Direct Red 23
direct red 23 (C.I. 29160)
CAS: 3441-14-3
Molecular Formula: C35H25N7Na2O10S2
Direct Red 23 - Names and Identifiers
| Name | direct red 23 (C.I. 29160) |
| Synonyms | C.I. 29160 Scarlet 4BS Direct Red 23 Direct Red 23 C.I. Direct Red 23 C.I. Direct Red 23 (VAN) direct red 23 (C.I. 29160) C.I. Direct Red 23, disodium salt (3E)-3-{2-[4-(acetylamino)phenyl]hydrazinylidene}-4-oxo-7-({[(6E)-5-oxo-6-(2-phenylhydrazinylidene)-7-sulfo-5,6-dihydronaphthalen-2-yl]carbamoyl}amino)-3,4-dihydronaphthalene-2-sulfonic acid disodium 4-oxo-3-(2-{4-[(2-oxoethyl)amino]phenyl}hydrazinylidene)-6-({[(6E)-5-oxo-6-(2-phenylhydrazinylidene)-7-sulfonato-5,6-dihydronaphthalen-2-yl]carbamoyl}amino)-3,4-dihydronaphthalene-2-sulfonate |
| CAS | 3441-14-3 |
| EINECS | 222-348-4 |
| InChI | InChI=1/C35H27N7O10S2/c1-19(43)36-22-7-9-24(10-8-22)40-42-32-30(54(50,51)52)18-21-16-26(12-14-28(21)34(32)45)38-35(46)37-25-11-13-27-20(15-25)17-29(53(47,48)49)31(33(27)44)41-39-23-5-3-2-4-6-23/h2-18,39-40H,1H3,(H,36,43)(H2,37,38,46)(H,47,48,49)(H,50,51,52)/b41-31-,42-32- |
Direct Red 23 - Physico-chemical Properties
| Molecular Formula | C35H25N7Na2O10S2 |
| Molar Mass | 813.72 |
| Density | 1.606g/cm3 |
| Storage Condition | Room Temprature |
| Refractive Index | 1.745 |
| Physical and Chemical Properties | Chemical properties purplish red powder. The water solubility is medium, and it is bright red when dissolved in water. The aqueous solution is added with dilute sulfuric acid to turn light blue, and concentrated hydrochloric acid to produce wine red precipitate, and concentrated alkali to turn red, light, orange and brown. Slightly soluble in ethanol is orange, insoluble in acetone. It is red to magenta in concentrated sulfuric acid, and turns to brown-orange after dilution; orange-yellow precipitate is produced in concentrated nitric acid; it is insoluble in concentrated lye; it is red in concentrated ammonia water. When dyeing, the color light of copper ions becomes dark, and the color light of iron ions does not change. |
| Use | Mainly used for cotton, viscose, hemp fiber fabric dyeing and printing, can also be used for silk, wool dyeing, also can be used for paper, leather dyeing, and for the manufacture of lake pigments. In addition to the separate application of dye Red, Red (yellow light red) color, also used with yellow, orange, red, brown and other dyes. After dyeing with urea-formaldehyde resin finishing or fixing agent Y treatment, color light based benzene unchanged, such as with fixing agent M treatment, color light obviously turn blue. |
Direct Red 23 - Risk and Safety
| WGK Germany | 2 |
| RTECS | QK1237500 |
Direct Red 23 - Upstream Downstream Industry
Direct Red 23 - Nature
| color index | 29160 |
| EPA chemical information | C. I. Direct Red 23, disodium salt (3441-14-3) |
Last Update：2024-04-10 22:29:15
Direct Red 23 - Uses and synthesis methods
production method
1. Aniline and p-aminoacetylbenzene are diazotized, coupled with scarlet acid, and then salted out, filtered and dried. Raw material consumption (kg/t) aniline 55 scarlet acid (100%) 330 paracetamilide (100%) 95 hydrochloric acid (31%) 380 sodium nitrite (100%) 110 soda ash (industrial) 170 refined salt 210 sodium hydroxide (100%) 85
2. using paracetamilide, scarlet acid and bis-j acid (5,5 '-dihydroxy -7,7'-disulfonic acid -2,2 '-dinaphthylamine) as raw materials, paracetamilide is first diazotized, then coupled with the mixture of scarlet acid and bis-j acid in the presence of soda ash to obtain the product, which is salted out, filtered..
3. using scarlet acid, aniline and paracetamidine as raw materials, aniline and paracetamidine are first diazotized, then coupled with scarlet acid to obtain the product, which is salted out, filtered, dried and crushed to obtain the finished product..
P> add clear water and paracetamidine to the diazo pot, stir and cool to about 0 ℃, add aniline and hydrochloric acid, add sodium nitrite solution under stirring, keep the reaction solution at 0-5 ℃, and add a small amount of hydrochloric acid when the reaction is completely clear and clear diazonium salt solution.add clear water, scarlet acid, soda ash and 30% liquid alkali into the coupling pot, and stir to dissolve them all (water can be added appropriately to ensure scarlet acid is dissolved). Cool to 4-6 ℃, add 1/2 amount of diazonium salt solution, add salt, then slowly add another 1/2 amount of diazonium salt solution, control the temperature 5-10 ℃,pH = 7-7.5, until the reaction is complete (spot test with H acid). Then raise the temperature to 60 ℃, add salt to salt out, and raise the temperature to 70 ℃, add water to dilute, filter while hot, dry and crush to obtain the finished product.
Last Update：2024-04-09 19:04:55
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View History
Raw Materials for Direct Red 23
Sodium nitrite
Sodium chloride
4'-Aminoacetanilide
6,6'-Ureylene-bis(1-naphthol-3-sulfonic acid)
5,5'-Dihydroxy-2,2'-dinaphthylamine-7,7'-disulphonic acid
6,6'-Ureylene-bis(1-naphthol-3-sulfonic acid)
Aniline
4'-Aminoacetanilide
Sodium chloride
4'-Aminoacetanilide
6,6'-Ureylene-bis(1-naphthol-3-sulfonic acid)
5,5'-Dihydroxy-2,2'-dinaphthylamine-7,7'-disulphonic acid
6,6'-Ureylene-bis(1-naphthol-3-sulfonic acid)
Aniline
4'-Aminoacetanilide