Basic information Safety Supplier Related

3-NITROBENZENESULFONIC ACID

Basic information Safety Supplier Related

3-NITROBENZENESULFONIC ACID Basic information

Product Name:
3-NITROBENZENESULFONIC ACID
Synonyms:
  • Kyselina 3-nitrobenzensulfonova
  • Kyselina nitrobenzen-m-sulfonova
  • kyselina3-nitrobenzensulfonova
  • kyselinanitrobenzen-m-sulfonova
  • m-nitro-benzenesulfonicaci
  • Benzene, 1-nitro-3-sulfonic acid
  • META-NITROBENZENESULPHONICACID
  • 3-NITROBENZENESULFONIC ACID HYDRATE
CAS:
98-47-5
MF:
C6H5NO5S
MW:
203.17
EINECS:
202-671-7
Mol File:
98-47-5.mol
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3-NITROBENZENESULFONIC ACID Chemical Properties

Melting point:
103-104℃
Density 
1.637
refractive index 
1.5380 (estimate)
Water Solubility 
Completely soluble in water
form 
solid
pka
-1.21±0.18(Predicted)
color 
White to Light yellow
CAS DataBase Reference
98-47-5(CAS DataBase Reference)
EPA Substance Registry System
Benzenesulfonic acid, 3-nitro- (98-47-5)
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Safety Information

Risk Statements 
34
Safety Statements 
26-36/37/39
RIDADR 
2305
RTECS 
DB7190000
HazardClass 
8
PackingGroup 
II
HS Code 
2904990090
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3-NITROBENZENESULFONIC ACID Usage And Synthesis

Chemical Properties

Crystals. Soluble in water and alcohol.

Uses

Organic synthesis. The sodium salt is a protective antireduction agent.

Uses

3-Nitrobenzenesulfonic acid is used primarily as a mild oxidizing agent or as a precursor for colorant intermediates. In the former case it is used in processing certain anthraquinone intermediates (e.g., amination of anthraquinone-1-sulfonic acid to give 1- aminoanthraquinone) or as a dye-printing auxiliary to obtain resist effects with, for example, vat dyes. Reduction of 3-nitrobenzenesulfonic acid (usually as a liquor) to the important metanilic acid is achieved with iron or by catalytic hydrogenation. The alternative reduction with zinc and alkali or with sodium amalgam yields hydrazobenzene-3,3'-disulfonic acid, which rearranges to benzidine-2,2' - disulfonic acid [117-61-3] on treatment with acid.

Production Methods

3-Nitrobenzenesulfonic acid is produced by dissolving nitrobenzene in 98 % sulfuric acid and heating to 80 ℃. Then 65 % oleum is added at this temperature, and the reaction is completed by heating for 9 h at 105 ℃ (higher temperatures are unsafe). After quenching the sulfonation mass in water, neutralizing with lime, and filtering off gypsum, the calcium salt of the product is converted to the sodium salt with sodium carbonate. After calcium carbonate has been removed by filtration, the sodium salt solution can be used directly or evaporated.

Safety Profile

A skin and severe eye irritant. Decomposes violently at about 200°. Mixture with sulfuric acid + sulfur trioxide may explode above 150°C. When heated to decomposition it emits toxic fumes of SOx and NOx. See also NITRO COMPOUNDS OF AROMATIC HYDROCARBONS and SULFONATES.

3-NITROBENZENESULFONIC ACID Preparation Products And Raw materials

Preparation Products

3-NITROBENZENESULFONIC ACIDSupplier