6-Amino-4-hydroxy-2-naphthalenesulfonic acid
- Product Name
- 6-Amino-4-hydroxy-2-naphthalenesulfonic acid
- CAS No.
- 90-51-7
- Chemical Name
- 6-Amino-4-hydroxy-2-naphthalenesulfonic acid
- Synonyms
- yacid;GAMMA ACID;c.i.developer3;Galmarine(silymarine soluble);aminonaphtholsulfonicacidgamma;7-amino-1-naphthol-3-sulfonicaci;2-AMINO-8-NAPTHOL-6-SULFONIC ACID;6-AMINO-4-NAPHTHOL-2-SULFONIC ACID;7-AMINO-1-NAPHTHOL-3-SULFONIC ACID;2-AMINO-8-NAPHTHOL-6-SULFONIC ACID
- CBNumber
- CB4443007
- Molecular Formula
- C10H9NO4S
- Formula Weight
- 239.25
- MOL File
- 90-51-7.mol
6-Amino-4-hydroxy-2-naphthalenesulfonic acid Property
- Boiling point:
- 458℃[at 101 325 Pa]
- Density
- 1.4338 (rough estimate)
- vapor pressure
- 0Pa at 25℃
- refractive index
- 1.6500 (estimate)
- storage temp.
- Keep in dark place,Sealed in dry,Room Temperature
- pka
- -0.20±0.40(Predicted)
- form
- powder to crystal
- color
- White to Gray to Brown
- Water Solubility
- 4.5g/L(hot water)
- InChIKey
- HBZVNWNSRNTWPS-UHFFFAOYSA-N
- LogP
- -1.39
- CAS DataBase Reference
- 90-51-7(CAS DataBase Reference)
- EPA Substance Registry System
- 2-Naphthalenesulfonic acid, 6-amino-4-hydroxy- (90-51-7)
Safety
- Hazard Codes
- C
- Risk Statements
- 34
- Safety Statements
- 26-27-28-36/37/39-45
- RIDADR
- UN 2585 8/PG 3
- WGK Germany
- 1
- RTECS
- QK1295250
- HS Code
- 2922.21.5000
- Toxicity
- LD50 intraperitoneal in mouse: > 500mg/kg
Hazard and Precautionary Statements (GHS)
- Symbol(GHS)
-
- Signal word
- Danger
- Hazard statements
-
H314Causes severe skin burns and eye damage
H315Causes skin irritation
H319Causes serious eye irritation
- Precautionary statements
-
P264Wash hands thoroughly after handling.
P264Wash skin thouroughly after handling.
P280Wear protective gloves/protective clothing/eye protection/face protection.
P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.
P310Immediately call a POISON CENTER or doctor/physician.
N-Bromosuccinimide Price
- Product number
- A0371
- Product name
- 6-Amino-4-hydroxy-2-naphthalenesulfonic Acid
- Purity
- >97.0%(HPLC)(T)
- Packaging
- 25g
- Price
- $40
- Updated
- 2024/03/01
- Product number
- A0371
- Product name
- 6-Amino-4-hydroxy-2-naphthalenesulfonic Acid
- Purity
- >97.0%(HPLC)(T)
- Packaging
- 500g
- Price
- $167
- Updated
- 2021/12/16
- Product number
- A611545
- Product name
- 6-Amino-4-hydroxy-2-naphthalenesulfonic Acid
- Packaging
- 25g
- Price
- $120
- Updated
- 2021/12/16
- Product number
- FA165510
- Product name
- 2-Amino-8-naphthol-6-sulfonic acid
- Packaging
- 250g
- Price
- $125
- Updated
- 2021/12/16
- Product number
- T958
- Product name
- 6-Amino-4-hydroxy-2-naphthalenesulfonic Acid
- Packaging
- 25g
- Price
- $67
- Updated
- 2021/12/16
6-Amino-4-hydroxy-2-naphthalenesulfonic acid Chemical Properties,Usage,Production
Chemical Properties
2-Amino-8-hydroxynaphthalene-6-sulfonic acid [90-51-7]. (6-amino-4-hydroxynaphthalene-2-sulfonic acid), g acid, C10H9NO4S, Mr 239.2, is obtained as white or gray crystals which are only sparingly soluble in water even at 100℃ (0.4%). The sodium salt dissolves readily in water to form solutions that exhibit a blue fluorescence. Coupling with diazo compounds is usually carried out under acid conditions and occurs in the 1-position; coupling in the 7-position can be effected in alkaline solution.
Uses
6-Amino-4-hydroxy-2-naphthalenesulfonic Acid is used in the synthesis of mono-azo dyes for application towards synthetic fibers. Also used in the synthesis of dyes with high technical properties for silk. The so-called g acid is an important component in azo dyes; coupling can be carried out under acid or alkaline conditions. The oamino azo configuration obtained under acid conditions leads to high lightfastness of special importance in monoazo acid red dyes for wool and polyamide, such as C.I. Acid Reds 37, 57, and 266.
Production Methods
2-Aminonaphthalene-6,8-disulfonic acid liquor is added over 16 h to 70 % sodium hydroxide at 190℃, while the water is allowed to evaporate to maintain the temperature. The reaction mixture is then heated for a further 6 h. Completion of the reaction is indicated by a workedup sample giving identical titers for both diazotization and coupling. The batch is diluted with water, acidified, and heated at 75℃ to expel sulfur dioxide. The product is filtered off at 55℃ and washed with warm water; yield is 84 %.
An improved process with 90 % yield is claimed by feeding concentrated 2-aminonaphthalene-6,8-disulfonic acid dipotassium salt liquor and caustic soda liquor simultaneously into the fusion reactor.
Flammability and Explosibility
Not classified
6-Amino-4-hydroxy-2-naphthalenesulfonic acid Preparation Products And Raw materials
Raw materials
Preparation Products
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View Lastest Price from 6-Amino-4-hydroxy-2-naphthalenesulfonic acid manufacturers
- Product
- 6-Amino-4-hydroxy-2-naphthalenesulfonic acid 90-51-7
- Price
- US $32.00/kg
- Min. Order
- 1kg
- Purity
- 99%
- Supply Ability
- 5000kg/week
- Release date
- 2024-05-15
- Product
- 6-Amino-4-hydroxy-2-naphthalenesulfonic acid 90-51-7
- Price
- US $0.00/Kg/Drum
- Min. Order
- 1KG
- Purity
- 90%min
- Supply Ability
- 1000kgs
- Release date
- 2021-08-10
- Product
- 6-Amino-4-hydroxy-2-naphthalenesulfonic acid 90-51-7
- Price
- US $1.00/kg
- Min. Order
- 1kg
- Purity
- 99%
- Supply Ability
- 500KG
- Release date
- 2018-12-20