product information:

product information

Type: Acid Dye, Acid Blue Dye

Product Name: Acid Blue 317, Acid Blue SG
Color rendering index: 317
CAS#: 71872-19-0

EINECS: 264-966-7
Molecular formula: C32H21N5Na2O6S2

Production Method:

Using m-aminobenzenesulfonic acid, 1-naphthylamine and N-phenylperacid (8-anilino-1-naphthalenesulfonic acid) as raw materials, first diazotize m-aminobenzenesulfonic acid, and then combine with 1-naphthylamine Coupling; Then the coupling product is diazotized and coupled with phenyl peracid to obtain the product. After neutralization, salting out, filtration and drying, the finished product can be obtained. . Add 600L of water and sodium m-aminobenzenesulfonate solution (containing 78 kg of m-aminobenzenesulfonic acid) into the diazonium pot, and cool to 3-5°C. Then 173kg of 30% hydrochloric acid was added, and m-aminobenzenesulfonic acid was separated out, diluted with water to 1500L, added with 30% sodium nitrite solution (containing NaNO2 31.05kg), and continued to stir for 1h until clarification. Transfer to the coupling pot, add 1-naphthylamine hydrochloride solution (containing 66.3kg of 1-naphthylamine) under stirring, add it within 10Chemicalbookmin, keep it below 10°C, continue stirring for 1h, and gradually adjust the pH with 15% liquid alkali Adjusted to 9, the monoazo compound was obtained. Cool the above monoazo compound with ice to 4°C, add 30% sodium nitrite solution (containing 41.5kg of NaNO2), add 544kg of 22.5% sulfuric acid under stirring, maintain 7-8°C, stir for 3h, and filter. The filter cake was whipped with ice water to form a 1500L suspension. Add 1500L phenyl peracid aqueous solution (containing 139.5 kg of phenyl peracid) to the coupling pot, cool down to 12°C, add the above suspension, and add sodium acetate solution (concentration of about 70% aqueous solution) at the same time, control within 2 hours after adding The pH value is between 4-4.2. Continue stirring at 11-12°C for 4 hours, and adjust the pH to 8-8.5 with 15% liquid caustic soda. Raise the temperature to 90°C, add salt and salt out, press filter, dry, and pulverize to obtain about 390 kg of the product.

Chemical properties:

Green light black powder. Soluble in water, the aqueous solution is purple, adding concentrated hydrochloric acid is purple; adding concentrated sodium hydroxide solution is purple. Soluble in ethanol, it is purple blue, also soluble in ethylene glycol ether, slightly soluble in acetone, insoluble in other organic solvents. It is dark green-blue in concentrated sulfuric acid, and becomes dark green-blue to gray-purple after dilution; it is orange-brown in concentrated nitric acid. When encountering copper ions, the color changes slightly; when encountering iron ions, the color becomes lighter.