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Molecular formula : C22H14N4Na2O7S2
MW : 556.490
CAS No. :5413-75-2
nature : yellow red powder. Water-soluble red solution, and can be soluble in alcohol-fibrinolytic difficult to dissolve in acetone, do not dissolve in organic solvents. Case of concentrated sulfuric acid was red purple, red diluted Generation brown precipitation; Case of concentrated nitric acid was blue, olive-brown turn into orange. Aqueous increase its production concentrated hydrochloric acid precipitation dark-red brown, plus generate dark brown liquid sodium hydroxide precipitation. Evening stained copper, iron colors are dark. Discharge good.
preparation methods : by right-azobenzene diazotization, with salt coupling G, Salt derived. 1. Diazotization to 240kg of benzidine hydrochloride joined 1200L water, add 30% hydrochloric acid 200kg. Mixing 4h, to 8 ° C cold in the airspace from surface to add 30% sodium nitrite solution (% 100% 80 kg) temperature does not exceed 15 ° C to nitrite-end at the excessive and maintain one hour, the cold to 5 ° C below, filtering, it can Residue and the filtrate 28% by volume and salt, stirring 20min, filter, filter cake and ice water to dilute 3000L, the temperature of 0-5 ° C. 2. Coupling the 400,000-500,000 barrels 1500L, ranged 160kg, stirring, join G-salt 270kg, it all dissolved. Cold to 5 ° C for 3 hours and add the above diazo solution, a temperature not exceeding 12 ° C. Albert increases, the pH should be measured 9, G excessive salt. 6h after mixing, heating to 60 ° C, 9% by volume and salt, filtration, drying, in the original dye 680kg. After that standardized products dye 1000. G salt (100%) 280 Sodium Nitrite (98%) 82 of benzidine (100%) 248 hydrochloride (31%) 196 sodium carbonate (98%) 157 Sodium Sulfate 160
purposes : for hair dyeing silk fabric, used for paper and the leather dyeing. Can also be used for plastic, wood, spices, medicine, Split and cement rendering. Also used in the manufacture of ink. Their heavy metal salts for paint.
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