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ChemicalBook >> CAS DataBase List >>2-Naphthol-6,8-disulfonic acid

2-Naphthol-6,8-disulfonic acid

2-Naphthol-6,8-disulfonic acid Structure
2-Naphthol-6,8-disulfonic acid structure
CAS No.
118-32-1
Chemical Name:
2-Naphthol-6,8-disulfonic acid
Synonyms
-Naphthol-disulphonicacid;β-Naphtholdisulfonic acid;2-NAPHTHOL-6,8-DISULFONIC ACID;NAPHTHOL-6,8-DIPOTASSIUMDISUFONATE;7-hydroxy-3-naphthalenedisulfonicacid;7-hydroxynaphthalene-1,3-disulfonicaci;7-Hydroxy-1,3-naphthalenedisulfonicacid;2-Hydroxynaphthalene-6,8-disulfonicacid;7-hydroxynaphthalene-1,3-disulfonic acid;7-hydroxynaphthalene-1,3-disulphonicacid
CBNumber:
CB6838933
Molecular Formula:
C10H8O7S2
Molecular Weight:
304.3
MDL Number:
MFCD00021514
MOL File:
118-32-1.mol
MSDS File:
SDS
TDS File:
TDS
Last updated:2026-05-28 06:28:22
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2-Naphthol-6,8-disulfonic acid Properties

Boiling point 415.13°C (rough estimate)
Density 1.7421 (rough estimate)
refractive index 1.6000 (estimate)
form solid
pka -0.33±0.40(Predicted)
color Off-white
FDA UNII 5995F5R8Y9
EPA Substance Registry System 1,3-Naphthalenedisulfonic acid, 7-hydroxy- (118-32-1)

SAFETY

Risk and Safety Statements

Symbol(GHS)  Exclamation Mark (GHS07)
GHS07
Signal word  Warning
Hazard statements  H319-H335-H302+H312+H332-H315
Precautionary statements  P280-P301+P312-P362+P364
TSCA  TSCA listed
HS Code  2904100090

2-Naphthol-6,8-disulfonic acid price More Price(25)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Usbiological 285509 2-Naphthol-6,8-disulfonic acid Asreported 118-32-1 1g $340 2026-06-03 Buy
Usbiological 285509 2-Naphthol-6,8-disulfonic acid Asreported 118-32-1 2g $460 2026-06-03 Buy
Usbiological 285509 2-Naphthol-6,8-disulfonic acid Asreported 118-32-1 5g $672 2026-06-03 Buy
Usbiological 285509 2-Naphthol-6,8-disulfonic acid Asreported 118-32-1 10g $885 2026-06-03 Buy
Usbiological 285509 2-Naphthol-6,8-disulfonic acid Asreported 118-32-1 25g $1238 2026-06-03 Buy
Product number Packaging Price Buy
285509 1g $340 Buy
285509 2g $460 Buy
285509 5g $672 Buy
285509 10g $885 Buy
285509 25g $1238 Buy

2-Naphthol-6,8-disulfonic acid Chemical Properties, Uses, Production

Chemical Properties

2-Hydroxynaphthalene-6,8-disulfonic acid [118-32-1]. (7-hydroxynaphthalene-1,3- disulfonic acid), G acid, C10H8O7S2, Mr 304.3: most salts of 55 are more readily soluble in water than those of R acid, with the notable exception of the potassium salt. Sulfonation with 20 % oleum at 100℃ yields 2-hydroxynaphthalene3,6,8-trisulfonic acid. Diazo coupling takes place in the 1-position, although the reaction is sluggish, as in the case of 2-hydroxynaphthalene8-sulfonic acid.

Uses

The G acid is aminated (Bucherer reaction) to give 2-aminonaphthalene-6,8- disulfonic acid and subjected to caustic fusion at 200℃ to yield 2,8-dihydroxynaphthalene-6-sulfonic acid (a precursor of g acid). It is also used as a coupling component for a wide range of azo colorants, e.g., C.I. Acid Orange 10, C.I. Acid Red 187, and C.I. Food Red 7.

Production Methods

2-Naphthol is added to 98 % sulfuric acid at 40℃. Then, 20 % oleum is added over 6 h and the temperature is allowed to rise to 60℃. The reaction is completed by heating for a further 16 h at 60℃ followed by 15 h at 80℃. After the reaction mixture has been poured into water, potassium chloride is added to the hot solution and the batch is cooled slowly to 35℃ before filtering off the crystalline dipotassium salt of G acid and carefully washing out any residual R salt; the yield is 60 %. In addition, R salt can be recovered from the filtrate in 12 % yield after conversion to its sodium salt.

2-Naphthol-6,8-disulfonic acid Preparation Products And Raw materials

Raw materials

Fuming sulfuric acid Naphthenic acid Sulfuric acid

Preparation Products

Disodium 2-naphthol-3,6-disulfonate Acid red 114 disodium 7-hydroxy-8-[[4'-[[4-[[(p-tolyl)sulphonyl]oxy]phenyl]azo][1,1'-biphenyl]-4-yl]azo]naphthalene-1,3-disulphonate Aluminium, 7-hydroxy-8-[(4-sulfo-1-naphthalenyl)azo]-1,3-naphthalenedisulfonic acid complex Reactive Orange 125
Chromate(5-), bis(8-((5-((diethylamino)sulfonyl)-2-(hydroxy-kappaO)phenyl)azo-kappaN1)-7-(hydroxy-kappaO)-1,3-naphthalenedisulfonato(4-))-, tetrasodium hydrogen 1,3-Naphthalenedisulfonic acid, 8,8'-[[1,1'-biphenyl]-4,4'-diylbis(azo)]bis[7-hydroxy-, tetrasodium salt SOLVENT RED 30 Acid Red 374 Acid Red 18
Acid Green 50 DIRECT RED 37 Chromium, 8-[(5-chloro-2-hydroxyphenyl)azo]-7-hydroxy-1,3-naphthalenedisulfonic acid complex Acid Red 73 DIRECT FAST RED 3B
CRYSTAL PONCEAU 6R 1,3-Naphthalenedisulfonic acid, 8-[[2,2'-dimethyl-4'-[[2-oxo-1-[(phenylamino)carbonyl]propyl]azo][1,1'-biphenyl]-4-yl]azo]-7-hydroxy-, disodium salt Acid Orange 10

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2-Naphthol-6,8-disulfonic acid Suppliers

Global Suppliers ( 101)
Supplier Tel Email Country ProdList Advantage
TAIYUAN RHF CO.,LTD. +86 351 7031519 sales@RHFChem.com China 2334 56
Syntechem Co.,Ltd info@syntechem.com China 12973 57
Shanghai Aladdin Bio-Chem Technology Co.,LTD 400-6206333 13167063860 anhua.mao@aladdin-e.com China 29977 65
Quality Control Solutions Ltd. 0755-66853366 13670046396 orders@qcsrm.com China 18188 56
Sichuan Wei Keqi Biological Technology Co., Ltd. 028-81700200 18116577057 3003855609@qq.com China 7717 56
Hunan HuaTeng Pharmaceutical Co., Ltd., 400-8592883 15367835770 sales@huatengsci.com China 5869 58
Shandong Boluoda Biological Technology Co., Ltd. 0531-68651502 2310993908@qq.com China 3228 58
Hangzhou J&H Chemical Co., Ltd. 0571-87396432 sales@jhechem.com China 14905 59
Shanghai YuanYe Biotechnology Co., Ltd. 15026964105 2881489226@qq.com China 89667 60
Amadis Chemical Company Limited 571-89925085 sales@amadischem.com China 131885 58
Supplier Advantage
TAIYUAN RHF CO.,LTD. 56
Syntechem Co.,Ltd 57
Shanghai Aladdin Bio-Chem Technology Co.,LTD 65
Quality Control Solutions Ltd. 56
Sichuan Wei Keqi Biological Technology Co., Ltd. 56
Hunan HuaTeng Pharmaceutical Co., Ltd., 58
Shandong Boluoda Biological Technology Co., Ltd. 58
Hangzhou J&H Chemical Co., Ltd. 59
Shanghai YuanYe Biotechnology Co., Ltd. 60
Amadis Chemical Company Limited 58

View Latest Price from 2-Naphthol-6,8-disulfonic acid manufacturers

Image Update time Product Price Min. Order Purity Supply Ability Manufacturer
2-Naphthol-6,8-disulfonic acid pictures 2026-06-30 2-Naphthol-6,8-disulfonic acid
118-32-1
 1kg 99% 10000KGS Shaanxi Dideu New Materials Co. Ltd

118-32-1 (2-Naphthol-6,8-disulfonic acid) Related Search:

PALATINE CHROME GREEN Acid Red 18 disodium 7-hydroxy-8-[[4'-[[4-[[(p-tolyl)sulphonyl]oxy]phenyl]azo][1,1'-biphenyl]-4-yl]azo]naphthalene-1,3-disulphonate 2-Naphthol-6,8-disulfonic acid PONCEAU 6R
DIRECT FAST RED 3B disodium 8-[[3,3'-dimethoxy-4'-[[4-[[(p-tolyl)sulphonyl]oxy]phenyl]azo][1,1'-biphenyl]-4-yl]azo]-7-hydroxynaphthalene-1,3-disulphonate 2-NAPHTHOL-6,8-DISULFONIC ACID DIPOTASSIUM SALT 7-hydroxy-1,3-naphthalenesulfonic acid, potassium salt DIRECT SCARLET B
Acid Red 73 CRYSTAL PONCEAU 6R Acid Orange 10 2-Amino-5-hydroxynaphthalene-1,7-disulfonic acid ORANGE G
1-Naphthol-3,8-disulfonic acid disodium salt 1-Naphthol-3,8-disulfonic acid Acid red 114

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7-Hydroxy-1,3-naphthalenedisulfonicacid 7-hydroxynaphthalene-1,3-disulfonic acid hydrate 7-hydroxy-3-naphthalenedisulfonicacid 7-hydroxynaphthalene-1,3-disulphonicacid -Naphthol-disulphonicacid 2-NAPHTHOL-6,8-DISULFONIC ACID 7-hydroxynaphthalene-1,3-disulfonic acid 2-Hydroxynaphthalene-6,8-disulfonicacid NAPHTHOL-6,8-DIPOTASSIUMDISUFONATE β-Naphtholdisulfonic acid 1,3-Naphthalenedisulfonicacid, 7-hydroxy- 2-NAPHTHOL-6 8-DISULFONIC ACID ( G SALT ) TIANFUCHEM--High purity 118-32-1 2-Naphthol-6,8-disulfonic acid 7-hydroxynaphthalene-1,3-disulfonicaci G salt (Disodium 2-naphthol-6,8-disulfonate) 118-32-1 C10H6O7S2K2 Intermediates of Dyes and Pigments