90830-37-8

Basic information

• Product Name: 4-nitronaphthalene-2,7-disulfonic acid
• Synonyms: 2,7-Naphthalenedisulfonic acid, 4-nitro-
• CAS NO: 90830-37-8
• Molecular Formula: C₁₀H₇NO₈S₂
• Molecular Weight: 333.2945
• Mol File: 90830-37-8.mol
• Article Data: 3

Chemical Properties

• Density: 1.841g/cm³
• Refractive Index: 1.714
• CAS DataBase Reference: 4-nitronaphthalene-2,7-disulfonic acid(CAS DataBase Reference)
• NIST Chemistry Reference: 4-nitronaphthalene-2,7-disulfonic acid(90830-37-8)
• EPA Substance Registry System: 4-nitronaphthalene-2,7-disulfonic acid(90830-37-8)

Safety Data

• Hazardous Substances Data: 90830-37-8(Hazardous Substances Data)

Upstream product

• 92-41-1 2,7-naphthalenedisulfonic acid 

Downstream Products

• 6251-07-6 4-amino-naphthalene-2,7-disulfonic acid 

Relevant articles and documents

Preparation method of 4-nitryl-2,7-naphthalene disulfonic acid

The invention discloses a preparation method of 4-nitryl-2,7-naphthalene disulfonic acid, which comprises the following steps: (1) 2,7-naphthalene disulfonic acid and organic acid are added into a reactor; (2) the temperature of the reactor is set as negative 15 to 120 DEG C, and the pressure of the reactor is set as atmospheric pressure to 35MPa; (3) an appropriate concentration of nitric acid isdripped into the reactor; (4) reaction is carried out for 3 to 12 hours under agitation; (5) separation and purification are performed, so that the 4-nitryl-2,7-naphthalene disulfonic acid is obtained. The reaction solvent of the method can be recycled, the yield is high, no waste water is produced, the defects in conventional synthesis methods that acid consumption is great and a great deal of waste water is discharged and is hard to treat are overcome, the cleanliness of reaction is increased, and environmental pollution is reduced.

Preparation method of dye intermediate 1-naphthol-3,6-disulfonic acid (RG acid)

The invention relates to the field of organic synthesis, and relates to a preparation method of a dye intermediate 1-naphthol-3,6-disulfonic acid (RG acid). According to the invention, an industrial product 2,7-naphthalene disulfonic acid is adopted as an initial material; and 1-naphthol-3,6-disulfonic acid (RG acid) with a single component and with purity reaching 98% or higher is obtained through three steps of reactions which are nitration, reduction and hydrolysis. During the preparation process provided by the invention, no waste gas and waste solid is emitted. Mother liquor produced through nitration and hydrolysis is subjected to a concentration treatment. Concentrate liquid and evaporated water can be returned to the reaction, and substantially no wastewater is discharged during the entire process. The process has the advantages of simple operation process, mild reaction conditions, and good product quality. The method provided by the invention is a novel route suitable for RG acid industrial production.