4-aminobenzene-1,3-disulphonic acid
4-aminobenzene-1,3-disulphonic acid
CAS: 137-51-9
Molecular Formula: C6H7NO6S2
4-aminobenzene-1,3-disulphonic acid - Names and Identifiers
| Name | 4-aminobenzene-1,3-disulphonic acid |
| Synonyms | ANILINE-2,4-DISULFONIC ACID Aniline-2,4-disulfonic Acid ANILINE-2,4-DISULPHONIC ACID 4-amino-3-benzenedisulfonicacid 3-Benzenedisulfonicacid,4-amino-1 4-Amino-1,3-benzenedisulfonic acid 4-Aminobenzene-1,3-Disulfonic Acid 4-Amino-1,3-Benzenedisulfonic Acid 4-aminobenzene-1,3-disulphonic acid 4-azanylbenzene-1,3-disulfonic acid |
| CAS | 137-51-9 |
| EINECS | 205-299-3 |
| InChI | InChI=1/C6H7NO6S2/c7-5-2-1-4(14(8,9)10)3-6(5)15(11,12)13/h1-3H,7H2,(H,8,9,10)(H,11,12,13) |
4-aminobenzene-1,3-disulphonic acid - Physico-chemical Properties
| Molecular Formula | C6H7NO6S2 |
| Molar Mass | 253.25 |
| Density | 1.844±0.06 g/cm3(Predicted) |
| Melting Point | >259°C (dec.) |
| Boling Point | 497.45℃[at 101 325 Pa] |
| Water Solubility | 4.3g/L at 21℃ |
| Solubility | Aqueous Acid (Slightly), DMSO (Slightly), Methanol (Slightly), Water (Slightly) |
| Vapor Presure | 0Pa at 25℃ |
| Appearance | White powder |
| Color | White to Grey |
| pKa | -0.93±0.48(Predicted) |
| Storage Condition | Keep in dark place,Sealed in dry,Room Temperature |
| Stability | Hygroscopic |
| Refractive Index | 1.666 |
| Physical and Chemical Properties | White to gray needle-like crystals, dihydrate melting point of 120 deg C, soluble in alcohol and water, temperature above 120 deg C decomposition. |
4-aminobenzene-1,3-disulphonic acid - Reference Information
| LogP | -0.959 at 21℃ |
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| use | can be used as dye intermediate. |
| Production method | It is obtained by sulfonation of p-aminobenzenesulfonic acid through fuming sulfuric acid. 20% fuming sulfuric acid is added into the sulfonation pot, dry p-aminobenzenesulfonic acid is slowly added under stirring, the temperature is controlled at 50 ℃ during feeding, stirring for 20min after feeding, then heating to 60 ℃, keeping warm for 1h, then raising to 80 ℃, keeping warm for 1h, then raising to 100 ℃, keeping warm for 1h, finally raising to 128 ℃, keeping warm for 5h, sampling and verification (taking 2ml of sample, diluted in 40ml of distilled water, shaking to make it fully soluble, to obtain a clear solution). Stir at 128 ℃ for 3h, then cool to 75 ℃ and discharge, the yield is 98%. |
Last Update：2024-04-10 22:29:15
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