92-41-1

Basic information

• Product Name: Naphthalene-2,7-disulfonic acid
• Synonyms: naphthalene-2,7-disulfonic acid;2,7-NAPHTHALENE DISULFONIC ACID;naphthalene-2,7-disulphonic acid;3,6-Naphthalenedisulfonic acid;Ebert-Merz α-acid
• CAS NO: 92-41-1
• Molecular Formula: C10H8O6S2
• Molecular Weight: 288.3
• EINECS: 202-154-6
• Product Categories: Intermediates of Dyes and Pigments
• Mol File: 92-41-1.mol
• Article Data: 4

Chemical Properties

• Melting Point: 199°C
• Boiling Point: 400.53°C (rough estimate)
• Appearance: /
• Density: 1.6867 (rough estimate)
• Refractive Index: 1.6950 (estimate)
• Storage Temp.: 2-8°C
• CAS DataBase Reference: Naphthalene-2,7-disulfonic acid(CAS DataBase Reference)
• NIST Chemistry Reference: Naphthalene-2,7-disulfonic acid(92-41-1)
• EPA Substance Registry System: Naphthalene-2,7-disulfonic acid(92-41-1)

Safety Data

• RIDADR: 1759
• HazardClass: 8
• PackingGroup: III
• Hazardous Substances Data: 92-41-1(Hazardous Substances Data)

Usage

Chemical Properties

White, crystalline solid.Soluble in water. Combustible.

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.]

InChI:InChI=1/C10H8O6S2/c11-17(12,13)9-3-1-7-2-4-10(18(14,15)16)6-8(7)5-9/h1-6H,(H,11,12,13)(H,14,15,16)

Upstream product

• 486-54-4 1-amino-naphthalene-2,7-disulfonic acid 
• 91-20-3 naphthalene 
• 7664-93-9 sulfuric acid 
• 7732-18-5 water 
• 120-18-3 naphthalene-2-sulfonate 
• 525-37-1 naphthalene-1,6-disulfonic acid 
• 581-75-9 naphthalene-2,6-disulfonic acid 
• 81-04-9 naphthalene-1,5-disulfonate 
• 122290-27-1 3,6-disulfo-naphthalene-1-diazonium-betaine 
• 92-28-4 2-amino-3,6-naphthalenedisulphonic acid 
• 6251-07-6 4-amino-naphthalene-2,7-disulfonic acid 
• 85-47-2 1-naphthalenesulfonic acid 

Downstream Products

• 107572-88-3 4-(4,4'-bis-diethylamino-α-hydroxy-benzhydryl)-naphthalene-2,7-disulfonic acid 
• 86-66-8 naphthalene-1,3,6-trisulfonic acid 
• 90830-37-8 1-nitro-3,6-naphthalenedisulfonic acid 
• 6361-38-2 2-naphtol-3,7-disulfonic acid 
• 494-44-0 7-aminonaphthalene-2-sulfonic acid 
• 578-85-8 1-naphthol-3,6-disulfonic acid 
• 90-20-0 4-amino-5-hydroxy-2,7-naphthalenedisulfonic acid 
• 71977-56-5 2,7-naphthalenedithiol 
• 582-17-2 2,7-Dihydroxynaphthalene 
• 91-20-3 naphthalene 
• 7664-93-9 sulfuric acid 
• 92-40-0 2-hydroxynaphthalene-7-sulfonic acid 
• 6362-11-4 1,8-diamino-3,6-naphthalenedisulfonic acid 
• 19551-16-7 naphthalene-2,7-disulfonyl dichloride 

Relevant articles and documents

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Environmental-friendly H-acid synthesis method

The invention relates to a synthesis method and in particular relates to an environmental-friendly H-acid synthesis method which comprises the following steps: performing disulfonic treatment, performing bromination treatment, performing nitration treatment, and separating a middle body, namely 1-bromine-8-nitro-3,6-naphthalene disulfonic acid. The environmental-friendly H-acid synthesis method is capable of reducing environment pollution and preventing such potential safety hazard, and thus an operation environment is relatively safe and environmentally friendly.

Process for separation of naphthalenedisulfonic acids

A process for separating 1,6-naphthalenedisulfonic acid, 2,6-naphthalenedisulfonic acid or 2,7-naphthalenedisulfonic acid selectively from reaction mixtures obtained by disulfonation of naphthalene under different reaction conditions is disclosed. For example, a particular disulfonation reaction of naphthalene is carried out which favors the formation of a particular isomer. This reaction mixture is diluted with water to adjust the sulfuric acid concentration to 35 to 90% by weight and the temperature is maintained at 0° to 80° C.; 1,6-naphthalene-disulfonic acid is selectively separated at high purity.