Sodium hydrosulfite composition and preparation method thereof
A technology of composition and sodium hydrosulfite, which is applied in dyeing, textiles and papermaking, etc. It can solve the problems of high pollution content in sewage, cumbersome recycling, and reduced reduction ability, and achieves obvious coating effect, low material cost, and enhanced stability sexual effect
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[0037] The present invention also provides a kind of preparation method of hydrosulfite composition, and this method comprises the following steps:
[0038] (1) After filtering the sodium dithionite after alcohol analysis, add an inorganic salt coating agent, fully mix;
[0039] (2) uniformly spray the organic solvent solution of the polymer coating agent on the mixture obtained in the above step (1), and then dry;
[0040] All the above steps were carried out under the protection of nitrogen.
[0041] According to the method provided by the present invention, the concentration of sodium dithionite in the sodium dithionite after alcohol analysis is preferably 85-90% by weight, so as to ensure the coating effect of the inorganic salt coating agent and the polymer coating agent.
[0042] According to the method provided by the present invention, in the organic solvent solution of the polymer coating agent, the concentration of the polymer coating agent is not limited, as long a...
Embodiment 1
[0055] The sodium dithionite (average particle diameter is 400 μm) that is 85% by weight after the concentration of the dried 900kg alcohol analysis is dropped into the mixing pot, starts to stir, and drops into 4.5kg pulverized as the inorganic coating agent, the average particle diameter is 150 μm The sodium sulfate of sodium sulfate and 0.9kg pulverized, the sodium chloride that the average particle diameter is 150 μ m, mix homogeneously; Then the methanol solution (0.8kg Polyethylene glycol and 0.2kg methanol) are uniformly sprayed (atomized) on the homogeneously mixed mixture, after blending uniformly, dried at 60° C. to obtain a hydrosulfite composition with an average particle diameter of 1 mm.
Embodiment 2
[0057] 850kg of dry 850kg alcohol analysis after the concentration is 90% by weight of sodium dithionite (average particle diameter is 400 μm) into the blending pot, start stirring, drop into 0.1kg of crushed good as stabilizer, the average particle diameter is 500 μm Magnesium chloride, mix uniformly; Add 100kg of crushed sodium bicarbonate with an average particle diameter of 400 μm as a granulating agent, mix uniformly; Add 4.07 kg of crushed inorganic salt coating agent with an average particle diameter of 150 μm Sodium sulfate and 0.81 kg of crushed sodium chloride with an average particle size of 150 μm are mixed evenly; then 0.1 kg of sodium silicate with an average particle size of 50 μm is added as an anti-friction agent, mixed evenly, and then sprayed The methanol solution (0.8kg polyvinyl alcohol and 0.2kg methyl alcohol) of polyvinyl alcohol as the weight-average molecular weight of polymer coating agent is 8000 and is evenly sprayed (atomized) on the mixture that h...
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