2-Amino-1,4-benzenedisulfonic acid

CAS NO.：98-44-2
Empirical Formula: C6H7NO6S2
Molecular Weight: 253.25
MDL number: MFCD00035753
EINECS: 202-669-6
SAFETY DATA SHEET (SDS)
Update Date: 2025-09-11 14:58:18

What is 2-Amino-1,4-benzenedisulfonic acid?

Chemical properties

off-white powder

The Uses of 2-Amino-1,4-benzenedisulfonic acid

Intermediate.

The Uses of 2-Amino-1,4-benzenedisulfonic acid

Aniline-2,5-disulfonic acid is used as pharmaceutical intermediate. 2-Amino-1,4-benzenedisulfonic acid is used as an intermediate for dyes; 2-Amino-1,4-benzenedisulfonic acid is converted to triazine derivatives, which are intermediates in the manufacture of dyes and optical brighteners.

Production Methods

2-Amino-1,4-benzenedisulfonic acid is obtained by sulfonating metanilic acid in 100% sulfuric acid with 50% oleum at 160 ℃ (5 – 6 h); the sulfonation mixture is diluted with water, lime is added, and the resulting calcium sulfate is removed; the product is then precipitated with excess concentrated hydrochloric acid in hot solution; yield 90 – 91%

Properties of 2-Amino-1,4-benzenedisulfonic acid

Melting point:	>300°C
Boiling point:	497.5℃[at 101 325 Pa]
Density	1.569 (estimate)
refractive index	1.5500 (estimate)
storage temp.	Keep in dark place,Inert atmosphere,Room temperature
solubility	Aqueous Acid (Slightly), Water (Slightly)
form	Solid
pka	-1.15±0.50(Predicted)
color	White to Off-White
Water Solubility	Slightly soluble in water.
CAS DataBase Reference	98-44-2(CAS DataBase Reference)
EPA Substance Registry System	2-Amino-1,4-benzenedisulfonic acid (98-44-2)

Safety information for 2-Amino-1,4-benzenedisulfonic acid

Signal word	Warning
Pictogram(s)	Exclamation Mark Irritant GHS07
GHS Hazard Statements	H315:Skin corrosion/irritation H319:Serious eye damage/eye irritation H335:Specific target organ toxicity, single exposure;Respiratory tract irritation
Precautionary Statement Codes	P261:Avoid breathing dust/fume/gas/mist/vapours/spray. P304+P340:IF INHALED: Remove victim to fresh air and Keep at rest in a position comfortable for breathing. P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing. P405:Store locked up.