121-03-9
4-nitrotoluene-2-sulphonic acid
CAS: 121-03-9
Molecular Formula: C7H7NO5S
121-03-9 - Names and Identifiers
| Name | 4-nitrotoluene-2-sulphonic acid |
| Synonyms | 5-nitro-o-toluenesulfonicaci 2-toluenesulfonicacid,5-nitro 4-Nitro-o-toluenesulfonicacid 5-nitro-o-toluenesulfonicacid 4-nitrotoluene-2-sulphonicacid 4-Nitrotoluene-2-sulfonic acid 4-nitrotoluene-2-sulphonic acid 2-Methyl-5-nitrobenzenesalfonicacid 2-methyl-5-nitro-benzenesulfonicaci 5-nitro-2-methylbenzenesulfonicacid 2-methyl-4-nitrobenzenesulfonic acid 2-Methyl-5-nitrobenzenesulfonic acid |
| CAS | 121-03-9 |
| EINECS | 204-445-3 |
| InChI | InChI=1/C7H7NO5S/c1-5-4-6(8(9)10)2-3-7(5)14(11,12)13/h2-4H,1H3,(H,11,12,13) |
121-03-9 - Physico-chemical Properties
| Molecular Formula | C7H7NO5S |
| Molar Mass | 217.2 |
| Density | 1.6040 (rough estimate) |
| Melting Point | 135°C |
| Boling Point | 500°C (rough estimate) |
| Water Solubility | 667g/L at 23℃ |
| Solubility | Methanol (Slightly), Water (Slightly) |
| Vapor Presure | 0Pa at 20℃ |
| Appearance | White crystal |
| Color | Very Dark Brown |
| pKa | -1.14±0.33(Predicted) |
| Storage Condition | Sealed in dry,Room Temperature |
| Refractive Index | 1.6100 (estimate) |
| MDL | MFCD00024914 |
| Physical and Chemical Properties | Trait plate-like crystals (recrystallized from water). melting point 133.5 ℃ solubility: soluble in ethanol, ether, chloroform. |
| Use | As an intermediate of stilbene-based direct dyes |
121-03-9 - Risk and Safety
| Hazard Symbols | Xn - Harmful |
| Risk Codes | R34 - Causes burns R41 - Risk of serious damage to eyes R43 - May cause sensitization by skin contact R36 - Irritating to the eyes R22 - Harmful if swallowed |
| 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. S39 - Wear eye / face protection. S36/37 - Wear suitable protective clothing and gloves. |
| UN IDs | 3261 |
| RTECS | DB7175000 |
| Hazard Class | 8 |
| Packing Group | III |
121-03-9 - Reference Information
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| overview | 4-nitrotoluene -2-sulfonic acid self-polycondensation dyes can be divided into dyes with colors ranging from yellow to red according to the degree of polycondensation. among them, the most widely used direct yellow 11 dye is a strong yellow dye, especially suitable for dyeing fibers, leather, etc. |
| use | used as an intermediate for stilbene direct dyes this product is a fluorescent whitening agent and a dye intermediate. |
| Production method | It is obtained by sulfonation of p-nitrotoluene. The molten p-nitrotoluene is sucked into the glass-lined reaction pot, 980kg of 20% fuming sulfuric acid is added, and the temperature is controlled not to exceed 90 ℃. After adding, raise the temperature to 105-110 ℃ and keep the temperature for 1h. After the reaction is completed, cool to 70°C and dilute with water. Stir for 30min below 100 ℃, cool to 25 ℃, adjust acidity and filter, the filter cake is 2-methyl -5-nitrobenzene sulfonic acid. |
| toxic substance data | information provided by: pubchem.ncbi.nlm.nih.gov (external link) |
Last Update：2024-04-09 21:01:54
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