2-Aminonaphthalene-1-sulfonic acid
- CAS No.
- 81-16-3
- Chemical Name:
- 2-Aminonaphthalene-1-sulfonic acid
- Synonyms
- Nsc5523;TOBIAS ACI;TOBIAS ACID;TOBIAC ACID;SUPER J ACID;Tobiasacid,98%;Wln: L66J bswq cz;kyselinatobiasova;TOBIAS ACID 97 PCT;Kyselina tobiasova
- CBNumber:
- CB1128987
- Molecular Formula:
- C10H9NO3S
- Molecular Weight:
- 223.25
- MOL File:
- 81-16-3.mol
- MSDS File:
- SDS
- Modify Date:
- 2024/7/30 14:17:11
| Melting point | 180 °C |
|---|---|
| Boiling point | 220°C (rough estimate) |
| Density | 1.3588 (rough estimate) |
| refractive index | 1.5250 (estimate) |
| storage temp. | -20°C Freezer, Under inert atmosphere |
| solubility | DMSO (Slightly), Methanol (Slightly, Heated), Water (Slightly, Heated) |
| form | Solid |
| pka | pK1: 2.35 (25°C) |
| color | White to Off-White |
| Water Solubility | 4.083g/L(20 ºC) |
| Merck | 14,6406 |
| BRN | 613084 |
| CAS DataBase Reference | 81-16-3(CAS DataBase Reference) |
| NIST Chemistry Reference | 2-Naphthylamine-1-sulfonic acid(81-16-3) |
| EPA Substance Registry System | 2-Amino-1-naphthalenesulfonic acid (81-16-3) |
SAFETY
Risk and Safety Statements
| Symbol(GHS) |  GHS07 |
|||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Signal word | Warning | |||||||||
| Hazard statements | H320-H319 | |||||||||
| Precautionary statements | P264-P305+P351+P338+P337+P313-P280i-P305+P351+P338-P337+P313 | |||||||||
| Risk Statements | 36/37/38-40 | |||||||||
| Safety Statements | 26-36/37/39 | |||||||||
| RIDADR | 2585 | |||||||||
| WGK Germany | 1 | |||||||||
| RTECS | QK1250000 | |||||||||
| TSCA | Yes | |||||||||
| HS Code | 2921.45.9010 | |||||||||
| HazardClass | 8 | |||||||||
| PackingGroup | III | |||||||||
| NFPA 704 |
|
2-Aminonaphthalene-1-sulfonic acid price More Price(4)
| Manufacturer | Product number | Product description | CAS number | Packaging | Price | Updated | Buy |
|---|---|---|---|---|---|---|---|
| TCI Chemicals (India) | A0343 | 2-Amino-1-naphthalenesulfonic Acid | 81-16-3 | 25G | ₹2600 | 2022-05-26 | Buy |
| ALFA India | ALF-A18644-36 | 2-Aminonaphthalene-1-sulfonic acid, 98% | 81-16-3 | 500g | ₹4781 | 2022-05-26 | Buy |
| TCI Chemicals (India) | A0343 | 2-Amino-1-naphthalenesulfonic Acid | 81-16-3 | 500G | ₹28000 | 2022-05-26 | Buy |
| ALFA India | ALF-A18644-0E | 2-Aminonaphthalene-1-sulfonic acid, 98% | 81-16-3 | 2500g | ₹37902 | 2022-05-26 | Buy |
2-Aminonaphthalene-1-sulfonic acid Chemical Properties,Uses,Production
Chemical Properties
Grey white to light pink powder. 2-Aminonaphthalene-1-sulfonic acid [81-16-3]. Tobias acid, C10H9NO3S, Mr 223.24, is sparingly soluble in water but the sodium salt is readily soluble. Coupling with diazo compounds takes place in the 1-position with elimination of the sulfonic acid group.
Uses
Azo dye intermediate, optical brighteners. Sulfonation with oleum gives 2-aminonaphthalene-1,5-disulfonic acid, which can be desulfonated to produce 2-aminonaphthalene-5- sulfonic acid. Tobias acid is used as a diazo component in acid dyes (e.g., C.I. Acid Yellow 19), red reactive dyes, and pigments such as the important Lithol Reds, [e.g., C.I. Pigment Red 49]. The free acid of C.I. Pigment Red 49 is also remarkably insoluble and can be used as a pigment.
Production Methods
2-Hydroxynaphthalene-1-sulfonic acid is heated with a mixture of ammonia and ammonium sulfite in an autoclave at 150 ℃ and 1 MPa for 30 h. The reaction mixture is added to a slurry of lime, and excess ammonia is driven off. Inorganic calcium salts are filtered off at 80℃, and the filtrate is acidified with hydrochloric acid at 40℃ to precipitate Tobias acid in 95 % yield. Care must be taken throughout the process to avoid desulfonation and formation of 2- naphthylamine.
General Description
2-Amino-1-naphthalenesulfonic acid is a manufacturing intermediate in the monosulfo monoazo color additive D&C Red No. 34 and its lakes.
Purification Methods
Crystallise the acid under nitrogen from boiling water and dry it in a steam oven [Bryson Trans Faraday Soc 47 522, 527 1951]. [Beilstein 14 III 2240, 14 IV 2792.]
2-Aminonaphthalene-1-sulfonic acid Preparation Products And Raw materials
Raw materials
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