Naphthalene-2,7-disulfonic acid
- CAS No.
- 92-41-1
- Chemical Name:
- Naphthalene-2,7-disulfonic acid
- Synonyms
- Ebert-Merz α-acid;naphthalene-2,7-disulfonicaci;3,6-Naphthalenedisulfonic acid;2,7-NAPHTHALENE DISULFONIC ACID;naphthalene-2,7-disulfonic acid;naphthalene-2,7-disulphonic acid
- CBNumber:
- CB5297140
- Molecular Formula:
- C10H8O6S2
- Molecular Weight:
- 288.3
- MOL File:
- 92-41-1.mol
- MSDS File:
- SDS
- Modify Date:
- 2023/10/30 16:55:24
| 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) |
SAFETY
Risk and Safety Statements
| Symbol(GHS) |  GHS05 |
|---|---|
| Signal word | Danger |
| Hazard statements | H314 |
| Precautionary statements | P310-P260-P280 |
| RIDADR | 1759 |
| HazardClass | 8 |
| PackingGroup | III |
| HS Code | 2904100090 |
Naphthalene-2,7-disulfonic acid Chemical Properties,Uses,Production
Chemical Properties
White, crystalline solid.Soluble in water. Combustible. Naphthalene-2,7-disulfonic acid [92- 41-1]. C10H8O6S2, Mr 288.28; the sodium salt of Naphthalene-2,7-disulfonic acid is much more soluble than that of the 2,6- isomer but can be isolated and purified by precipitation of the calcium salt at lower temperature followed by recrystallization.
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.
Definition
ChEBI: A naphthalenesulfonic acid in which the sulfo groups are attached to positions 2 and 7 of the naphthalene ring.
Production Methods
The 2,7-disulfonic acid is always the main product of high-temperature sulfonation of naphthalene, but at 160 C it converts slowly to an equilibrium mixture containing ca. 30 % of the 2,6-isomer. Crystallization of the pure product from conventional sulfonation is difficult, and alternative processes, (for example, reaction of naphthalene vapor with sulfur trioxide in the gas phase at 220 C) are said to give a purer product.
Purification Methods
Crystallise the acid from conc HCl. The disulfonamide has m 273o (from EtOH). [Beilstein 11 II 119, 11 III 463.]
Naphthalene-2,7-disulfonic acid Preparation Products And Raw materials
Raw materials
Preparation Products
| Supplier | Tel | Country | ProdList | Advantage | Inquiry |
|---|---|---|---|---|---|
| Anax Laboratories | +91 (40) 6464-2010 | New Delhi, India | 177 | 0 | Inquiry |
| CHEMSWORTH | +91-261-2397244 | New Delhi, India | 6707 | 30 | Inquiry |
| career henan chemical co | +86-0371-86658258 +8613203830695 | China | 29826 | 58 | Inquiry |
| Hefei TNJ Chemical Industry Co.,Ltd. | 0551-65418671 | China | 34571 | 58 | Inquiry |
| Dayang Chem (Hangzhou) Co.,Ltd. | 571-88938639 +8617705817739 | China | 52861 | 58 | Inquiry |
| Henan Alfa Chemical Co., Ltd | +8618339805032 | China | 13140 | 58 | Inquiry |
| Zhengzhou Lingzhiyue Technology Co., Ltd | +86-0371-55074660 +86-13783527580 | China | 3152 | 58 | Inquiry |
| Hebei Weibang Biotechnology Co., Ltd | +8615350571055 | China | 5251 | 58 | Inquiry |
| Shanghai Haohong Scientific Co., Ltd. | 400-400-8210725 | China | 39994 | 58 | Inquiry |
| Shanghai Rolead Chemical Technology Co., Ltd. | 021-69992220 13701886816 | China | 4756 | 50 | Inquiry |
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