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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

Molecular Weight:: 239.25

MOL File:: 90-51-7.mol

MSDS File:: SDS

Modify Date:: 2024/5/16 10:38:43

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6-Amino-4-hydroxy-2-naphthalenesulfonic acid Properties

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

Risk and Safety Statements

Symbol(GHS)

GHS05,GHS07

Signal word

Danger

Hazard statements

H315-H319-H314

Precautionary statements

P280-P305+P351+P338-P310-P264-P302+P352+P332+P313+P362+P364-P305+P351+P338+P337+P313

Hazard Codes

Risk Statements

Safety Statements

26-27-28-36/37/39-45

RIDADR

UN 2585 8/PG 3

WGK Germany

RTECS

QK1295250

HS Code

2922.21.5000

Toxicity

LD50 intraperitoneal in mouse: > 500mg/kg

NFPA 704

	0
3		0

6-Amino-4-hydroxy-2-naphthalenesulfonic acid price More Price(1)

Manufacturer	Product number	Product description	CAS number	Packaging	Price	Updated	Buy
TCI Chemicals (India)	A0371	6-Amino-4-hydroxy-2-naphthalenesulfonic Acid	90-51-7	25G	₹3500	2022-05-26	Buy

Product number	Packaging	Price	Buy
A0371	25G	₹3500	Buy

6-Amino-4-hydroxy-2-naphthalenesulfonic acid Chemical Properties,Uses,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.

6-Amino-4-hydroxy-2-naphthalenesulfonic acid Preparation Products And Raw materials

Raw materials

2-naphthol-6,8-disulfonic acid dipotassium salt 2-Naphthylamine Sulfur dioxide Color paste Sodium hydroxide

2-Naphthol

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Preparation Products

Direct Grey D disodium 5-((4-acetylamino-2-sulphophenyl)azo)-6-amino-4-hydroxynaphthalene-2-disulphonate 4-Amino-6-[[4'-[(7-amino-1-hydroxy-3-sulfo-2-naphtyl)azo]-1,1'-biphenyl-4-yl]azo]-5-hydroxy-3-[(4-nitrophenyl)azo]-2,7-naphthalenedisulfonic acid trisodium salt C.I. Direct Black 151 Direct Grey D

Acid Red 440 Direct Black 197 CHLORAZOL BLACK BH 5-[[2,4-Diamino-5-[(8-hydroxy-6-sodiosulfo-2-naphthalenyl)azo]phenyl]azo]-4-hydroxy-3-[[4'-[(4-hydroxyphenyl)azo][1,1'-biphenyl]-4-yl]azo]naphthalene-2,7-disulfonic acid disodium salt 3-Amino-4-[[4'-[(2-amino-8-hydroxy-6-sodiosulfo-1-naphthalenyl)azo]-1,1'-biphenyl-4-yl]azo]naphthalene-2,7-disulfonic acid disodium salt

DIRECT BLACK 22 C.I. Direct Brown 166 2-Naphthalenesulfonic acid, 6-[[4-amino-6(or 7)-sulfo-1-naphthalenyl]azo]-3-[[4-[(2,4-diaminophenyl)azo]phenyl]azo]-4-hydroxy-, disodium salt Glycine, N-[5-amino-4-[2-[4-[2-[[2-(2,4-diamino-5-methylphenyl)diazenyl]hydroxysulfo-2-naphthalenyl]diazenyl]phenyl]diazenyl]-2-methylphenyl]-, sodium salt (1:2) ACID RED 266

disodium 6-amino-5-[(4-amino-2-sulphonatophenyl)azo]-4-hydroxynaphthalene-2-sulphonate

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6-Amino-4-hydroxy-2-naphthalenesulfonic acid Suppliers

Global( 349)Suppliers

Supplier	Tel	Country	ProdList	Advantage	Inquiry
Shree Ganesh Dye Chem	+91 079-26872726	Gujarat, India	97	58	Inquiry
Parshwanath Group of Indusries	+91-9979874744 +91-9825244644	Gujarat, India	211	58	Inquiry
Jagson Colorchem Limited	+91-9879484214 +91-9879484214	Gujarat, India	318	58	Inquiry
Vipul Organics Ltd	+91-2266139999 +91-2266139999	Maharashtra, India	277	58	Inquiry
Bodal Chemicals Ltd	+91-9909950857 +91-9825034567	Gujarat, India	132	58	Inquiry
Shubhlaxmi Industries	+91-9825244644 +91-9979874747	Gujarat, India	9	58	Inquiry
Santel Industries	+91-7940075559 +91-7926401417	Gujarat, India	98	58	Inquiry
Bhageria Industries Limited	+91-2240436666 +91-2240436666	Maharashtra, India	5	58	Inquiry
Shree Pushkar Chemicals And Fertilisers Ltd	+91-2242702525 +91-8879310450	Maharashtra, India	16	58	Inquiry
Jaffs Dyechem Private Limited	+91-9825035135 +91-7925392314	Gujarat, India	309	58	Inquiry

Supplier	Advantage
Shree Ganesh Dye Chem	58
Parshwanath Group of Indusries	58
Jagson Colorchem Limited	58
Vipul Organics Ltd	58
Bodal Chemicals Ltd	58
Shubhlaxmi Industries	58
Santel Industries	58
Bhageria Industries Limited	58
Shree Pushkar Chemicals And Fertilisers Ltd	58
Jaffs Dyechem Private Limited	58

6-Amino-4-hydroxy-2-naphthalenesulfonic acid Spectrum

6-Amino-4-hydroxy-2-naphthalenesulfonic acid(90-51-7)IR1 6-Amino-4-hydroxy-2-naphthalenesulfonic acid(90-51-7)IR2

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Galmarine(silymarine soluble) 2-Amino-8-hydroxynaphthalene-6-sulfonic acid 6-AMINO-4-HYDROXY-2-NAPHTHALENE-SULPHONICACID 6-Amino-4-hydroxy-2-naphthalinsulfonsure 6-AMINO-4-HYDROXY-2-NAPHTHALENESULFONIC ACID (GAMMA ACID) 2-AMINO-8-NAPTHOL-6-SULFONIC ACID 1-Hydroxy-7-amino-3-naphthalenesulfonic acid 4-Hydroxy-6-amino-2-naphthalenesulfonic acid 6-azanyl-4-hydroxy-naphthalene-2-sulfonic acid gamma Acid 2-Amino-8-naphthol-6-sulfonic Acid 7-Amino-1-naphthol-3-sulfonic Acid 6-AMINO-4-NAPHTHOL-2-SULFONIC ACID 6-AMINO-4-HYDROXY-2-NAPHTHALENESULFONIC ACID GAMMA ACID 7-AMINO-1-NAPHTHOL-3-SULFONIC ACID 7-AMINO-1-HYDROXY-3-SULFONAPHTHALENE 2-AMINO-8-NAPHTHOL-6-SULFONIC ACID 2-Naphthalenesulfonicacid,6-amino-4-hydroxy- 6-amino-4-hydroxy-2-naphthalenesulfonicaci 6-Amino-4-hydroxynaphthalene-2-sulfonicacid 7-amino-1-naphthol-3-sulfonicaci aminonaphtholsulfonicacidgamma c.i.developer3 yacid 6-amino-4-hydroxynaphthalene-2-sulphonic acid 2-Amino-8-naphthol-6-sulfonic acid (γ acid) 6-Amino-4-hydroxy-2-naphthalenesulfonic acid OR 2-Amino-8-hydroxynaphthalene-6-sulfonic acid 6-Amino-4-hydroxy-2-naphthalenesulfonic Acid > 6-Amino-4-hydroxy-2-naphthalenesulfonic acid ISO 9001：2015 REACH 2-Amino-8-naphthol-6-sulfonic acid ( gamma Acid ) 90-51-7 6-Amino-4-hydroxy-2-naphthalenesulfonic acid 6-Amino-4-hydroxynaphthalin-2-sulfonsure 90-51-7 H2NCd0H5OHSO3H C10H9O4NS Organic Building Blocks Sulfur Compounds Sulfonic/Sulfinic Acids Building Blocks SULFONIC ACID Building Blocks Chemical Synthesis Organic Building Blocks Sulfonic/Sulfinic Acids Sulfur Compounds Intermediates Organics Intermediates of Dyes and Pigments