Naphthalene-2,7-disulfonic acid

Product Name: Naphthalene-2,7-disulfonic acid
CAS No.: 92-41-1
Chemical Name: Naphthalene-2,7-disulfonic acid
Synonyms: Ebert-Merz α-acid;naphthalene-2,7-disulfonicaci;3,6-Naphthalenedisulfonic acid;2,7-NAPHTHALENE DISULFONIC ACID;naphthalene-2,7-disulfonic acid;naphthalene-2,7-disulphonic acid
CBNumber: CB5297140
Molecular Formula: C10H8O6S2
Formula Weight: 288.3
MOL File: 92-41-1.mol

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Naphthalene-2,7-disulfonic acid Property

Melting point:: 199°C
Boiling point:: 400.53°C (rough estimate)
Density: 1.6867 (rough estimate)
refractive index: 1.6950 (estimate)
storage temp.: 2-8°C
pka: -0.33±0.40(Predicted)
CAS DataBase Reference: 92-41-1(CAS DataBase Reference)
EPA Substance Registry System: 2,7-Naphthalenedisulfonic acid (92-41-1)

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Safety

RIDADR: 1759
HazardClass: 8
PackingGroup: III
HS Code: 2904100090

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Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Danger

Hazard statements

H314Causes severe skin burns and eye damage

Precautionary statements

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

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

P310Immediately call a POISON CENTER or doctor/physician.

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N-Bromosuccinimide Price

Matrix Scientific

Product number: 098990
Product name: Naphthalene-2,7-disulfonic acid
Purity: 95+%
Packaging: 250mg
Price: $341
Updated: 2021/12/16

AK Scientific

Product number: 5613AC
Product name: Naphthalene-2,7-disulfonicacid
Packaging: 250mg
Price: $510
Updated: 2021/12/16

Matrix Scientific

Product number: 098990
Product name: Naphthalene-2,7-disulfonic acid
Purity: 95+%
Packaging: 1g
Price: $756
Updated: 2021/12/16

American Custom Chemicals Corporation

Product number: DYE0002087
Product name: 2,7-NAPHTHALENE DISULFONIC ACID
Purity: 98.00%
Packaging: 10G
Price: $1715.18
Updated: 2021/12/16

American Custom Chemicals Corporation

Product number: DYE0002087
Product name: 2,7-NAPHTHALENE DISULFONIC ACID
Purity: 98.00%
Packaging: 500G
Price: $4519.52
Updated: 2021/12/16

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Naphthalene-2,7-disulfonic acid Chemical Properties,Usage,Production

Chemical Properties

White, crystalline solid.Soluble in water. Combustible. Naphthalene-2,7-disulfonic acid [92- 41-1]. C10H8O6S2, Mr 288.28; the sodium salt of Naphthalene-2,7-disulfonic acid is much more soluble than that of the 2,6- isomer but can be isolated and purified by precipitation of the calcium salt at lower temperature followed by recrystallization.

Uses

Intermediate for dyes. The disodium salt of 8 gives 2-hydroxynaphthalene-7-sulfonic acid or 2,7-dihydroxynaphthalene by fusion processes. Sulfonation by oleum gives the 1,3,6-trisulfonic acid, and nitration gives 1-nitronaphthalene-3,6- disulfonic acid. In sulfuric acid solution, the disodium salt of naphthalene-2,7-disulfonic acid undergoes an unusual reaction at the 4-position with 4,40 -bis- (dimethylamino)benzhydrol. The resulting condensation product is oxidized with lead dioxide to give the acid basic dye C.I. Acid Green 16.

Production Methods

The 2,7-disulfonic acid is always the main product of high-temperature sulfonation of naphthalene, but at 160 C it converts slowly to an equilibrium mixture containing ca. 30 % of the 2,6-isomer. Crystallization of the pure product from conventional sulfonation is difficult, and alternative processes, (for example, reaction of naphthalene vapor with sulfur trioxide in the gas phase at 220 C) are said to give a purer product.

Definition

ChEBI: A naphthalenesulfonic acid in which the sulfo groups are attached to positions 2 and 7 of the naphthalene ring.

Purification Methods

Crystallise the acid from conc HCl. The disulfonamide has m 273o (from EtOH). [Beilstein 11 II 119, 11 III 463.]

Naphthalene-2,7-disulfonic acid Preparation Products And Raw materials

Raw materials

Preparation Products

ERIO GREEN B 1,8-Dihydroxynaphthylene-3,6-disulfonic acid

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View Lastest Price from Naphthalene-2,7-disulfonic acid manufacturers

Career Henan Chemical Co

Product: Naphthalene-2,7-disulfonic acid 92-41-1
Price: US $1.00/ASSAYS
Min. Order: 1ASSAYS
Purity: 99%
Supply Ability: 100KG
Release date: 2020-01-07

92-41-1, Naphthalene-2,7-disulfonic acidRelated Search:

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naphthalene-2,7-disulfonic acid

2,7-NAPHTHALENE DISULFONIC ACID

naphthalene-2,7-disulphonic acid

3,6-Naphthalenedisulfonic acid

Ebert-Merz α-acid

naphthalene-2,7-disulfonicaci

92-41-1

91-41-1

C10H8S2O6

Intermediates of Dyes and Pigments

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