Prussian blue
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Prussian blue
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CAS No:
12240-15-2
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Chemical Name:
Prussian blue
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Synonyms:
C.I. Pigment Blue 27;Paris blue;C.I. 77510;Iron blue;Berlin blue;Chinese blue;Prussian blue;Milori Blue HCB;Ariabel Dark Blue 300308;Radiogardase;Milori Blue 690;Ammonium Prussian blue;Manox Iron Blue;Pigment Blue 27;Ferric blue;N 650 (pigment);N 650;Milori Blue 671;Berliner Blue;Blue HO 208;Milori Blue 690BB;Manox Blue 4050;Manox 4050;Manox Easisperse 154;Easisperse 154;Unipure Blue LC 685;Milori Blue 905;Milori Blue 660PA;Panalite Blue IPB;Konjo;WD-FB 40;Milori Blue FX 9050;CI 77510 blue;12227-90-6;56110-51-1;82197-54-4;445423-98-3
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CAS No:
Prussian blue Use and Manufacturing
The reaction equation is as follows: white slurry 2FeSO4+xK4Fe(CN)6→2K2SO4+Fe2Fe(CN)6·(x-1)K4Fe(CN)6 white slurry oxidation 6FeK2Fe(CN)6+3H2SO4+KClO3→6FeKFe(CN) 6+KCl+3H2O+3K2SO4 potassium iron blue formula: K4Fe(CN)6·3H2O 100kg, FeSO4·7H2O 76kg, H2SO4 40kg, KClO3 5.5kg ammonium iron blue formula: Na4Fe(CN)6·10H2O 100kg, FeSO4·7H2O 66kg , 35kg of H2SO4, 5kg of KClO3, 33kg of (NH4)2SO2. Potassium ferrocyanide or sodium is dissolved in water to make a concentration of 100g/L, and heated to 70°C with steam. The ferrous sulfate is also formulated into a 100g/L solution, and the pH value is adjusted to about 1.5 with sulfuric acid. When preparing ammonium iron blue, ammonium sulfate is dissolved in ferrous sulfate. White pulp formation and hot cooking. The ferrous sulfate solution was added at 70°C with stirring for 10-15 minutes. After the ferrous sulfate was added, the temperature was raised to above 95°C immediately, and the filtrate of the white slurry was filtered to verify the remaining amount of ferrous sulfate. Under normal circumstances, the remaining subsulfuric acid in the mother liquor should be 1.5-2g/L. If this amount is exceeded, potassium or sodium ferrocyanide should be added; if insufficient, ferrous sulfate should be added. Pickling and oxidation of white pulp. After the white slurry is formed, the diluted sulfuric acid is added for acid cooking, and the acid cooking temperature is above 95°C and maintained for 2 hours. The high temperature and long time of pickling make the iron blue have stronger coloring power, softer texture and better brightness. At the end of the acid cooking, dilute the white slurry to 1.8m3 with cold water, and adjust the temperature to 70°C. Slowly add the potassium chlorate solution dissolved in water with a concentration of 10% at 70°C within 20min. After the addition, continue at 70°C Oxidation for 3h. The end point of oxidation is marked by the absence of bivalent iron in the mother liquor. After the iron blue is made, the water-soluble salts must be thoroughly washed to ensure the dispersibility, durability and other performance of the product. You can use the method of first filtering the frame and filtering and then washing with water. After filtering and washing, the iron blue is dried at 60～70℃ and crushed again. It can also finish pigments and improve their performance. The simplest finished product is a surfactant treatment. Such as zinc naphthenate. Dilute the zinc naphthenate with solvent gasoline and directly add it to the iron blue slurry that has not been washed. Stir thoroughly to make the zinc naphthenate adsorb on the iron blue particles, and then filter and wash. The role of zinc naphthenate is not only to improve the lipophilicity of iron blue and easy to disperse, but also to prevent the discoloration of iron blue after storage in paint.
Prussian blue is used to detect the presence of iron in histological tissue sections and biopsy specimens
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