Product Details
Products Description of 4,4'-Diamino-2,2'-Stilbenedisulfonic Acid CAS#81-11-84,4'-Diamino-2,2'-stilbenedisulfonic acid (CAS# 81-11-8), commonly referred to as Amsonic Acid, is a light yellow crystalline powder. It is mainly employed as a core intermediate in the synthesis of fluorescent whitening agents and optical brighteners for the textile and paper industries. It is a water-soluble compound equipped with amino and sulfonic acid groups on a stilbene backbone, serving as a crucial chemical for the production of dyes and brightening agents.
4,4'-Diamino-2,2'-stilbenedisulfonic acid Chemical Properties
| Melting point | 300 °C |
| Density | 1.4732 (rough estimate) |
| Vapor pressure | 1.3hPa at 25℃ |
| Refractive index | 1.6510 (estimate) |
| Storage temp | Keep in dark place,Inert atmosphere,Room temperature |
| Solubility | Aqueous Base (Slightly) |
| Pka | -1.58±0.50(Predicted) |
| Form | Crystalline Powder |
| Color | Cream to yellow-brown |
| Water Solubility | <0.1 g/100 mL at 23 ºC |
| Merck | 14595 |
| BRN | 629516 |
| Stability | Stable. Combustible. Incompatible with iron, strong oxidizing agents. |
| LogP | -1.7--1.42 at 25℃ |
| CAS DataBase Reference | 81-11-8(CAS DataBase Reference) |
| EPA Substance Registry System | Amsonic acid (81-11-8) |
| Hazard Codes | C,Xn |
| Risk Statements | 34-22-36/37/38-20/21/22 |
| Safety Statements | 24/25-45-36/37/39-26-22 |
| RIDADR | UN 2583 |
| RTECS | WJ6603000 |
| TSCA | Yes |
| HS Code | 29215900 |
| Hazardous Substances Data | 81-11-8(Hazardous Substances Data) |
Product Applications of 4,4'-Diamino-2,2'-Stilbenedisulfonic Acid (CAS#81-11-8)
It is primarily employed in the production of optical brighteners, as well as for the manufacturing of Direct Yellow G and Direct Yellow R dyes. Additionally, it finds wide application in pesticide formulation processes.
Furthermore, it acts as an essential intermediate in the synthesis of dyes and optical brightening agents, providing critical support for the preparation of high-performance related products.
