98-71-5
Phenylhydrazine-4-sulfonic acid
CAS: 98-71-5
Molecular Formula: C6H8N2O3S
98-71-5 - Names and Identifiers
98-71-5 - Physico-chemical Properties
| Molecular Formula | C6H8N2O3S |
| Molar Mass | 188.2 |
| Density | 1.366 (estimate) |
| Melting Point | 285°C |
| Boling Point | 500°C (estimate) |
| Water Solubility | It is soluble in water. |
| Solubility | DMSO (Slightly), Water (Slightly) |
| Appearance | Crystallization |
| Color | Off-White to Pale Beige |
| Merck | 4773 |
| pKa | -0.66±0.50(Predicted) |
| Storage Condition | Refrigerator, Under Inert Atmosphere |
| Sensitive | Hygroscopic |
| Refractive Index | 1.6490 (estimate) |
| MDL | MFCD00025097 |
| Physical and Chemical Properties | Needle-like or leafy crystals. Melting point 286 ℃. Soluble in boiling water, slightly soluble in ethanol, ether, slightly soluble in water. |
| Use | Used as a dye intermediate |
98-71-5 - Risk and Safety
| Hazard Symbols | Xi - Irritant |
| Risk Codes | 36/37/38 - Irritating to eyes, respiratory system and skin. |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36/37/39 - Wear suitable protective clothing, gloves and eye/face protection. S60 - This material and its container must be disposed of as hazardous waste. S37 - Wear suitable gloves. |
| UN IDs | 2585 |
| RTECS | DB6900000 |
| TSCA | Yes |
| HS Code | 29280000 |
| Hazard Note | Irritant |
98-71-5 - Introduction
Soluble in boiling water, slightly soluble in water and ethanol.
Last Update：2022-10-16 17:30:27
98-71-5 - Reference Information
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| Use | This product is an intermediate of the dye lemon yellow and is also used as an anti-dyeing agent for ice dyeing dyes. The whitening agent Tinopal WG can be obtained by condensation of phenylhydrazine-4-sulfonic acid with styryl-p-chlorophenone. This whitening agent is mainly used for the whitening of wool, silk and nylon. used as dye intermediate |
| production method | sodium p-aminobenzenesulfonate was used as a raw material, mixed with water and 30% hydrochloric acid, and cooled to 2 °c. Sodium p-aminobenzenesulfonate was then diazotized by the dropwise addition of sodium nitrite solution at 0-5 °c. The above diazo liquid is added to the mixed solution of sodium hydroxide solution and sodium bisulfite, the feeding temperature is controlled at 80-85 ° C., and the pH value is maintained at 6.2-6.7. After the addition, stirring was continued for 1.5h, zinc powder and celite were added, and the mixture was stirred and filtered. The reaction product was treated with acid to obtain phenylhydrazine-4-sulfonic acid. |
Last Update：2024-04-10 22:29:15
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