2-Aminonaphthalene-1-sulfonic acid
- Product Name
- 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
- Formula Weight
- 223.25
- MOL File
- 81-16-3.mol
2-Aminonaphthalene-1-sulfonic acid Property
- 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 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
- Hazardous Substances Data
- 81-16-3(Hazardous Substances Data)
Hazard and Precautionary Statements (GHS)
- Symbol(GHS)
-
- Signal word
- Warning
- Hazard statements
-
H319Causes serious eye irritation
H320Causes eye irritation
- Precautionary statements
-
P264Wash hands thoroughly after handling.
P264Wash skin thouroughly after handling.
P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.
P337+P313IF eye irritation persists: Get medical advice/attention.
N-Bromosuccinimide Price
- Product number
- A0343
- Product name
- 2-Amino-1-naphthalenesulfonic Acid
- Purity
- >98.0%(HPLC)(T)
- Packaging
- 25g
- Price
- $48
- Updated
- 2024/03/01
- Product number
- A0343
- Product name
- 2-Amino-1-naphthalenesulfonic Acid
- Purity
- >98.0%(HPLC)(T)
- Packaging
- 500g
- Price
- $408
- Updated
- 2024/03/01
- Product number
- A18644
- Product name
- 2-Aminonaphthalene-1-sulfonic acid, 98%
- Packaging
- 500g
- Price
- $70.4
- Updated
- 2024/03/01
- Product number
- A18644
- Product name
- 2-Aminonaphthalene-1-sulfonic acid, 98%
- Packaging
- 2500g
- Price
- $239
- Updated
- 2023/06/20
- Product number
- A618330
- Product name
- 2-Amino-1-naphthalenesulfonic Acid
- Packaging
- 250g
- Price
- $120
- Updated
- 2021/12/16
2-Aminonaphthalene-1-sulfonic acid Chemical Properties,Usage,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.
Uses
2-Amino-1-naphthalenesulfonic acid has been used in the preparation of 2-(2-naphthylamino)benzoxazole by reacting with 2-chlorobenzoxazole.
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
Preparation Products
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View Lastest Price from 2-Aminonaphthalene-1-sulfonic acid manufacturers
- Product
- 2-Aminonaphthalene-1-sulfonic acid 81-16-3
- Price
- US $6.00/kg
- Min. Order
- 1kg
- Purity
- 99%
- Supply Ability
- 20 tons
- Release date
- 2023-03-17
- Product
- 2-Aminonaphthalene-1-sulfonic acid 81-16-3
- Price
- US $0.00/KG
- Min. Order
- 1KG
- Purity
- 99%
- Supply Ability
- 50000KG/month
- Release date
- 2023-08-16
- Product
- 2-Aminonaphthalene-1-sulfonic acid 81-16-3
- Price
- US $5.00-2.00/KG
- Min. Order
- 1KG
- Purity
- 99%
- Supply Ability
- 10000kg
- Release date
- 2023-03-28