581-75-9

Basic information

• Product Name: Naphthalene-2,6-disulfonic acid
• Synonyms: Naphthalene-2,6-bissulfonic acid;2,6-NAPHTHALENE DISULFONIC ACID;Naphthalene-2,6-disulfonic acid;naphthalene-2,6-disulphonic acid
• CAS NO: 581-75-9
• Molecular Formula: C₁₀H₈O₆S₂
• Molecular Weight: 288.3
• EINECS: 209-471-9
• Product Categories: Intermediates of Dyes and Pigments
• Mol File: 581-75-9.mol
• Article Data: 5

Chemical Properties

• Appearance: white crystal
• Density: 1.704 g/cm³
• Refractive Index: 1.695
• Storage Temp.: 2-8°C
• PKA: -0.41±0.40(Predicted)
• CAS DataBase Reference: Naphthalene-2,6-disulfonic acid(CAS DataBase Reference)
• NIST Chemistry Reference: Naphthalene-2,6-disulfonic acid(581-75-9)
• EPA Substance Registry System: Naphthalene-2,6-disulfonic acid(581-75-9)

Safety Data

• RIDADR: 1759
• HazardClass: 8
• PackingGroup: III
• Hazardous Substances Data: 581-75-9(Hazardous Substances Data)

Usage

General Description

Naphthalene-2,6-disulfonic acid is a synthetic organic compound belonging to the family of naphthalene derivatives. It is produced through the sulfonation of naphthalene, resulting in two sulfonic acid groups attached to the naphthalene ring at the 2 and 6 positions. This chemical is commonly used in the manufacturing of dyes, pigments, and fluorescent agents due to its strong acidic and sulfonating properties. It is also used as a precursor in the production of various pharmaceuticals, agrochemicals, and in the formulation of industrial cleaners and detergents. Naphthalene-2,6-disulfonic acid is a versatile chemical with a wide range of applications in various industrial sectors.

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

Upstream product

• 91-20-3 naphthalene 
• 120-18-3 naphthalene-2-sulfonate 
• 92-41-1 2,7-naphthalenedisulfonic acid 
• 6362-04-5 3-Aminonaphthalene-2,6-disulfonic acid 
• 81-04-9 naphthalene-1,5-disulfonate 
• 7664-93-9 sulfuric acid 
• 7732-18-5 water 
• 525-37-1 naphthalene-1,6-disulfonic acid 
• 1655-45-4 disodium 2,6-naphthalenedisulfonate 

Downstream Products

• 92-41-1 2,7-naphthalenedisulfonic acid 
• 6654-67-7 naphthalene-1,3,5,7-tetrasulphonic acid 
• 581-43-1 2.6-dihydroxynaphthalene 
• 93-01-6 2-naphthol-6-sulfonic acid 
• 6483-80-3 4-hydroxy-naphthalene-2,6-disulfonic acid 
• 96892-95-4 2,6-naphthalene-dithiol 
• 13827-62-8 2,6-naphthalenedisulfonyl dichloride 
• 6362-05-6 1-amino-3,7-naphthalenedisulfonic acid 

Relevant articles and documents

Method of synthesizing, purifying and refining 2,6-naphthalene disulfonic acid

The invention discloses a method of synthesizing, purifying and refining 2,6-naphthalene disulfonic acid. The method comprises the following steps of 1) sulfonation and solventing-out: heating refinednaphthalene and concentrated sulfuric acid for sulphonation to produce 2,6-naphthalene disulfonic acid and 2,7-naphthalene disulfonic acid, and performing solventing-out with water and filtering to obtain a 2,6-naphthalene disulfonic acid filter cake and a 2,7-naphthalene disulfonic acid mother liquor; 2) washing: by taking ammonia water with the mass percentage being 0.08-0.20 percent or a 0.15-0.28 percent ammonium sulfate aqueous solution as a washing reagent, washing the 2,6-naphthalene disulfonic acid filter cake to obtain a 1-grade 2,6-naphthalene disulfonic acid filter cake and a 1-grade refined filtrate, performing circulation washing on the 2,6-naphthalene disulfonic acid filter cake for 2-4 times at this way to obtain a 2,6-naphthalene disulfonic acid product with the purity larger than 99 percent; and 3) washing solution indiscriminate application: enabling the 1-grade refined filtrate to return for indiscriminate application to a solventing-out procedure in the step 1) and/or a washing procedure in the step 2), and enabling the residual refined filtrate to return for indiscriminate application to the washing procedure in the step 2). The method provided by the invention realizes the purposes of acquiring high-quality 2,6-naphthalene disulfonic acid with separation, refining and purification, increasing the yield of 2,7-naphthalene disulfonic acid and lowering wastewater discharge.

A ph switchable pseudorotaxane based on a metal cage and a bis-anionic thread

Please let me in! A new kind of (pseudo)rotaxane is formed quantitatively when a bis-anionic thread is added to a molecular cage comprised of two positively charged metal complexes. The rotaxanation mechanism follows two alternative ways depending on the metal (Pd vs. Pt) and the stopper size of the guest (see figure).

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.