Process for preparing sodium percarbonate
A technology of sodium percarbonate and hydrated sodium carbonate, which is applied in the preparation of carboxylic acid amides, chemical instruments and methods, and the preparation of organic compounds, etc. It can solve the problems of poor wet stability of crystallized products, pollution of waste liquid discharge water, and insufficient reaction. , to achieve the effects of environmental protection, heat load reduction and consumption reduction
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Embodiment 1
[0027] Take 840 grams of mother liquor and import it into the pulping kettle, start the shear emulsification machine, add 280 grams of light anhydrous sodium carbonate, 80 grams of sodium chloride and 3 grams of sodium silicate; shear and emulsify for 20 minutes, and generate sodium carbonate monohydrate suspension Liquid, suspension temperature is controlled at 38~43 ℃; Contain 840 grams of 6.0% sodium carbonate mother liquor in this reaction solution, 280 grams of sodium carbonate, 80 grams of sodium chloride and 3 grams of sodium silicate. 440 g concentration of 27.5% aqueous hydrogen peroxide is introduced into the hydrogen peroxide tank, and 4 g of aminotrimethylene phosphonic acid (ATMP), 1 g of disodium edetate, and 2 g of magnesium sulfate are added, and stirred evenly. Get mother liquor 250 grams again simultaneously, add average particle size and be 3 grams of sodium percarbonate of 100 μ m as crystal seed.
[0028] Then, import the hydrated sodium carbonate suspensi...
Embodiment 2
[0030] Method step is identical with embodiment 1, and different processing conditions are as follows: first step reaction, 840 grams of mother liquors of sodium carbonate content 5%, add anhydrous sodium carbonate 280 grams, sodium chloride 80 grams, reaction time 25 minutes, temperature of reaction 25 ~30 ℃, generate sodium carbonate decahydrate suspension; The second step reaction, concentration is 450 grams of aqueous hydrogen peroxide solution of 27.5%, 1 gram of seed crystals, aqueous hydrogen peroxide feed rate 430ml / h, sodium carbonate hydrate suspension feed intake Speed 800ml / h, feed reaction time 60 minutes, reaction temperature 22~23 ℃, obtained 410 grams of sodium percarbonate finished products.
Embodiment 3
[0032] The method steps are the same as in Example 1, and the different process conditions are as follows: the first step reaction, containing 840 grams of sodium carbonate 7% mother liquor, adding 280 grams of anhydrous sodium carbonate, 60 grams of sodium chloride, hydration reaction time 25 minutes, hydration reaction temperature 25~30 ℃, generate sodium carbonate decahydrate suspension; The second step reaction, concentration is 330 grams of aqueous hydrogen peroxide solution of 35%, 5 grams of seed crystals, the feeding speed of sodium carbonate hydrate suspension is 960ml / h, aqueous hydrogen peroxide solution The feeding rate is 400ml / h, the feeding crystallization reaction time is 50 minutes, and the reaction temperature is 22-23° C. to obtain 395 grams of sodium percarbonate finished product.
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