler, and an external circulation cooler, a 45% by mass aqueous sodium hydroxide solution was supplied as a raw material at 1513 kg / hour while stirring, and the aqueous sodium hydroxide solution was maintained at 30° C. , and 556 kg / hour of chlorine gas was diluted to 95% by volume with nitrogen gas and introduced, and the chlorination reaction was carried out so that the residence time became about 100 minutes.

[0070] Extract the reactant slurry with 2069kg / hour from the reaction tank, and carry out solid-liquid separation with a centrifuge, thus obtaining 642kg / hour of sodium chloride and 1427kg / hour of sodium hypochlorite concentration of 33.3% by mass, sodium chloride concentration It is 4.4 mass %, and the low-salt sodium hypochlorite aqueous solution whose chlorate ion concentration is 0.84 mass %. The yield at this time was 93.1%.

[0071] The obtained low-salt sodium hypochlorite aqueous solution was dilute...

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Abstract

The present invention provides a method for manufacturing a low-salt sodium hypochlorite solution in high efficiency. The method comprises: a step (1), a supply of 30 to 60% by mass of aqueous sodium hydroxide to a reaction vessel; step (2), introduced chlorine gas, which is diluted with an inert gas, to the aqueous sodium hydroxide itIt is supplied to the reaction tank and chlorination at 20-50 DEG C of reaction temperature; and the step (3), separating and removing precipitated byproduct, sodium chloride, from the reaction mixture to obtain the aqueous solution of sodium hypochlorite.

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, generally in the state of aqueous solution, it is widely used in: general industrial chemicals; sterilizing purposes of swimming pools, waterways, sewers and households, etc.; or paper industry, fiber For bleaching purposes in industry, etc., or as a reagent for drainage. [0003] As an aqueous solution of sodium hypochlorite, generally commercially available is based on an available chlorine concentration of 12 mass %, a general-purpose aqueous solution of sodium hypochlorite containing about 10 mass % of a reaction by-product, i.e. sodium chloride; Sodium hypochlorite aqueous solution. [0004] As a method for producing a low-salt sodi...

Claims

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Application Information

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IPC IPC(8): C01B11/06
CPCA01N59/08C01B11/06C01B11/062
Inventor 谷本阳祐村川美奈子加贺一有
Owner SHOWA DENKO KK
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