Acid Black 24
acid black 24 (C.I. 26370)
CAS: 3071-73-6
Molecular Formula: C36H23N5Na2O6S2
Acid Black 24 - Names and Identifiers
| Name | acid black 24 (C.I. 26370) |
| Synonyms | C.I. 26370 Acid Black 24 Acid Black 24 C.I. Acid Black 24 C.I. Acid Black 24 (7CI) acid black 24 (C.I. 26370) C.I. Acid Black 24, disodium salt (8CI) disodium 8-anilino-5-[[4-[(5-sulfonato-1-naphthyl)azo]-1-naphthyl]azo]naphthalene-1-sulfonate disodium 8-(phenylamino)-5-[(E)-{4-[(E)-(5-sulfonatonaphthalen-1-yl)diazenyl]naphthalen-1-yl}diazenyl]naphthalene-1-sulfonate |
| CAS | 3071-73-6 |
| EINECS | 221-343-4 |
| InChI | InChI=1/C36H25N5O6S2.2Na/c42-48(43,44)34-17-7-13-26-27(34)14-6-16-29(26)38-39-30-19-20-31(25-12-5-4-11-24(25)30)40-41-32-21-22-33(37-23-9-2-1-3-10-23)36-28(32)15-8-18-35(36)49(45,46)47;;/h1-22,37H,(H,42,43,44)(H,45,46,47);;/q;2*+1/p-2 |
Acid Black 24 - Physico-chemical Properties
| Molecular Formula | C36H23N5Na2O6S2 |
| Molar Mass | 731.71 |
| Storage Condition | Room Temprature |
| Physical and Chemical Properties | Chemical Properties Acid Black B is blue-black powder. It is soluble in water, the aqueous solution is red-blue to black, and the concentrated hydrochloric acid is green-blue; the concentrated sodium hydroxide solution is jujube-red. Soluble in ethanol is navy blue, soluble in glycol ether, slightly soluble in acetone, insoluble in other organic solvents. It is gray blue to black in concentrated sulfuric acid, dark green and blue after dilution; it is red and brown in concentrated nitric acid and then turns to yellow. When dyeing, the color is darker green when encountering copper ions, and darker when encountering iron ions. |
| Use | Uses weak acid black BR is mainly used for dyeing wool, silk, nylon and direct printing of fabrics. Wool and a variety of fibers with the bath dyeing, silk, nylon color and wool similar, polyester, acrylic, triacetate stained, diacetate slightly stained. Also used for leather coloring. |
Acid Black 24 - Risk and Safety
| WGK Germany | 2 |
| RTECS | AQ4220000 |
Acid Black 24 - Upstream Downstream Industry
Acid Black 24 - Production method
Using lauronic acid, 1-naphthylamine and N-phenyl periacid (N-Phenyl acid) as raw materials, first diazotize lauronic acid, couple with 1-naphthylamine, and then diazotize the coupling product, and couple with N-phenyl periacid to obtain the product. The finished product is salted out, filtered, dried and crushed..
Add 150kg of hydrochloric acid (industrial products) and 300kg of ice to a diazo pot, add 16% lauronic acid solution (containing 104.1kg of lauronic acid) and 30% sodium nitrite solution (containing 33.3kg of NaNO2) below 10 ℃. Add it within 2 hours and continue stirring for 2 hours. Transfer the diazonium solution into a coupling pot, cool to 5 ℃, add 1-naphthylamine hydrochloride solution (prepared by 63kg 1-naphthylamine, 64kg 30% hydrochloric acid and 450L water) within 10min, and continue to stir at 10-12 ℃ for 2h after adding. Then the pH value is gradually adjusted to 9 with 10% liquid alkali in batches.
Transfer the above monoazo compound to a diazo pot, add ice to cool the temperature to 2-3 ℃, add 30% sodium nitrite solution (containing NaNO2 37.4kg), stir well, add 520kg of 22.5% sulfuric acid, maintain 5-8 ℃, stir for 2 hours, then add salt salting out, filter, and beat the filter cake into suspension with 450L ice water.
Add 1000L of water and 128kg N-phenyl periacid into the coupling pot, dissolve at 80-85 ℃, and adjust the pH value to 6 with hydrochloric acid and sodium acetate solution respectively. Dilute with water to 1500L, add the above suspension within 2h, and adjust the pH value to 4.4-4.6 with sodium acetate solution at any time. After adding, continue stirring for 4 hours. Then adjust the pH value to 8-8.2 with liquid alkali. Add salt for salting out, filtering, drying and crushing to obtain a product of about 805kg.
Last Update：2024-04-10 22:29:15
Acid Black 24 - Nature
| EPA chemical information | 1-Naphthalenesulfonic acid, 8-(phenylamino)-5-[[4-[(5-sulfo-1-naphthalenyl)azo]-1-naphthalenyl]azo]-, disodium salt (3071-73-6) |
Last Update：2024-04-09 20:52:54
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View History
Raw Materials for Acid Black 24
Sulfuric acid
Sodium nitrite
Sodium acetate
Methylamine
INDUSTRIAL SALT
2-AMINONAPHTHALENE HYDROCHLORIDE
1-Naphthol-5-sulfonic acid
5-Amino-1-naphthalenesulfonic acid
8-Anilino-1-naphthalenesulfonic acid
1-Naphthylamine
Sodium nitrite
Sodium acetate
Methylamine
INDUSTRIAL SALT
2-AMINONAPHTHALENE HYDROCHLORIDE
1-Naphthol-5-sulfonic acid
5-Amino-1-naphthalenesulfonic acid
8-Anilino-1-naphthalenesulfonic acid
1-Naphthylamine