ChemicalBook > CAS DataBase List > 1,5-Naphthalenedisulfonic acid

1,5-Naphthalenedisulfonic acid

Product Name: 1,5-Naphthalenedisulfonic acid
CAS No.: 81-04-9
Chemical Name: 1,5-Naphthalenedisulfonic acid
Synonyms: ARMSTRONG ACID;Naphthalene-1,5-disulfonic acid tetrahydrate;29685;NSC 9588;1,5-NaphthaL;1,5-disulfonic acid;Cabalt trioxide, AR;1,5-Naphthalenedisul;Hexetidine EP Impurity D;Naphthalin-1,5-disulfonsure
CBNumber: CB8346027
Molecular Formula: C10H8O6S2
Formula Weight: 288.3
MOL File: 81-04-9.mol

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1,5-Naphthalenedisulfonic acid Property

Melting point:: 242.5°C (rough estimate)
Boiling point:: 400.53°C (rough estimate)
Density: 1.7040
bulk density: 900kg/m3
vapor pressure: 0Pa at 25℃
refractive index: 1.5630 (estimate)
storage temp.: Store below +30°C.
pka: -0.60±0.40(Predicted)
color: Crystals or plates
PH: 2.4 (20°C, 1g/L in H2O)
Water Solubility: 90.52g/L at 25℃
InChI: InChI=1S/C10H8O6S2/c11-17(12,13)9-5-1-3-7-8(9)4-2-6-10(7)18(14,15)16/h1-6H,(H,11,12,13)(H,14,15,16)
InChIKey: XTEGVFVZDVNBPF-UHFFFAOYSA-N
SMILES: C1(S(O)(=O)=O)=C2C(C(S(O)(=O)=O)=CC=C2)=CC=C1
LogP: -0.94
CAS DataBase Reference: 81-04-9(CAS DataBase Reference)
EPA Substance Registry System: 1,5-Naphthalenedisulfonic acid (81-04-9)

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Safety

Hazard Codes: C
Risk Statements: 34
Safety Statements: 22-24/25-45-36/37/39-26
RIDADR: UN 2585
WGK Germany: 1
HazardClass: 8
PackingGroup: III
HS Code: 2904100090
Toxicity: LD50 orl-rat: 30 g/kg GISAAA 45(3),73,80

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Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Danger

Hazard statements

H314Causes severe skin burns and eye damage

H318Causes serious eye damage

Precautionary statements

P260Do not breathe dust/fume/gas/mist/vapours/spray.

P280Wear protective gloves/protective clothing/eye protection/face protection.

P301+P330+P331IF SWALLOWED: Rinse mouth. Do NOT induce vomiting.

P303+P361+P353IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower.

P304+P340IF INHALED: Remove victim to fresh air and Keep at rest in a position comfortable for breathing.

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.

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N-Bromosuccinimide Price

Sigma-Aldrich

Product number: 8.40104
Product name: 1,5-Naphthalenedisulfonic acid
Purity: for synthesis
Packaging: 25g
Price: $45.4
Updated: 2025/07/31

Sigma-Aldrich

Product number: 8.40104
Product name: 1,5-Naphthalenedisulfonic acid
Purity: for synthesis
Packaging: 250G
Price: $124
Updated: 2025/07/31

TRC

Product number: N378483
Product name: 1,5-NaphthalenedisulfonicAcid
Packaging: 1g
Price: $45
Updated: 2021/12/16

American Custom Chemicals Corporation

Product number: CHM0006239
Product name: 1,5-NAPHTHALENEDISULFONIC ACID
Purity: 95.00%
Packaging: 25G
Price: $1227.91
Updated: 2021/12/16

Matrix Scientific

Product number: 097414
Product name: Naphthalene-1,5-disulfonic acid
Purity: 95+%
Packaging: 25g
Price: $98
Updated: 2021/12/16

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1,5-Naphthalenedisulfonic acid Chemical Properties,Usage,Production

Chemical Properties

Naphthalene-1,5-disulfonic acid [81-04-9]. Armstrong acid, C10H8O6S2, Mr 288.28, crystallizes as the tetrahydrate but dehydrates at 125 ℃ to give the anhydrous acid (mp 240 – 245℃). The disulfonic acid forms an anhydride when treated with oleum below 50℃. This anhydride reacts with ammonia to give a mixture of naphthalene-1,5-disulfonamide and naphthalene-1- sulfonamide-5-sulfonic acid. Treatment of the disodium salt of naphthalene-1,5-disulfonic acid with phosphorus pentachloride at 110℃ gives naphthalene-1,5-disulfonyl chloride (mp 184 ℃), which may also be prepared by chlorosulfonation of naphthalene. Reaction of an aqueous solution of naphthalene-1,5-disulfonic acid with bromide – bromate gives 1,5-dibromonaphthalene so readily that the yellow precipitate may be used to identify very low concentrations of the disulfonic acid.

Uses

The disodium salt of naphthalene-1,5- disulfonic acid gives 1-hydroxynaphthalene-5- sulfonic acid or 1,5-dihydroxynaphthalene (see Section 3.3) by fusion processes. Further sulfonation of the disulfonated reaction mixture gives naphthalene-1,3,5-trisulfonic acid, and nitration leads to 1- and 2-nitronaphthalene-4,8-disulfonic acids as intermediates to the corresponding aminonaphthalene disulfonic acids. Naphthalene-1,5-disulfonic acid is an important stabilizer for diazo compounds.

Definition

ChEBI: Naphthalene-1,5-disulfonic acid is a naphthalenesulfonic acid.

Production Methods

Naphthalene is mixed with 20 % oleum at 20 – 35 C followed by gradual addition of 65 % oleum and further naphthalene alternately. After heating for 6 h at 55 C the reaction mixture is added to water, and the product is precipitated as the free acid by cooling or as the disodium salt by the addition of alkaline sodium sulfate. In each case, the isolated yield is ca. 53 %. The 1,6-disulfonic acid can be recovered from the filtrate. Higher yields of 4 have been reported for alternative processes; for example, solvent sulfonation with sulfur trioxide and chlorosulfonic acid in a solvent such as tetrachloroethylene [24] or sulfonation with oleum through a double screw-feed apparatus.

Flammability and Explosibility

Not classified

Safety Profile

Very low oral toxicity. Whenheated to decomposition it emits toxic fumes of SOx. Seealso SULFONATES.

1,5-Naphthalenedisulfonic acid Preparation Products And Raw materials

Raw materials

Naphthalene Sulfuric acid

Preparation Products

trisodium 2-[[6-[(4,6-dichloro-1,3,5-triazin-2-yl)methylamino]-1-hydroxy-3-sulphonato-2-naphthyl]azo]naphthalene-1,5-disulphonate Reactive Red M-3BE 1,5-Dihydroxy naphthalene trisodium 2-[[6-[(4-amino-6-chloro-1,3,5-triazin-2-yl)methylamino]-1-hydroxy-3-sulphonato-2-naphthyl]azo]naphthalene-1,5-disulphonate Direct Blue 71

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View Lastest Price from 1,5-Naphthalenedisulfonic acid manufacturers

WUHAN FORTUNA CHEMICAL CO., LTD

Product: 1,5-Naphthalenedisulfonic acid 81-04-9
Price: US $0.00/KG
Min. Order: 1KG
Purity: 98.0%
Supply Ability: 500kg/month
Release date: 2023-01-10

Hebei Chuanghai Biotechnology Co., Ltd

Product: 1,5-Naphthalenedisulfonic acid 81-04-9
Price: US $30.00-10.00/KG
Min. Order: 50KG
Purity: 99%
Supply Ability: 500000kg
Release date: 2024-10-25

Hebei Yanxi Chemical Co., Ltd.

Product: 1,5-Naphthalenedisulfonic acid 81-04-9
Price: US $0.00/kg
Min. Order: 1kg
Purity: 0.99
Supply Ability: 20 tons
Release date: 2023-11-27

81-04-9, 1,5-Naphthalenedisulfonic acidRelated Search:

Sodium 1-naphthalenesulfonate 1-Naphthalenesulfonic acid Glycine Folic acid Naphthalene Dinonylnaphthalenesulfonic acid Ethyl 2-(Chlorosulfonyl)acetate 4-Methyl-2-nitroaniline Direct Blue 71 8-AMINO-1,5-NAPHTHALENEDISULFONIC ACID MONOSODIUM SALT DIRECT YELLOW 50 Fast Red B salt 1,5-NAPHTHALENEDISULFONIC ACID DISODIUM SALT DIHYDRATE 98%,Armstrong acid disodium salt Naphthalene-1,3,5-trisulphonic acid 2-NAPHTHYLAMINE-4,6,8-TRISULFONIC ACID 1-Naphthylamine-4,6,8-trisulfonic acid 2-Amino-1,5-naphthalenedisulfonic acid 1,5-NAPHTHALENEDISULFONIC ACID DIMETHYL ESTER,1,5-NAPHTHALENEDISULFONIC ACID DIMETHYL ESTER 98+%

Naphthalene-1,5-disulfonic acid tetrahydrate

1,5-disulfonic acid

5-Naphthalenedisulfonic acid

29685

Naphthalin-1,5-disulfonsure

1,5-phthalenedisulfonic acid

NAPHTHALENE-1,5-DISULFONIC ACID DISODIUM SALT

naphthalene-1,5-disulphonic acid

SODIUM 1,5-NAPHTHALENEDISULFONATE DIBASIC

1,5-Naphthalenedisulphonicacid

1,5-naphthylenedisulfonicacid

2-Naphthylaminedisulfonicacid

1,5-NAPHTHALINEDISULFONIC ACID

1,5-NAPHTHALENEDISULFONIC ACID

1,5-NAPHTHALENEDISULFONIC ACID DISODIUM SALT HYDRATE

1,5-NAPHTHALENE DISULPHONATE

1,5-NAPHTHALENE DISULFONIC ACID SODIUM SALT

1,5-NAPHTHALENE DISULFONIC ACID DISUDIUM SALT

1,5-NAPHTHALENEDISULFONIC ACID, NA SALT

DISODIUM 1,5-NAPHTHALENEDISULFONATE HYDRATE

DISODIUM NAPHTHALENE-1,5-DISULPHONATE

ARMSTRONG ACID

1,5-NAPHTHALENEDISULFONIC ACID 97+%

Naphthalene-γ-disulfonic acid

Naphthalene-δ-disulfonic acid

1,5-Naphthalenebissulfonic acid

Naphthalene-1,5-bis(sulfonic acid)

1,5-Naphthalenedisul

1,5-NAPHTHALENEDISULFONIC ACID FOR SYNTH

1,5-NaphthaL

Hexetidine EP Impurity D

Hexetidine Impurity 4 (Hexetidine EP Impurity D)

1,5-Naphthalenedisulfonic acid ISO 9001：2015 REACH

Cabalt trioxide, AR

naphthalene-1,5-disulfonicaci

NSC 9588

1,5-Naphthalenedisulfonic acid (dry product)

5-disulfonicacidtetrahydrate

81-04-9

80-04-9

1981-04-9

C10H8O6S22H2O

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Organic acids

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