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
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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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