Dirinal NSK
2-Naphthalene Sulfonic Acid
CAS: 120-18-3
Molecular Formula: C10H8O3S
Dirinal NSK - Names and Identifiers
| Name | 2-Naphthalene Sulfonic Acid |
| Synonyms | Dirinal NSK 2-Sulfonaphthalene 2-Naphthalenesulfoni BETA NAPTHALENE SULPHONATE 2-Naphthalenesulfonic acid 2-Naphthalene Sulfonic Acid Naphthalene-2-sulfonic acid BETA-NAPHTHALENESULFONIC ACID 2-Naphthalenesulfonicacid,tri naphthalene-2-sulfonic acid hydrate 2-Naphthalenesulfonic Acid (β-Naphthalenesulfonic acid) |
| CAS | 120-18-3 |
| EINECS | 204-375-3 |
| InChI | InChI=1/C10H8O3S.H2O/c11-14(12,13)10-6-5-8-3-1-2-4-9(8)7-10;/h1-7H,(H,11,12,13);1H2 |
Dirinal NSK - Physico-chemical Properties
| Molecular Formula | C10H8O3S |
| Molar Mass | 208.23 |
| Density | 1.44 g/cm |
| Melting Point | 124 °C |
| Boling Point | 317.43°C (rough estimate) |
| Flash Point | 271.7°C |
| Water Solubility | Soluble in water. |
| Solubility | water: freely soluble(lit.) |
| Vapor Presure | 2.33Pa at 20℃ |
| Appearance | Crystallization |
| Merck | 6377 |
| pKa | 0.27±0.10(Predicted) |
| Storage Condition | Inert atmosphere,Room Temperature |
| Sensitive | Hygroscopic |
| Refractive Index | 1.4998 (estimate) |
| MDL | MFCD00004089 |
| Physical and Chemical Properties | White to slightly brown leaf-like crystals. Melting point 91 °c (anhydrous),83 °c (trihydrate),124 °c (monohydrate). Soluble in water, alcohol and ether. Deliquescence. |
| Use | For the preparation of 2-naphthol, 1,3,6-naphthalene three sulfonic acid and other intermediates, and formaldehyde condensation can be prepared dispersant NNO |
Dirinal NSK - Risk and Safety
| Risk Codes | R35 - Causes severe burns R34 - Causes burns R11 - Highly Flammable |
| 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. S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) S16 - Keep away from sources of ignition. |
| UN IDs | UN 2583 8/PG 2 |
| WGK Germany | 1 |
| RTECS | QK1225000 |
| TSCA | Yes |
| Hazard Note | Corrosive |
| Hazard Class | 8 |
| Packing Group | III |
Dirinal NSK - Nature
Open Data Verified Data
white to light brown crystals or flakes. Melting point 124-125 °c (91 °c for anhydrous crystals and 83 °c for trihydrate crystals). Deliquescence. Soluble in water, ethanol and ether.
Last Update：2024-01-02 23:10:35
Dirinal NSK - Preparation Method
Open Data Verified Data
obtained by sulfonation of naphthalene.
Last Update：2022-01-01 10:56:15
Dirinal NSK - Use
Open Data Verified Data
This product is used for the preparation of 2 a naphthol, 2 A naphthol sulfonic acid, 2 A naphthylamine sulfonic acid and other dye intermediates, dye diffusion agent.
Last Update：2022-01-01 10:56:15
Dirinal NSK - Safety
Open Data Verified Data
- toxic. Rat oral LD50 440mg/kg. Skin staining was rinsed with water and washed thoroughly with soap.
- brown glass bottle outer fiber board or calcium plastic box liner. Storage in a cool, ventilated warehouse. Keep away from heat source and fire. Isolation storage and transportation with oxidant.
Last Update：2022-01-01 10:56:15
Dirinal NSK - Reference Information
| LogP | -0.944 at 23℃ |
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| use | 2-naphthalenesulfonic acid is an important chemical intermediate, widely used in dye, textile and leather industries. It is used to produce dye intermediates such as 2-naphthol, 2-naphthol sulfonic acid, 1,3,6-naphthyl trisulfonic acid, 2-naphthyl amine sulfonic acid, etc. Dehydrogenation catalyst. Condensation with formaldehyde can produce diffuser N (diffuser NNO). 2-Naphthalenesulfonic acid is also used as a biochemical reagent and experimental reagent for the determination of peptone and protein. |
| Production method | is obtained by sulfonation of naphthalene. Naphthalene is used as raw material, 98% sulfuric acid is used as sulfonating agent, and sulfonated at 160-166 ℃. In the sulfonation process, a small amount of α-naphthalene sulfonic acid by-products are generated. By heating, the unstable α-naphthalene sulfonic acid can be hydrolyzed at 140-150 ℃ to remove the sulfonic acid group and become naphthalene and sulfuric acid. Water vapor can blow out naphthalene. When hydrolyzing naphthalene, a small amount of lye should be added to neutralize part of the sulfuric acid. It also reacts with naphthalenesulfonic acid to form β-naphthalenesulfonate sodium salt crystals, which are filtered to obtain the finished product of 2-naphthalenesulfonic acid. |
Last Update：2024-04-09 15:16:47
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