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Prepn of sodium percarbonate

A technology of sodium percarbonate and silicate, applied in chemical instruments and methods, peroxide/peroxyhydrate/peroxyacid/superoxide/ozone, inorganic chemistry, etc., can solve the content of active oxygen in products Low temperature, humidity, poor thermal stability, low active oxygen content of sodium percarbonate, etc., to achieve the effect of improving reaction stability and increasing active oxygen content

Inactive Publication Date: 2002-01-23
陶华西
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Dry production is to directly spray hydrogen peroxide onto the surface of sodium carbonate. Although the sodium percarbonate produced by this method has good moisture and thermal stability, the production process is relatively complicated, and the raw material requirements are high, and the product active oxygen The content is relatively low, generally between 12 and 13%. Wet production is a product made by reacting hydrogen peroxide and soda ash in the liquid phase, and then crystallizing, centrifuging, and drying. It has the characteristics of simple process and low raw material requirements. , but the active oxygen content of the produced sodium percarbonate is still low, generally 13.0-13.5%, and the moisture and thermal stability are also poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Add 200g of soda ash and 200g of sodium chloride into 1000ml of water, stir to dissolve and add 2.5g of water glass; add 1.5g of magnesium chloride and 0.3g of EDTA into 150g of 50% hydrogen peroxide, and drop the above two solutions into 2000ml of glass at the same time The reaction is carried out in the container, the main reaction is:

[0018]

[0019] During the reaction, the dropping time of soda ash and hydrogen peroxide is controlled to be about 1 hour, and the reaction temperature is controlled at 20±1°C. After the reaction, the wet sodium percarbonate can be obtained by centrifugal suction filtration, and the mother liquor can be reused. The prepared wet sodium percarbonate is dried, and the drying temperature is controlled between 90°C and 150°C, and the finished sodium percarbonate is obtained after drying.

Embodiment 2

[0021] Other conditions of embodiment 1 are constant, add organic phosphonic acid 2.5g again in the hydrogen peroxide of 150g 50%, promptly obtain the finished product sodium percarbonate of about 250g through suction filtration, drying after reaction. Example 3

Embodiment 3

[0022] Other conditions among the embodiment 2 are constant, and the consumption of organic phosphonic acid is increased to 4.0g, promptly obtains the finished product sodium percarbonate of about 250g through suction filtration, oven dry after reaction.

[0023] The test method for the thermal stability of sodium percarbonate is to calculate the loss rate of active oxygen by placing the sample at 100°C for 6 hours.

[0024] The test method for the wet stability of sodium percarbonate is to place the sample open under the conditions of 32°C and 80%RH, and calculate the loss rate of active oxygen after 48 hours.

[0025] Active oxygen content (%)

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Abstract

The present invention relates to a preparation of percarbonate. Sodium carbonate solution and hydrogen peroxide solution are added dropwise simultaneously into reactor to prepare sodium percarbonate.The process features the addition of silicate to sodium carbonate solution, the addition of one or more of soluble magnesium salt, organic phosphonic acid, ethylenediamine tetraacetic acid and their salt to hydrogen peroxide solution, and the molar ratio between sodium carbonate and hydrogen peroxide of 0.5-1. The improved wet process of preparing sodium percarbonate has high reaction stability, increased active oxygen content in sodium percarbonate, and improved wet and hot stability.

Description

technical field [0001] The invention relates to a preparation method of sodium percarbonate, which belongs to the technical field of preparation of peroxy salts in inorganic chemistry. Background technique [0002] Sodium percarbonate, also known as sodium carbonate peroxide hydrate, has a molecular formula of 2Na 2 CO 3 ·3H 2 o 2 , its theoretical active oxygen content is 15.28%, and its main function is to provide oxygen source. The preparation method of existing sodium percarbonate mainly contains two kinds of wet method and dry method. Dry production is to directly spray hydrogen peroxide onto the surface of sodium carbonate. Although the sodium percarbonate produced by this method has good moisture and thermal stability, the production process is relatively complicated, and the raw material requirements are high, and the product active oxygen The content is relatively low, generally between 12 and 13%. Wet production is a product made by reacti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B15/10
Inventor 陶华西郑龙
Owner 陶华西
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