| Identification | More | [Name]
2-Aminonaphthalene-1-sulfonic acid | [CAS]
81-16-3 | [Synonyms]
2-AMINO-1-NAPHTHALENESULFONIC ACID
2-AMINONAPHTHALENE-1-SULFONIC ACID
2-NAPHTHYLAMINE-1-SULFONIC ACID
2 NAPHTHYLAMINE SULPHONIC ACID
BETA-NAPHTHYLAMINE-1-SULFONIC ACID
SUPER J ACID
TOBIAS ACID
1-Naphthalenesulfonic acid, 2-amino-
1-Naphthalenesulfonicacid,2-amino-
2-amino-1-naphthalenesulfonic
2-amino-1-naphthalenesulfonicaci
Kyselina 2-naftylamin-1-sulfonova
Kyselina tobiasova
kyselina2-naftylamin-1-sulfonova
kyselina2-naftylamin-1-sulfonova(czech)
kyselinatobiasova
kyselinatobiasova(czech)
2-aminonaphthalene-1-sulphonic acid
TOBIAS ACI
TOBIAS ACID 97 PCT | [EINECS(EC#)]
201-331-5 | [Molecular Formula]
C10H9NO3S | [MDL Number]
MFCD00003988 | [Molecular Weight]
223.25 | [MOL File]
81-16-3.mol |
| Chemical Properties | Back Directory | [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 | [Uses]
Azo dye intermediate, optical brighteners. | [CAS DataBase Reference]
81-16-3(CAS DataBase Reference) | [NIST Chemistry Reference]
2-Naphthylamine-1-sulfonic acid(81-16-3) | [EPA Substance Registry System]
81-16-3(EPA Substance) |
| Safety Data | Back Directory | [Risk Statements ]
R36/37/38:Irritating to eyes, respiratory system and skin .
R40:Limited evidence of a carcinogenic effect. | [Safety Statements ]
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 . | [RIDADR ]
2585 | [WGK Germany ]
1
| [RTECS ]
QK1250000
| [TSCA ]
Yes | [HS Code ]
2921.45.9010 | [HazardClass ]
8 | [PackingGroup ]
III | [Hazardous Substances Data]
81-16-3(Hazardous Substances Data) |
| Raw materials And Preparation Products | Back Directory | [Raw materials]
Sodium hydroxide-->Hydrochloric acid-->Sulfuric acid-->Ammonia-->Chlorosulfonic acid-->Sulfur dioxide-->2-Naphthol-->2-Ethylnitrobenzene-->1,2,3-Triazine, 4,5,6-trifluoro--->2-HYDROXY-1-NAPHTHALENESULFONIC ACID-->1-Amino-8-hydroxynaphthalene-3,6-disulphonic acid | [Preparation Products]
J acid-->Lithol Red-->sodium 2-[(2-hydroxynaphthyl)azo]naphthalenesulphonate-->3-Hydroxy-N-2-naphthyl-2-naphthamide-->ReactivebrilliantredKE-7B-->disodium 2-[[1-(2,5-dichloro-4-sulphonatophenyl)-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-4-yl]azo]naphthalene-1-sulphonate-->REACTIVE RED 195-->2-Amino-1,5-naphthalenedisulfonic acid-->6-AMINO-1-NAPHTHOL-->1,2-DICHLORONAPHTHALENE-->2-Naphthylamine-->6-Amino-1-naphthalenesulfonic acid-->2-Aminotoluene-5-sulfonic acid-->disodium 2-[[1-(2-chloro-5-sulphonatophenyl)-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-4-yl]azo]naphthalene-1-sulphonate-->ACID YELLOW 19 |
| Hazard Information | Back Directory | [Chemical Properties]
Grey white to light pink powder | [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.] |
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