PRODUCT Properties
| Melting point: | 199°C |
| Boiling point: | 400.53°C (rough estimate) |
| Density | 1.6867 (rough estimate) |
| refractive index | 1.6950 (estimate) |
| storage temp. | 2-8°C |
| pka | -0.33±0.40(Predicted) |
| CAS DataBase Reference | 92-41-1(CAS DataBase Reference) |
| EPA Substance Registry System | 2,7-Naphthalenedisulfonic acid (92-41-1) |
Description and Uses
Intermediate for dyes. The disodium salt of 8 gives 2-hydroxynaphthalene-7-sulfonic acid or 2,7-dihydroxynaphthalene by fusion processes. Sulfonation by oleum gives the 1,3,6-trisulfonic acid, and nitration gives 1-nitronaphthalene-3,6- disulfonic acid. In sulfuric acid solution, the disodium salt of naphthalene-2,7-disulfonic acid undergoes an unusual reaction at the 4-position with 4,40 -bis- (dimethylamino)benzhydrol. The resulting condensation product is oxidized with lead dioxide to give the acid basic dye C.I. Acid Green 16.
Safety
| Symbol(GHS) |  GHS05 |
| Signal word | Danger |
| Hazard statements | H314 |
| Precautionary statements | P310-P260-P280 |
| RIDADR | 1759 |
| HazardClass | 8 |
| PackingGroup | III |
| HS Code | 2904100090 |
