1 Physical Properties
Appearance: white powder, flake or granular material.
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Nature
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Chemical Formula
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Na 2 HPO 4
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Molar mass
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(Anhydrous) 141.96 g / mol
(Dihydrate) 177.99 g / mol (Seven water) 268.07 g / mol (Twelve water) 358.14 g · mol ⁻ ¹ |
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Exterior
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White crystals
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Density
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1.52 g / cm
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Solubility (in water)
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77 g · L ~ 0.54 M
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Melting point: 34.6 ℃
2 Uses
Disodium hydrogen phosphate can be used to produce citric acid, water softener, fabric weight agents, flame retardants, and for glaze, welding, pharmaceutical, paint, food industry and other phosphate preparation for industrial water treatment agent, dyeing detergents, quality improver, neutralizers, antibiotics train agents, biological treatment agent of food quality improver. [1]
3 Precautions
Avoid contact with skin and eyes. Irritating to eyes, respiratory system and skin.
Packing and storage
Lined with polyethylene plastic bags, jackets plastic woven bag, net weight 50kg.
Preparation Method 4
Spray drying method disodium hydrogen twelve water bath heated to dissolve dissolved, add a small amount of industrial phosphoric acid, adjust pH8.8-9.0, the solution temperature 80-85 ℃, with metering pump to the tank via spray atomization, fog selection of second-rate type of steam-driven nozzle, steam pressure 0.15-0.3 Mpa, atomizer steam flow guide angle with the horizontal 30 °, the vapor-liquid ratio (0.4 to 5): 1. Heat oven gas inlet temperature of 650-750 ℃. Cocurrent drying may also be countercurrent drying. As countercurrent drying, inlet temperature 620-650 ℃, outlet temperature 140 ~ 150 ℃. Finished size is about 90μm 60% moisture content <1%. Anhydrous disodium hydrogen phosphate prepared products. .